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2010 Vol. 40, No. 9
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2010, 40(9): 1-4,10.
doi: 10.13204/j.gyjz201009001
Abstract:
Shougang Group has been moved out in recent years.It is an important problem that how to deal with the industrial buildings.According to the survey of the buildings in Shougang Industrial Area,the buildings were classified into three types,and it was put forward four methods of preservation and utilization: preserving as cultural relics,preserving facade,preserving structure and breaking down.In the end some suggestions were given on Shougang Industrial Area.
Shougang Group has been moved out in recent years.It is an important problem that how to deal with the industrial buildings.According to the survey of the buildings in Shougang Industrial Area,the buildings were classified into three types,and it was put forward four methods of preservation and utilization: preserving as cultural relics,preserving facade,preserving structure and breaking down.In the end some suggestions were given on Shougang Industrial Area.
2010, 40(9): 5-6,31.
doi: 10.13204/j.gyjz201009002
Abstract:
It was presenlted the beneficial search after the art design of landscape architecture group in a central business district(CBD) from planning and organization of the general plan,design of spatial landscape and modelling of integral facade,according to the analysis of the design scheme of landscape architecture group on Qiyuan Research Base.
It was presenlted the beneficial search after the art design of landscape architecture group in a central business district(CBD) from planning and organization of the general plan,design of spatial landscape and modelling of integral facade,according to the analysis of the design scheme of landscape architecture group on Qiyuan Research Base.
2010, 40(9): 7-10.
doi: 10.13204/j.gyjz201009003
Abstract:
The industry park planning has entered the period of toward ecological and harmonic development in China,but the study on interrelated planning theory and method still is in start-up periods. This text points out using principles of green urban design to assort the industry park with other parts of the city,and integrate the artificial construction system with natural ecosystem. This text provides a new clue of sustainable development to the industry park planning.
The industry park planning has entered the period of toward ecological and harmonic development in China,but the study on interrelated planning theory and method still is in start-up periods. This text points out using principles of green urban design to assort the industry park with other parts of the city,and integrate the artificial construction system with natural ecosystem. This text provides a new clue of sustainable development to the industry park planning.
2010, 40(9): 11-13,16.
doi: 10.13204/j.gyjz201009004
Abstract:
Industrial buildings,as a part of an urban component,have been treated as the edge area in the architectural design area for a long time. The traditional culture is input to soften the edge of people and machine, thus bringing humanistic care to the workers inside the factories as the design method of contemporary industrial parks,whick not only is a design cocept,but also desire of a harmony society as well.
Industrial buildings,as a part of an urban component,have been treated as the edge area in the architectural design area for a long time. The traditional culture is input to soften the edge of people and machine, thus bringing humanistic care to the workers inside the factories as the design method of contemporary industrial parks,whick not only is a design cocept,but also desire of a harmony society as well.
2010, 40(9): 14-16.
doi: 10.13204/j.gyjz201009005
Abstract:
It is introduced some specific measures to carry out the design concept of sustainable development in the engineering design of Zhengzhou 110kV Yaozhai Substation Project and Moving Jinghan Microwave Station Project from several aspect of optimizing general arrangement drawing, building energy-saving, design of protecting environment,using of solar resource and harmonious environment etc. Which provides basic data on research and forming criterion of green industrial construction.
It is introduced some specific measures to carry out the design concept of sustainable development in the engineering design of Zhengzhou 110kV Yaozhai Substation Project and Moving Jinghan Microwave Station Project from several aspect of optimizing general arrangement drawing, building energy-saving, design of protecting environment,using of solar resource and harmonious environment etc. Which provides basic data on research and forming criterion of green industrial construction.
2010, 40(9): 17-19.
doi: 10.13204/j.gyjz201009006
Abstract:
This thesis briefly introduces architectural features of industrial workshops,and points out the trend of diversified design style for modern industrial workshops.On the basis of the authors engineering experience,this thesis further discusses the combination method of annexes of industrial workshops and how to apply the design techniques to the annex design.
