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2005 Vol. 35, No. 1
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2005, 35(1): 5-7.
doi: 10.13204/j.gyjz200501001
Abstract:
Based on taking corrosion test of concrete immersed in 3.5% weight of NaCl,5% weight of Na2SO4 and compound solutions(3.5% NaCl+5%Na2SO4),it has been studied that the free chloride di ffusion and mechanical damage,based on relative Youngs modulus,of concrete tha t include two grades of strength and three types of mineral admixture.The results suggest that the free chloride content of C30 should be 2 times that of C50,and fr ee chloride diffusion coefficients be 1.7～1.95 times.Moreover,the mineral adm ixtures may improve chloride and sulfate ion resistance capacity of conc rete,and the sulfate decreases chloride resistance capacity of concrete,as well as the chloride decreases the sulfates damage speed of concrete.
Based on taking corrosion test of concrete immersed in 3.5% weight of NaCl,5% weight of Na2SO4 and compound solutions(3.5% NaCl+5%Na2SO4),it has been studied that the free chloride di ffusion and mechanical damage,based on relative Youngs modulus,of concrete tha t include two grades of strength and three types of mineral admixture.The results suggest that the free chloride content of C30 should be 2 times that of C50,and fr ee chloride diffusion coefficients be 1.7～1.95 times.Moreover,the mineral adm ixtures may improve chloride and sulfate ion resistance capacity of conc rete,and the sulfate decreases chloride resistance capacity of concrete,as well as the chloride decreases the sulfates damage speed of concrete.
2005, 35(1): 8-10,14.
doi: 10.13204/j.gyjz200501002
Abstract:
The effects of hybrid fiber on hi gh performance concrete properties under high temperature were studied.The exper iment applies hybrid fiber with low(polypropylene fiber)and high melting point(s teel fiber)to improve mechanical properties and bursting resistance of high perf ormance concrete,since high performance concrete easily spalls and destroys afte r being on fire.The results show that flexural strength residual rate of hybrid fiber reinforced concrete(about 15%)is higher than that of normal concrete(about 6%);compressive strength residual rate of hybrid fiber reinforced concrete(abou t 15%)is approximate to that of normal concrete(about 15%);splitting tensile str ength residual rate of hybrid fiber reinforced concrete(about 20%) is higher tha n that of normal concrete(about 10%).Hybrid fiber has significant improvement on spalling resistance of concrete,and the active mechanism of hybrid fiber improv ement on high performance concrete is also analyzed.
The effects of hybrid fiber on hi gh performance concrete properties under high temperature were studied.The exper iment applies hybrid fiber with low(polypropylene fiber)and high melting point(s teel fiber)to improve mechanical properties and bursting resistance of high perf ormance concrete,since high performance concrete easily spalls and destroys afte r being on fire.The results show that flexural strength residual rate of hybrid fiber reinforced concrete(about 15%)is higher than that of normal concrete(about 6%);compressive strength residual rate of hybrid fiber reinforced concrete(abou t 15%)is approximate to that of normal concrete(about 15%);splitting tensile str ength residual rate of hybrid fiber reinforced concrete(about 20%) is higher tha n that of normal concrete(about 10%).Hybrid fiber has significant improvement on spalling resistance of concrete,and the active mechanism of hybrid fiber improv ement on high performance concrete is also analyzed.
2005, 35(1): 11-14.
doi: 10.13204/j.gyjz200501003
Abstract:
Research work into freeze resista nce theory and service life prediction model for freezing and thawing cycle of h igh strength concrete are summarized and the corresponding research aimed to est ablish a new mathematics model of freeze-thaw durability for service life predi ct ion based on experimental results has been done.Two new mathematics models based on freeze-thaw cumulation damage theory are put forward and it is revealed tha t the new mathematical model especially the power function one is superior to th e traditional attenuation model of relative dynamic elasticity module of concret e in precision according to the freeze-thaw cycle test data.The quantitative an alysis on the influence of nano SiO-2(3%)and super retarder(0.3%)to service li fe of freeze-thaw cycle of high strength concrete is provided by using this mod el.