This thesis briefly introduces architectural features of industrial workshops,and points out the trend of diversified design style for modern industrial workshops.On the basis of the authors engineering experience,this thesis further discusses the combination method of annexes of industrial workshops and how to apply the design techniques to the annex design.
2010, 40(9): 20-22,47.
doi: 10.13204/j.gyjz201009007
Abstract:
This article analyses the characteristics and landscape attribute of industrial facilities and furthermore it explains the landscape value of industrial facilities from the two aspects of aesthetic value and social value. This article widens designing train of thought and improves designing ability by investigating the landscape value of industrial facilities.
This article analyses the characteristics and landscape attribute of industrial facilities and furthermore it explains the landscape value of industrial facilities from the two aspects of aesthetic value and social value. This article widens designing train of thought and improves designing ability by investigating the landscape value of industrial facilities.
2010, 40(9): 23-25,19.
doi: 10.13204/j.gyjz201009008
Abstract:
In our country,industrial parks acting as the growing pole of regional economic development bring cities good economic benefit,and even are regional symbol projects. However,it is because of environmental pollution,the lack of public services and few compromise between enterprises etc. in many industrial parks,which results in the descent of environmental quality and the fall of presence,all the reasons above restrain a sustainable development of industrial parks. This thesis puts forward effective ways of vitality creation of SME parks by analyzing the planning of SME parks in Handan City. Which brings reference to the healthy,high-efficient and orderly advance of industrial parks to some extent.
In our country,industrial parks acting as the growing pole of regional economic development bring cities good economic benefit,and even are regional symbol projects. However,it is because of environmental pollution,the lack of public services and few compromise between enterprises etc. in many industrial parks,which results in the descent of environmental quality and the fall of presence,all the reasons above restrain a sustainable development of industrial parks. This thesis puts forward effective ways of vitality creation of SME parks by analyzing the planning of SME parks in Handan City. Which brings reference to the healthy,high-efficient and orderly advance of industrial parks to some extent.
2010, 40(9): 26-27,36.
doi: 10.13204/j.gyjz201009009
Abstract:
In the case where the building orientation and the land surrounding have not sufficient connections,how to plan and organize the environment and space orderly in order to meet the requirements of manufacturing? How to make a large number of plants buildings to have rich architectural styles and also meet the requirement of manufacturing process at the same time? This article tries to explore these two topics by forming an axis of an ordered series of objects in space,and aligning construction sidelines with land sidelines,coordinating surrounding environment,and breaking down the size relation of complex building.
In the case where the building orientation and the land surrounding have not sufficient connections,how to plan and organize the environment and space orderly in order to meet the requirements of manufacturing? How to make a large number of plants buildings to have rich architectural styles and also meet the requirement of manufacturing process at the same time? This article tries to explore these two topics by forming an axis of an ordered series of objects in space,and aligning construction sidelines with land sidelines,coordinating surrounding environment,and breaking down the size relation of complex building.
2010, 40(9): 32-36.
doi: 10.13204/j.gyjz201009011
Abstract:
Quasi-static test of three reinforced concrete shear walls are carried out under low cyclic repeated loading. The relationship between force and displacement is obtained. Through comparing the destructed behaviors and grades of the walls under different shear span ratio based on the analysis of test and hysteretic curve,it can be concluded that for the walls of shear failure,the stiffness and carrying capacity quickly fall when the stiffness and load are not degenerate sharply in the displacement control loading stage,which should be avoided in engineering design; for the wall of flexural failure with good ductibility and energy dissipative capability,the stiffness and carrying capacity fall slowly,which should be adopted in engineering design. For the choice of hysteresis loop model,three-linear model of sloping stiffness degradation or two-linear model of sloping stiffness degradation is suggested for the smaller shear-span ratio,and three-linear model of even stiffness degradation is suggested for the larger shear-span ratio.
Quasi-static test of three reinforced concrete shear walls are carried out under low cyclic repeated loading. The relationship between force and displacement is obtained. Through comparing the destructed behaviors and grades of the walls under different shear span ratio based on the analysis of test and hysteretic curve,it can be concluded that for the walls of shear failure,the stiffness and carrying capacity quickly fall when the stiffness and load are not degenerate sharply in the displacement control loading stage,which should be avoided in engineering design; for the wall of flexural failure with good ductibility and energy dissipative capability,the stiffness and carrying capacity fall slowly,which should be adopted in engineering design. For the choice of hysteresis loop model,three-linear model of sloping stiffness degradation or two-linear model of sloping stiffness degradation is suggested for the smaller shear-span ratio,and three-linear model of even stiffness degradation is suggested for the larger shear-span ratio.
2010, 40(9): 37-40.
doi: 10.13204/j.gyjz201009012
Abstract:
the new type slit hollow shear wall of reinforced concrete is a carrying structure of anti-seismic and energy conservation.Through the experiment of three shear wall components,it was analyzed the failure mode,failure mechanism and deformation feature of the new structure.The result shows that the slit hollow shear wall has ductile flexural-shear failure mode,whose aseismic behavion is better than that of the normal shear wall.
the new type slit hollow shear wall of reinforced concrete is a carrying structure of anti-seismic and energy conservation.Through the experiment of three shear wall components,it was analyzed the failure mode,failure mechanism and deformation feature of the new structure.The result shows that the slit hollow shear wall has ductile flexural-shear failure mode,whose aseismic behavion is better than that of the normal shear wall.
2010, 40(9): 41-47.
doi: 10.13204/j.gyjz201009013
Abstract:
Stiffening ribbed hollow pipe cast-in-place reinforced concrete girderless floor is a new style hollow girderless floor system. Model experimental research on simply-supported floor has been done on this new kind of floor system. The experiment results show that the floor system has the mechanical property of high bearing capacity,big rigidity and good tensility. A theoretical method is presented that the stiffening ribbed hollow pipe girderless floor can be analyzed by converting it equivalently to orthotropic solid slab. It is indicated that the method is correct and reasonable according to the contrast of theoretical calculated results and experimental measured results. The theoretical results coincide with the measured results well.
Stiffening ribbed hollow pipe cast-in-place reinforced concrete girderless floor is a new style hollow girderless floor system. Model experimental research on simply-supported floor has been done on this new kind of floor system. The experiment results show that the floor system has the mechanical property of high bearing capacity,big rigidity and good tensility. A theoretical method is presented that the stiffening ribbed hollow pipe girderless floor can be analyzed by converting it equivalently to orthotropic solid slab. It is indicated that the method is correct and reasonable according to the contrast of theoretical calculated results and experimental measured results. The theoretical results coincide with the measured results well.
2010, 40(9): 48-52.
doi: 10.13204/j.gyjz201009014
Abstract:
Low cyclic loading tests were carried out for six SRC column-RC beam hybrid joints to investigate the effect of strength ratio of joint to beam j on the failure modes of specimens.The longitudinal reinforcement ratio of beam and stirrup ratio of joint area were adjusted to create different strength ratio of joint to beam and three different failure modes of specimens were achieved,which are flexural failure of beam,shear failure of joint and combination of both.Based on the experimental research,the hysteretic curves,skeleton curves and deformation behavior of specimens were studied.It is indicated that the strength ratio of joint to beam has great effect on the failure mode of specimens.When j of the specimen is less than 1.1,shear failure of joint area takes place,which should be avoided through proper design.SRC column-RC beam joints have better seismic performance than RC joints after shear failure of joint area because of the confinement of column steel,which is continuum through the joint area,to the concrete of joint core.Finally,a series of drift limit for the four different seismic performance levels were recommended.
Low cyclic loading tests were carried out for six SRC column-RC beam hybrid joints to investigate the effect of strength ratio of joint to beam j on the failure modes of specimens.The longitudinal reinforcement ratio of beam and stirrup ratio of joint area were adjusted to create different strength ratio of joint to beam and three different failure modes of specimens were achieved,which are flexural failure of beam,shear failure of joint and combination of both.Based on the experimental research,the hysteretic curves,skeleton curves and deformation behavior of specimens were studied.It is indicated that the strength ratio of joint to beam has great effect on the failure mode of specimens.When j of the specimen is less than 1.1,shear failure of joint area takes place,which should be avoided through proper design.SRC column-RC beam joints have better seismic performance than RC joints after shear failure of joint area because of the confinement of column steel,which is continuum through the joint area,to the concrete of joint core.Finally,a series of drift limit for the four different seismic performance levels were recommended.