Research work into freeze resista nce theory and service life prediction model for freezing and thawing cycle of h igh strength concrete are summarized and the corresponding research aimed to est ablish a new mathematics model of freeze-thaw durability for service life predi ct ion based on experimental results has been done.Two new mathematics models based on freeze-thaw cumulation damage theory are put forward and it is revealed tha t the new mathematical model especially the power function one is superior to th e traditional attenuation model of relative dynamic elasticity module of concret e in precision according to the freeze-thaw cycle test data.The quantitative an alysis on the influence of nano SiO-2(3%)and super retarder(0.3%)to service li fe of freeze-thaw cycle of high strength concrete is provided by using this mod el.
2005, 35(1): 15-17.
doi: 10.13204/j.gyjz200501004
Abstract:
The previous study on high streng th concrete often only devoted to improvement on strength in laboratory.On one hand there does exist strength size effect,on the other hand the brittleness is increased with an increase in strength of concrete,and the phenomenon more pr evalently.So the availability of these studies became suspect.In this paper,base d on size effect law suggested by Bazant,the high strength and super high streng th concrete is studied.It is shown that with the improvement of strength of conc rete the trend that strength of concrete decreases quickly with scale increasing is more pronounced.Furthermore meaning of the study connecting brittleness with size effect is discussed.
The previous study on high streng th concrete often only devoted to improvement on strength in laboratory.On one hand there does exist strength size effect,on the other hand the brittleness is increased with an increase in strength of concrete,and the phenomenon more pr evalently.So the availability of these studies became suspect.In this paper,base d on size effect law suggested by Bazant,the high strength and super high streng th concrete is studied.It is shown that with the improvement of strength of conc rete the trend that strength of concrete decreases quickly with scale increasing is more pronounced.Furthermore meaning of the study connecting brittleness with size effect is discussed.
2005, 35(1): 18-20.
doi: 10.13204/j.gyjz200501005
Abstract:
In this paper,the authors analyze the character of the reactive powdered concrete.Using the ordinary materials a n d conventional technology,150～200MPa super high performance concrete with a slu mp245mm,spread563mm and 28d compressive strength170.3MPa has been success fully developed.Then the optimal economical technology for preparing super high performance concrete is using a coarse aggregate,whose key point is how to sett le the problem due to the course aggregate.
In this paper,the authors analyze the character of the reactive powdered concrete.Using the ordinary materials a n d conventional technology,150～200MPa super high performance concrete with a slu mp245mm,spread563mm and 28d compressive strength170.3MPa has been success fully developed.Then the optimal economical technology for preparing super high performance concrete is using a coarse aggregate,whose key point is how to sett le the problem due to the course aggregate.
2005, 35(1): 21-23.
doi: 10.13204/j.gyjz200501006
Abstract:
It was studied that the effect of addition of fly ash and silica fume on self-leveling concrete strength and fluidity; according to the experimental data obtained, the strength empirical equation of high stren gth self-leveling concrete was summarized; it was also analyzed that the later strength increasing rule of high strength self-leveling concrete with flyash an d silica fume; C90 high strength self-leveling concrete can be prepared. By gra de 42.5 ordinary Portland cement, medium sand, 5～25mm broken stone, water/ceme ntitious materials ratio 0.267～0.285, addition of 10% flyash and 10%～15% sil ica fume, or water/cementitious materials ratio 0.266,addition of 20% flyash and 1 5% silica fume, proper quantity of NF-2-6 retarding high effect water-reducin g agent.
It was studied that the effect of addition of fly ash and silica fume on self-leveling concrete strength and fluidity; according to the experimental data obtained, the strength empirical equation of high stren gth self-leveling concrete was summarized; it was also analyzed that the later strength increasing rule of high strength self-leveling concrete with flyash an d silica fume; C90 high strength self-leveling concrete can be prepared. By gra de 42.5 ordinary Portland cement, medium sand, 5～25mm broken stone, water/ceme ntitious materials ratio 0.267～0.285, addition of 10% flyash and 10%～15% sil ica fume, or water/cementitious materials ratio 0.266,addition of 20% flyash and 1 5% silica fume, proper quantity of NF-2-6 retarding high effect water-reducin g agent.
2005, 35(1): 24-26.
doi: 10.13204/j.gyjz200501007
Abstract:
Participation of inhabitants is the embodiment of inhabitants environmental right, and the research on participatory consciousn e ss of inhabitants in the living environment evaluation is the basis for studying the evaluation system of light environment of dwelling. According to the resear ch result of the participatory frequency, level and quality of the inhabitants participation in the questionnaire method, expert consultation and letter invest igation, this paper studies and analyses the present situation, problems and cau ses of participatory consciousness of inhabitants in the living environment eval uation. It points out environmental consciousness of the small environment, th e big problem, and raises the solutions that using living environment as work consciousness of healthy engineering, customizing the quality standard and eval uation system, enlarging the education of environmental protection, strengthenin g the monitoring of living environment quality, and so on.
Participation of inhabitants is the embodiment of inhabitants environmental right, and the research on participatory consciousn e ss of inhabitants in the living environment evaluation is the basis for studying the evaluation system of light environment of dwelling. According to the resear ch result of the participatory frequency, level and quality of the inhabitants participation in the questionnaire method, expert consultation and letter invest igation, this paper studies and analyses the present situation, problems and cau ses of participatory consciousness of inhabitants in the living environment eval uation. It points out environmental consciousness of the small environment, th e big problem, and raises the solutions that using living environment as work consciousness of healthy engineering, customizing the quality standard and eval uation system, enlarging the education of environmental protection, strengthenin g the monitoring of living environment quality, and so on.
2005, 35(1): 27-29,17.
doi: 10.13204/j.gyjz200501008
Abstract:
It is discussed that the calculation of the effec ts of the difference of temperature caused by sunlight on super-long tall buildings. On the basis of analyzing the characteristics of the sunlight radiation, the cal culating case of the sunlight action is designed, whose parameters are provided. Using the current finite element analysis application, the whole temperature ef fects of the sunlight action on No.2 Long-Distance Telecom Hinge in Zhengzhou a re studied, meanwhile, the whole temperature distortion and the temperature inte rnal force or stress are calculated and analyzed. Therefore, it is given that th e speciality of the whole structure distortion and the scope and distribution of the internal force or stress of each kind of components under sunlight temperat ure case. These results may be a reference for engineering design and constructi on.
It is discussed that the calculation of the effec ts of the difference of temperature caused by sunlight on super-long tall buildings. On the basis of analyzing the characteristics of the sunlight radiation, the cal culating case of the sunlight action is designed, whose parameters are provided. Using the current finite element analysis application, the whole temperature ef fects of the sunlight action on No.2 Long-Distance Telecom Hinge in Zhengzhou a re studied, meanwhile, the whole temperature distortion and the temperature inte rnal force or stress are calculated and analyzed. Therefore, it is given that th e speciality of the whole structure distortion and the scope and distribution of the internal force or stress of each kind of components under sunlight temperat ure case. These results may be a reference for engineering design and constructi on.
2005, 35(1): 30-32.
doi: 10.13204/j.gyjz200501009
Abstract:
Multifunctional vibration-absorption megaframe structures can dissipat e energy by multiple tuned mass dampers, base isolaters and dampers. The princip le of energy dissipation of Multifunctional vibration- absorption megaframe str u ctures is clarified by frequency domain analysis. The rules of ratio of lateral top displacement of main frame changing with the turn ratio and damping ratio of subframes are obtained. The fluctuation wind loads are simulated by harmonic sy nthetic method. The rusults of frequency domain analysis are verified by time do main finite element analysis. The result shows that, compared with normal megafr ame structures, the wind induced response of multifunctional vibration-absorpti on megaframe structures can be greatly reduced.
Multifunctional vibration-absorption megaframe structures can dissipat e energy by multiple tuned mass dampers, base isolaters and dampers. The princip le of energy dissipation of Multifunctional vibration- absorption megaframe str u ctures is clarified by frequency domain analysis. The rules of ratio of lateral top displacement of main frame changing with the turn ratio and damping ratio of subframes are obtained. The fluctuation wind loads are simulated by harmonic sy nthetic method. The rusults of frequency domain analysis are verified by time do main finite element analysis. The result shows that, compared with normal megafr ame structures, the wind induced response of multifunctional vibration-absorpti on megaframe structures can be greatly reduced.
2005, 35(1): 33-36.
doi: 10.13204/j.gyjz200501010
Abstract:
Based on the experiment study of two 1/15 scale shear wall model struc tures with R.C. frame column under low frequency cyclic and reversed lateral lo ads, the interacting behavior of the R.C. frame column and the shear wall is st udied, the failure mechanism and energy dissipation mechanism of moderate and ta ll shear wall with R.C. frame column are compared, and the Earthquake Resistant behavior is evaluated by the comparison of bearing capacity, stiffness, ductili ty, rest oring force characteristics as well as energy consumption ability. It was showed by the experimental results that the earthquake resistant behavior of some stru cture is satisfactory.