2010, 40(9): 53-57.
doi: 10.13204/j.gyjz201009015
Abstract:
Ten specimens of reinforced concrete interior joints with different depth beams were tested under reversed cyclic loading. The experimental study was conducted that focused on the failure characteristics and layer deformation capacity of beam column subassemblage. Results indicated that the critical crack load was quite nearly with the ultimate load of interior joints and the seismic behavior was poorer than that of ordinary joints,and the shear failures of all the specimens appeared in the large core under external loads,which can not meet the design requirement of a rigid joint. Furthermore,the layer deformation capacity analysis indicated that the deformation capacity of interior joint can satisfy the deformation demand in the elastic stage. However,the deformation capacity can not satisfy the deformation demand in the elastic-plastic stage based on the critical crack stage design. Thus,a security reserve coefficient was suggested in the seismic design of joints for RC structures to preserve the structural integrity.
Ten specimens of reinforced concrete interior joints with different depth beams were tested under reversed cyclic loading. The experimental study was conducted that focused on the failure characteristics and layer deformation capacity of beam column subassemblage. Results indicated that the critical crack load was quite nearly with the ultimate load of interior joints and the seismic behavior was poorer than that of ordinary joints,and the shear failures of all the specimens appeared in the large core under external loads,which can not meet the design requirement of a rigid joint. Furthermore,the layer deformation capacity analysis indicated that the deformation capacity of interior joint can satisfy the deformation demand in the elastic stage. However,the deformation capacity can not satisfy the deformation demand in the elastic-plastic stage based on the critical crack stage design. Thus,a security reserve coefficient was suggested in the seismic design of joints for RC structures to preserve the structural integrity.
2010, 40(9): 58-65,57.
doi: 10.13204/j.gyjz201009016
Abstract:
The theory lags far behind the engineering practice,though the composite ground under flexible foundation has been widely applied to several engineering fields,such as embankments of highway and railway,dams,tailing dams,stack yards.Combined with the present situation analysis of analytical method,the settlement characteristics of the composite ground under flexible foundation was summarized firstly.Then,a simplified analytical solution was presented briefly.The fellowing verification by an engineering case indicates that the solution can more accurately reflect the working behavior of the composite ground under a flexible foundation.And then,on a basis of a standard example,the relationships among eight influence factors and the height of the equal settlement plane,the depth of the neutral point,the stab deformation,the settlement of pile and soil etc.were studied through the solution.It can be concluded that the factors of the four components of the system can all affect the settlement characteristics more or less.It is necessary to pay more attention to the composite ground under flexible foundation based on super-sub structure interaction.
The theory lags far behind the engineering practice,though the composite ground under flexible foundation has been widely applied to several engineering fields,such as embankments of highway and railway,dams,tailing dams,stack yards.Combined with the present situation analysis of analytical method,the settlement characteristics of the composite ground under flexible foundation was summarized firstly.Then,a simplified analytical solution was presented briefly.The fellowing verification by an engineering case indicates that the solution can more accurately reflect the working behavior of the composite ground under a flexible foundation.And then,on a basis of a standard example,the relationships among eight influence factors and the height of the equal settlement plane,the depth of the neutral point,the stab deformation,the settlement of pile and soil etc.were studied through the solution.It can be concluded that the factors of the four components of the system can all affect the settlement characteristics more or less.It is necessary to pay more attention to the composite ground under flexible foundation based on super-sub structure interaction.
2010, 40(9): 66-69,104.
doi: 10.13204/j.gyjz201009017
Abstract:
The in-situ loading test was performed and the experimental data were used to verify the computational results from the finite element methods,which showed that the finite element program was reliable.By virtue of numerical analysis,the failure process can be reproduced.It is found that the plastic strains firstly appear on the junctions of cement mixing piles by horizontal jet grouting.With increasing of the load,the plastic zone expands and joints together at last.