Based on the experiment study of two 1/15 scale shear wall model struc tures with R.C. frame column under low frequency cyclic and reversed lateral lo ads, the interacting behavior of the R.C. frame column and the shear wall is st udied, the failure mechanism and energy dissipation mechanism of moderate and ta ll shear wall with R.C. frame column are compared, and the Earthquake Resistant behavior is evaluated by the comparison of bearing capacity, stiffness, ductili ty, rest oring force characteristics as well as energy consumption ability. It was showed by the experimental results that the earthquake resistant behavior of some stru cture is satisfactory.
2005, 35(1): 37-39.
doi: 10.13204/j.gyjz200501011
Abstract:
The analysis of structural lecto types for a comp ound system composed by beam, column and brace with less sections, which substit utes supporting wall in multi-story residence, is carried out. Internal forces of the system acted under vertical loads and wind loads are calculated by differ ent software. As a result, the structure system installed with brace has t he minimal internal force under vertical load, and its member bending moment and shear force accounts for from 1/20 to 1/60 of those of other kinds of modes. Bu t the internal forces have less difference among three kinds of braced structure s under horizontal load, it illustrates that three kinds of structural types hav e almost equal ability in resisting lateral pressure. Compared with frame struc ture, beam moment and column moment of the structural system with brace a c count for 1/50 and 1/25 of that of frame structure. Therefore, the system instal led with brace can be regarded as rather rational structural system among new compound structural systems.
The analysis of structural lecto types for a comp ound system composed by beam, column and brace with less sections, which substit utes supporting wall in multi-story residence, is carried out. Internal forces of the system acted under vertical loads and wind loads are calculated by differ ent software. As a result, the structure system installed with brace has t he minimal internal force under vertical load, and its member bending moment and shear force accounts for from 1/20 to 1/60 of those of other kinds of modes. Bu t the internal forces have less difference among three kinds of braced structure s under horizontal load, it illustrates that three kinds of structural types hav e almost equal ability in resisting lateral pressure. Compared with frame struc ture, beam moment and column moment of the structural system with brace a c count for 1/50 and 1/25 of that of frame structure. Therefore, the system instal led with brace can be regarded as rather rational structural system among new compound structural systems.
2005, 35(1): 40-41,46.
doi: 10.13204/j.gyjz200501012
Abstract:
It is explored that some problems of des igning the structure of the short pier shear wall, such as the conception of str ucture system,the laying principle, the points of the calculation and analysis a nd the structural requirements ect; some suggestions are presented to designing engineers as reference.
It is explored that some problems of des igning the structure of the short pier shear wall, such as the conception of str ucture system,the laying principle, the points of the calculation and analysis a nd the structural requirements ect; some suggestions are presented to designing engineers as reference.
2005, 35(1): 42-46.
doi: 10.13204/j.gyjz200501013
Abstract:
This paper analyzes the characteristics of settlement trough induced by shield construction in soft soil area in Shangha i based on test data in situ.The shape of the trough, the relationship betw een trough and depth of tunnel, trough evolvement with time and relationship bet ween trough wide coefficient and tunnel depth and time are profoundly researched mainly using the methods of statistics, fitting, comparison and drawing etc. Fr om which the conclusions which are of important guidance to soft soil area are obtained.
This paper analyzes the characteristics of settlement trough induced by shield construction in soft soil area in Shangha i based on test data in situ.The shape of the trough, the relationship betw een trough and depth of tunnel, trough evolvement with time and relationship bet ween trough wide coefficient and tunnel depth and time are profoundly researched mainly using the methods of statistics, fitting, comparison and drawing etc. Fr om which the conclusions which are of important guidance to soft soil area are obtained.
2005, 35(1): 47-49.
doi: 10.13204/j.gyjz200501014
Abstract:
The observed displacement in different depth of a composite foundation with low-strength piles under embankment is analyzed.According to the settlement in dif ferent depth, major compressive deformation develops in area nearby stabilized l ayer bottom.As pile length increases the area increases.Lateral displacement in different depth decreases as the depth increases and it gets slow down gradually .
The observed displacement in different depth of a composite foundation with low-strength piles under embankment is analyzed.According to the settlement in dif ferent depth, major compressive deformation develops in area nearby stabilized l ayer bottom.As pile length increases the area increases.Lateral displacement in different depth decreases as the depth increases and it gets slow down gradually .
2005, 35(1): 50-52.
doi: 10.13204/j.gyjz200501015
Abstract:
Based on the exponential curve fitting method, a new method for calculating the consolidation coefficient-the geometric progression method was put forward.And based on the settlement observation curve of the trial embankment of an express railway on soft clay ground, two kinds of methods were compared and analyzed by calculating the consolidation coefficient.The results showed that the rule of va riation of consolidation coefficient calculated by the geometric progression met hod was clear, and it could avoid the influence of error brought by the exponen tial curve fitting method.The results of the geometric progression method and th e laboratory test belonged to the same order of magnitude.
Based on the exponential curve fitting method, a new method for calculating the consolidation coefficient-the geometric progression method was put forward.And based on the settlement observation curve of the trial embankment of an express railway on soft clay ground, two kinds of methods were compared and analyzed by calculating the consolidation coefficient.The results showed that the rule of va riation of consolidation coefficient calculated by the geometric progression met hod was clear, and it could avoid the influence of error brought by the exponen tial curve fitting method.The results of the geometric progression method and th e laboratory test belonged to the same order of magnitude.
2005, 35(1): 53-55.
doi: 10.13204/j.gyjz200501016
Abstract:
A reliability method for reinforced reta ining wall is presented.The failure probabilities of every mode are calculated a nd compared with the safety factors of traditional method.The influence of varia tion of soil parameters to the safety index is analyzed.
A reliability method for reinforced reta ining wall is presented.The failure probabilities of every mode are calculated a nd compared with the safety factors of traditional method.The influence of varia tion of soil parameters to the safety index is analyzed.
2005, 35(1): 56-58,36.
doi: 10.13204/j.gyjz200501017
Abstract:
It is analyzed that the construction sty les, behavior and influence factors for commonly used steel reinforced concrete beam-column joints.According to the existing test data on joints, this paper co mpares several formulas in our country of calculating the shear-carrying capaci ty on joints__especially the formulas prescribed by Specification for Desi gn of Steel Reinforced Concrete(YB 9082-97) and Technical Specification f or Steel Reinforced Concrete Composite Structures(JGJ 138-2001).The inadequac y in our studies on steel reinforced concrete beam-column joints is pointed out .
It is analyzed that the construction sty les, behavior and influence factors for commonly used steel reinforced concrete beam-column joints.According to the existing test data on joints, this paper co mpares several formulas in our country of calculating the shear-carrying capaci ty on joints__especially the formulas prescribed by Specification for Desi gn of Steel Reinforced Concrete(YB 9082-97) and Technical Specification f or Steel Reinforced Concrete Composite Structures(JGJ 138-2001).The inadequac y in our studies on steel reinforced concrete beam-column joints is pointed out .
2005, 35(1): 59-61.
doi: 10.13204/j.gyjz200501018
Abstract:
A new type of column-RC beam joint of concrete f illed steel tube(CFST) is created.The outer tubular column of CFST is disconnect ed in the joint zone.The core steel tube is put in the joint zone.The design of the member and experiment,phenomenon of the experiment and process of failure ar e introduced.The author analyzes the existing problems and the improving idea of the new type of joint.The research shows that the new type of joint is successf ully used in the side joint.
A new type of column-RC beam joint of concrete f illed steel tube(CFST) is created.The outer tubular column of CFST is disconnect ed in the joint zone.The core steel tube is put in the joint zone.The design of the member and experiment,phenomenon of the experiment and process of failure ar e introduced.The author analyzes the existing problems and the improving idea of the new type of joint.The research shows that the new type of joint is successf ully used in the side joint.
2005, 35(1): 62-64.
doi: 10.13204/j.gyjz200501019
Abstract:
To study the performance of centrifugal concrete-filled steel tubes under bending and torsion,a real-size experiment on 11 tub es is done.The relevant operating method including equipment,subjects and proces ses is introduced.On different loading paths,the main factors that effect deform ation and stiffness and mechanism of break are studied.The experimental stress a nalysis shows that values of practical critical stress of the steel tube corresp ond well with Mises Yielding Rule.Finally,a correlate equation of bearing capaci ty of this structure under bending and torsion is deduced,which may provide a ba sis for design of such structures.