The in-situ loading test was performed and the experimental data were used to verify the computational results from the finite element methods,which showed that the finite element program was reliable.By virtue of numerical analysis,the failure process can be reproduced.It is found that the plastic strains firstly appear on the junctions of cement mixing piles by horizontal jet grouting.With increasing of the load,the plastic zone expands and joints together at last.
2010, 40(9): 70-72.
doi: 10.13204/j.gyjz201009018
Abstract:
According to the comparison of the flat dilatometer test results to those of laboratory test and through trial calculation,it was given empirical formula of applying flat dilatometer test to determine the coefficient of earth pressure at rest in Xian loess foundation. The calculated results agreed basically with those of basically laboratory test,whose errors are between 2% to 5%.
According to the comparison of the flat dilatometer test results to those of laboratory test and through trial calculation,it was given empirical formula of applying flat dilatometer test to determine the coefficient of earth pressure at rest in Xian loess foundation. The calculated results agreed basically with those of basically laboratory test,whose errors are between 2% to 5%.
2010, 40(9): 73-76,87.
doi: 10.13204/j.gyjz201009019
Abstract:
It was the first time to use Bayers dry-type storage of red mud in the yard-type flat at home by Guangxi Aluminum Company,which caused the problem of cracks to some extent through on-site spot survey of No. 2 pool by geological compass,theodolite,leather measuring tape,ten major cracks occurred in No. 2 pool,whose trend was east-west roughly,the major cracks were located from northern to central part of the yard,and many small cracks were distributed around the major crack by netshape as well as rimous pattern . It was concluded that the cracks in the yard were produced by different sequences of red mud emissions,shrinkage of red mud slurry,difference in pressure and solution of soluble salts.
It was the first time to use Bayers dry-type storage of red mud in the yard-type flat at home by Guangxi Aluminum Company,which caused the problem of cracks to some extent through on-site spot survey of No. 2 pool by geological compass,theodolite,leather measuring tape,ten major cracks occurred in No. 2 pool,whose trend was east-west roughly,the major cracks were located from northern to central part of the yard,and many small cracks were distributed around the major crack by netshape as well as rimous pattern . It was concluded that the cracks in the yard were produced by different sequences of red mud emissions,shrinkage of red mud slurry,difference in pressure and solution of soluble salts.
2010, 40(9): 77-79.
doi: 10.13204/j.gyjz201009020
Abstract:
Two kinds of fibers i. e. steel fiber with high elastic modulus and polypropylene fiber with low elastic modulus,have been added to the reactive powder concrete(RPC) in order to improve its mchanical properties. In this paper,it is studied the impact of the change in the two fibers content on compressive strength and flexural strength of hybrid fiber reinforced PRC. The results indicate that the mechanical properties of the hybrid fiber reinforced RPC can be improved to some extent.
Two kinds of fibers i. e. steel fiber with high elastic modulus and polypropylene fiber with low elastic modulus,have been added to the reactive powder concrete(RPC) in order to improve its mchanical properties. In this paper,it is studied the impact of the change in the two fibers content on compressive strength and flexural strength of hybrid fiber reinforced PRC. The results indicate that the mechanical properties of the hybrid fiber reinforced RPC can be improved to some extent.
2010, 40(9): 80-83.
doi: 10.13204/j.gyjz201009021
Abstract:
The corrosion of reinforcing bar induced by chloride ion is the main reason for the properties degradation of concrete structures under the chloride erosion environment,at present,the study on chloride ion diffusion properties almost takes free chloride ion as the object,the diffusion properties of total chloride ion in concrete has rarely been studied. The diffusion properties of free chloride ion and total chloride ion in concrete were further studied by natural diffusion method in this paper,the effect of water-binder ratio on chloride ion diffusion properties was investigated,the time-dependence of chloride ion diffusion coefficient was taken into consideration,the relationship between the effective chloride ion diffusion coefficient and the apparent chloride ion diffusion coefficient was established,which has laid a foundation for more scientific durability life prediction of concrete structures under the chloride erosion environment.