To study the performance of centrifugal concrete-filled steel tubes under bending and torsion,a real-size experiment on 11 tub es is done.The relevant operating method including equipment,subjects and proces ses is introduced.On different loading paths,the main factors that effect deform ation and stiffness and mechanism of break are studied.The experimental stress a nalysis shows that values of practical critical stress of the steel tube corresp ond well with Mises Yielding Rule.Finally,a correlate equation of bearing capaci ty of this structure under bending and torsion is deduced,which may provide a ba sis for design of such structures.
2005, 35(1): 65-66,55.
doi: 10.13204/j.gyjz200501020
Abstract:
The pattern of crack propagation and the forced f eatures of concrete and section steel are analyzed in detail by the experiment o f the steel encased light aggregate concrete beams.The failure mode and shear me chanism have been researched.The influence factors on the ultimate shear strengt h is determined by the theory and experiment.The theoretical calculating formula s of shear strength of steel encased light aggregate beams are proposed by compl ex method.The formulas are verified by testing results.A good agreement is obtai ned between the calculating results and the experimental results.
The pattern of crack propagation and the forced f eatures of concrete and section steel are analyzed in detail by the experiment o f the steel encased light aggregate concrete beams.The failure mode and shear me chanism have been researched.The influence factors on the ultimate shear strengt h is determined by the theory and experiment.The theoretical calculating formula s of shear strength of steel encased light aggregate beams are proposed by compl ex method.The formulas are verified by testing results.A good agreement is obtai ned between the calculating results and the experimental results.
2005, 35(1): 67-68,85.
doi: 10.13204/j.gyjz200501021
Abstract:
The reconstructive project of Zhejiang Province S ubsidiary of China Construction Bank is introduced.Associated with this project, the design methods of steel structure located at high-rise building top are ill ustrated at length.According to the new load code for design of building structu res,the authors discuss some problems such as wind loads;design of column,beam,b race and joint.These methods may be a reference for the design of high-rise ste el structure.
The reconstructive project of Zhejiang Province S ubsidiary of China Construction Bank is introduced.Associated with this project, the design methods of steel structure located at high-rise building top are ill ustrated at length.According to the new load code for design of building structu res,the authors discuss some problems such as wind loads;design of column,beam,b race and joint.These methods may be a reference for the design of high-rise ste el structure.
2005, 35(1): 69-70,81.
doi: 10.13204/j.gyjz200501022
Abstract:
Bond damage in steel reinforced concrete(SRC) is very complicated,whose mechanism is seldom studied as yet.Probability is introdu ced to define damage,based on which a new constitutive model of bond damage in S RC is proposed,and the push-out test result is used to demonstrate the course o f damage.
Bond damage in steel reinforced concrete(SRC) is very complicated,whose mechanism is seldom studied as yet.Probability is introdu ced to define damage,based on which a new constitutive model of bond damage in S RC is proposed,and the push-out test result is used to demonstrate the course o f damage.
2005, 35(1): 71-74,64.
doi: 10.13204/j.gyjz200501023
Abstract:
It has been introduced that the work content of installation and maintenance stage for the membrane structure,including the inst a l lation process and precautions,as well as the installation methods for the diffe rent kinds of membrane structures,which were presented by the example projects,a nd the maintenance repair methods.
It has been introduced that the work content of installation and maintenance stage for the membrane structure,including the inst a l lation process and precautions,as well as the installation methods for the diffe rent kinds of membrane structures,which were presented by the example projects,a nd the maintenance repair methods.
2005, 35(1): 75-78.
doi: 10.13204/j.gyjz200501024
Abstract:
Through collecting a lot of test information,a BP neural network is set up, whi ch can forecast the compression-resisting of square section-concrete columns r einforced with CFRP. By comparing the simulation data with those of the experime nt, it is proved that the network can forecast efficiently; and the factors infl uencing the reinforcing effect are also analysed and the conclusions are in acco rd with the research report.
Through collecting a lot of test information,a BP neural network is set up, whi ch can forecast the compression-resisting of square section-concrete columns r einforced with CFRP. By comparing the simulation data with those of the experime nt, it is proved that the network can forecast efficiently; and the factors infl uencing the reinforcing effect are also analysed and the conclusions are in acco rd with the research report.
2005, 35(1): 79-81.
doi: 10.13204/j.gyjz200501025
Abstract:
The design method of strengthening with external prestressing tend on was introduced in details. Visual software was designed according to the des ign code. This paper also introduces in detail the external prestressing module and the method of Southeast University Deep Strengthing Software System (SEU- DEEP). The design method was illuminated by practical example at last. The resul t according to the software is agreed with the design code very well.
The design method of strengthening with external prestressing tend on was introduced in details. Visual software was designed according to the des ign code. This paper also introduces in detail the external prestressing module and the method of Southeast University Deep Strengthing Software System (SEU- DEEP). The design method was illuminated by practical example at last. The resul t according to the software is agreed with the design code very well.
2005, 35(1): 82-85.
doi: 10.13204/j.gyjz200501026
Abstract:
Runyang Yangtse River Highway Bridge is the longest bridge at present,it is prac tically significant to health monitoring, diagnosis, forecast and evaluation of injury influenced by disasters, during its building and working, also, it is the purpose of the Health Monitoring System of Runyang Bridge. As one of the most i mportant problems of the system, optimum placement of sensor must be sloved rati onally. From this point of view, in detail this paper introduces the primary aca demic gist, which contains analytic result of finite element model and optimum p lacement of sensor in girder based on generalized genetic algorithm, and sensor placement for the Health Monitoring System of Runyang Bridge.
Runyang Yangtse River Highway Bridge is the longest bridge at present,it is prac tically significant to health monitoring, diagnosis, forecast and evaluation of injury influenced by disasters, during its building and working, also, it is the purpose of the Health Monitoring System of Runyang Bridge. As one of the most i mportant problems of the system, optimum placement of sensor must be sloved rati onally. From this point of view, in detail this paper introduces the primary aca demic gist, which contains analytic result of finite element model and optimum p lacement of sensor in girder based on generalized genetic algorithm, and sensor placement for the Health Monitoring System of Runyang Bridge.
2005, 35(1): 86-88.
doi: 10.13204/j.gyjz200501027
Abstract:
Experiments on bending deformation of circumferential joint in shield tunneling segment for subway were conducted. Tangential load and bending moment were appl ied by two loading equipments. Tangential load was impressed firstly; when it wa s up to 750kN, it was kept at this level and bending moment was applied. The exp erimental curves of bending moment versus relative angle near the joint are obta ined, each of which was available for the surfaces of two segments contact both fully and partly.
Experiments on bending deformation of circumferential joint in shield tunneling segment for subway were conducted. Tangential load and bending moment were appl ied by two loading equipments. Tangential load was impressed firstly; when it wa s up to 750kN, it was kept at this level and bending moment was applied. The exp erimental curves of bending moment versus relative angle near the joint are obta ined, each of which was available for the surfaces of two segments contact both fully and partly.
2005, 35(1): 89-92.
doi: 10.13204/j.gyjz200501028
Abstract:
Based on actual projects, the following questions of design and constructi on of long-span and heavy-load industrial construction frame structure were e xplored: seismic fortification, conception design, control of axial comp ressi on ratio of frame column, installation of embedded components, detailing and con struction of frame joint.Useful inspiration was provided for the structure desi gn and construction of the other similar industrial projects.
Based on actual projects, the following questions of design and constructi on of long-span and heavy-load industrial construction frame structure were e xplored: seismic fortification, conception design, control of axial comp ressi on ratio of frame column, installation of embedded components, detailing and con struction of frame joint.Useful inspiration was provided for the structure desi gn and construction of the other similar industrial projects.
2005, 35(1): 93-95.
doi: 10.13204/j.gyjz200501029
Abstract:
It has been first analyzed that the occurrence, essence and feature of structura lism; and then the positive negative effects of structuralism on architectural creation were also explored.
It has been first analyzed that the occurrence, essence and feature of structura lism; and then the positive negative effects of structuralism on architectural creation were also explored.
2005, 35(1): 96-97,92.
doi: 10.13204/j.gyjz200501030
Abstract:
New Urbanism is a trend of urban design rising in 1990's in western countries,wh ich is based on the rethinking of suburban sprawl in the USA.This article introd uces the main principles and planning key points of New Urbanism and analyzes th e meaning of referring New Urbanism to resolve urban sprawl and development of s uburb in China.
New Urbanism is a trend of urban design rising in 1990's in western countries,wh ich is based on the rethinking of suburban sprawl in the USA.This article introd uces the main principles and planning key points of New Urbanism and analyzes th e meaning of referring New Urbanism to resolve urban sprawl and development of s uburb in China.