The corrosion of reinforcing bar induced by chloride ion is the main reason for the properties degradation of concrete structures under the chloride erosion environment,at present,the study on chloride ion diffusion properties almost takes free chloride ion as the object,the diffusion properties of total chloride ion in concrete has rarely been studied. The diffusion properties of free chloride ion and total chloride ion in concrete were further studied by natural diffusion method in this paper,the effect of water-binder ratio on chloride ion diffusion properties was investigated,the time-dependence of chloride ion diffusion coefficient was taken into consideration,the relationship between the effective chloride ion diffusion coefficient and the apparent chloride ion diffusion coefficient was established,which has laid a foundation for more scientific durability life prediction of concrete structures under the chloride erosion environment.
2010, 40(9): 84-87.
doi: 10.13204/j.gyjz201009022
Abstract:
Based on 45 HRB high-strength steel bar specimens pull-out tests after high temperature,it is studied that the bond-anchorage properties of high-strength steel bars and the main factors influencing the bond capacity between high-strength steel bars and concrete. During the experiments,the reinforced concrete specimens were heated at 200, 400 and 600 ℃,respectively,cooled in air and subjected to monotonic pull-out loading. The influencing regulations of some factors on the bond-anchorage properties of high-strength steel bars are investigated,such as concrete strength,yield strength of reinforcing bar,stirrup ratio. At the same time,the paper clarifies that the major bondanchorage mechanism of high-strength steel bars after high temperature is similar to that of the general reinforcement.
Based on 45 HRB high-strength steel bar specimens pull-out tests after high temperature,it is studied that the bond-anchorage properties of high-strength steel bars and the main factors influencing the bond capacity between high-strength steel bars and concrete. During the experiments,the reinforced concrete specimens were heated at 200, 400 and 600 ℃,respectively,cooled in air and subjected to monotonic pull-out loading. The influencing regulations of some factors on the bond-anchorage properties of high-strength steel bars are investigated,such as concrete strength,yield strength of reinforcing bar,stirrup ratio. At the same time,the paper clarifies that the major bondanchorage mechanism of high-strength steel bars after high temperature is similar to that of the general reinforcement.
2010, 40(9): 88-81,96.
doi: 10.13204/j.gyjz201009023
Abstract:
The parameters influencing the shear strength of reinforced concrete beams are various,the test data used to study the effect of longitudinal reinforcement ratio alone on shear strength of the beams is inadequate and biased although the whole database is large.With the data filtering algorithm the comprehensive shear strength test data from current literatures of reinforced concrete rectangular section beams without stirrups under concentrated load are filtered,and then the influence of data missing,bias and other parameters is minimized.So the law of the effect of longitudinal reinforcement ratio on the beam shear strength is derived,and with consideration of the effect of longitudinal reinforcement ratio the shear strength formula of reinforced concrete beams without stirrups is presented.
The parameters influencing the shear strength of reinforced concrete beams are various,the test data used to study the effect of longitudinal reinforcement ratio alone on shear strength of the beams is inadequate and biased although the whole database is large.With the data filtering algorithm the comprehensive shear strength test data from current literatures of reinforced concrete rectangular section beams without stirrups under concentrated load are filtered,and then the influence of data missing,bias and other parameters is minimized.So the law of the effect of longitudinal reinforcement ratio on the beam shear strength is derived,and with consideration of the effect of longitudinal reinforcement ratio the shear strength formula of reinforced concrete beams without stirrups is presented.
2010, 40(9): 92-96.
doi: 10.13204/j.gyjz201009024
Abstract:
It is very important for the variation of internal forces of supporting structure during the excavation process of underground space. In this paper,modeling the excavation process of Beigongmen Subway Station was done with the calculation software FLAC2D,and after analysis the following conclusions were made: the axial force in the top and the bottom slabs was related with the displacement in soil near the slabs; the shear and the moment figures were similar to both of the simply-supported beam,and their values were concerned with the absolute displacement in soil near the slabs. Hence the stress concentration occured at the corner of the supporting structures; and the excavation method and the design of supporting structures were adaptive to the loads from the surrounding soil.
It is very important for the variation of internal forces of supporting structure during the excavation process of underground space. In this paper,modeling the excavation process of Beigongmen Subway Station was done with the calculation software FLAC2D,and after analysis the following conclusions were made: the axial force in the top and the bottom slabs was related with the displacement in soil near the slabs; the shear and the moment figures were similar to both of the simply-supported beam,and their values were concerned with the absolute displacement in soil near the slabs. Hence the stress concentration occured at the corner of the supporting structures; and the excavation method and the design of supporting structures were adaptive to the loads from the surrounding soil.
2010, 40(9): 97-100.
doi: 10.13204/j.gyjz201009025
Abstract:
The supporting design,construction and monitoring scheme of a supper larger deep excavation in Jiangsu are introduced. Information construction technique is adopted for strict protection requirement of the surroundings, and full and all course monitoring is done during the process of excavation construction. Analysis of the monitoring data shows that the supporting scheme design of the excavation is successful.
The supporting design,construction and monitoring scheme of a supper larger deep excavation in Jiangsu are introduced. Information construction technique is adopted for strict protection requirement of the surroundings, and full and all course monitoring is done during the process of excavation construction. Analysis of the monitoring data shows that the supporting scheme design of the excavation is successful.
2010, 40(9): 101-104.
doi: 10.13204/j.gyjz201009026
Abstract:
The undergrand pool is deep foundation pit in the sewage treatment station and heat exchange station in new developed area of Handan Steel Iron Co.Ltd,the excavation is 13.7 m and 13.5 m deep respectivly.the excavation has rich groundwater and with claypan at upper part and sand gravel stratum at lower part.According to the real engineering situation,the combined supporting technology is adoped with soil nailing wall at upper part and retaining piles at lower part,the technology makes full use of the soil nailing wall support at upper shallow position and retaining piles at lower deep position,the technology is safe,reliable,economical and practical.It is worth popularizing in deep excavations.
The undergrand pool is deep foundation pit in the sewage treatment station and heat exchange station in new developed area of Handan Steel Iron Co.Ltd,the excavation is 13.7 m and 13.5 m deep respectivly.the excavation has rich groundwater and with claypan at upper part and sand gravel stratum at lower part.According to the real engineering situation,the combined supporting technology is adoped with soil nailing wall at upper part and retaining piles at lower part,the technology makes full use of the soil nailing wall support at upper shallow position and retaining piles at lower deep position,the technology is safe,reliable,economical and practical.It is worth popularizing in deep excavations.
2010, 40(9): 105-109,110.
doi: 10.13204/j.gyjz201009027
Abstract:
Welded tubular joints are often used as the main structural components in road and railway infrastructure, offshore platforms and supporting frames of wind turbines,where fatigue is a major concern. Cast-steel joints become an attractive solution to fatigue problems in tubular trusses. The fatigue behaviour of welded cast steel to hot-rolled tubes is the key research focus. This paper provides a summary of the application of welded cast steel joints,the material properties of cast steel and recent development in fatigue behaviour of welded cast steel joint. Future directions are pointed out for this research field in order to promote the application and design of such innovative joints in China.
Welded tubular joints are often used as the main structural components in road and railway infrastructure, offshore platforms and supporting frames of wind turbines,where fatigue is a major concern. Cast-steel joints become an attractive solution to fatigue problems in tubular trusses. The fatigue behaviour of welded cast steel to hot-rolled tubes is the key research focus. This paper provides a summary of the application of welded cast steel joints,the material properties of cast steel and recent development in fatigue behaviour of welded cast steel joint. Future directions are pointed out for this research field in order to promote the application and design of such innovative joints in China.
2010, 40(9): 111-114,110.
doi: 10.13204/j.gyjz201009028
Abstract:
Based on experiment of two pieces of frames with SRC columns and steel beam umder low-reversed cyclic loading,hysteresis behavior,ductility,energy dissipation and rigidity degeneration are studied. The ultimate loading capacity of the composite frame is calculated,by the provisions in JGJ 1382001 Technical Specification for Steel Reinforced Concrete Composite Structures and YB 90822006 Technical Specification of Steel-Reinforced Concrete Structures. The study results show that the frame with SRC columns and steel beam has better seismic performance and accurate results can be got by the methods of the two specifications.
Based on experiment of two pieces of frames with SRC columns and steel beam umder low-reversed cyclic loading,hysteresis behavior,ductility,energy dissipation and rigidity degeneration are studied. The ultimate loading capacity of the composite frame is calculated,by the provisions in JGJ 1382001 Technical Specification for Steel Reinforced Concrete Composite Structures and YB 90822006 Technical Specification of Steel-Reinforced Concrete Structures. The study results show that the frame with SRC columns and steel beam has better seismic performance and accurate results can be got by the methods of the two specifications.
2010, 40(9): 115-119,124.
doi: 10.13204/j.gyjz201009029
Abstract:
Two single-span portal frames were designed to make statical test.The loads were two kinds of combinations:1.20 permanent load + 1.40 variable load,1.20 permanent load + 1.40 variable load + 1.40 0.60 wind load.The internal force and displacement in key points were analyzed.The results indicated that the portal frames could meet the design requirements.FEM software ANSYS was adopted to established a non-linear analysis model,in which the Shell 181 element was chosen.The FEM analytical results agreed well with those of the experiment.After the validity of finite element analysis was proved,the load combination of permanent load and variable load was applied and increased step by step till the failure of frame.Then the failure mode and mechanism were analyzed.
Two single-span portal frames were designed to make statical test.The loads were two kinds of combinations:1.20 permanent load + 1.40 variable load,1.20 permanent load + 1.40 variable load + 1.40 0.60 wind load.The internal force and displacement in key points were analyzed.The results indicated that the portal frames could meet the design requirements.FEM software ANSYS was adopted to established a non-linear analysis model,in which the Shell 181 element was chosen.The FEM analytical results agreed well with those of the experiment.After the validity of finite element analysis was proved,the load combination of permanent load and variable load was applied and increased step by step till the failure of frame.Then the failure mode and mechanism were analyzed.
2010, 40(9): 120-124.
doi: 10.13204/j.gyjz201009030
Abstract:
Based on the test of flexural behavior of CS sandwich panels ( CSSPs),this paper mainly studies the effects of fabric reinforcement on the flexural and the crack resistance behavior of CS sandwich panels. The experiments show that CSSPs have excellent flexural and crack behavior. According to the analysis of flexural mechanism,the equations of computing cracking moment and ultimate moment of CSSPs have been proposed and the computation results match well with the experimental ones.
Based on the test of flexural behavior of CS sandwich panels ( CSSPs),this paper mainly studies the effects of fabric reinforcement on the flexural and the crack resistance behavior of CS sandwich panels. The experiments show that CSSPs have excellent flexural and crack behavior. According to the analysis of flexural mechanism,the equations of computing cracking moment and ultimate moment of CSSPs have been proposed and the computation results match well with the experimental ones.
2010, 40(9): 125-127.
doi: 10.13204/j.gyjz201009031
Abstract:
The engineering geological conditions and environment of a deep excavation in Xining is very complicated.Based on the elementary theory and interrelated codes of deep excavations,a demonstration is carried out for the enclosure scheme,the anchor bar and piles in row are used for the enclosure,the arrangement of the enclosure and calculation are also completed.The stability of withstanding tipping and uplift resistance are checked.Practice has shown the design scheme is safe and reliable,which provides a reference for similar projects.
The engineering geological conditions and environment of a deep excavation in Xining is very complicated.Based on the elementary theory and interrelated codes of deep excavations,a demonstration is carried out for the enclosure scheme,the anchor bar and piles in row are used for the enclosure,the arrangement of the enclosure and calculation are also completed.The stability of withstanding tipping and uplift resistance are checked.Practice has shown the design scheme is safe and reliable,which provides a reference for similar projects.
