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2005 Vol. 35, No. 7
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2005, 35(7): 1-3,13.
doi: 10.13204/j.gyjz200507001
Abstract:
A rapid development of economy leads to increase in energy consumption. How to deal with the relation between development and eneryg- saving is a major issue of realizing a sustainable development. It is deeply explored that the activity of making policy and standard, determination of proper energy- saving target, material encouraging policy, the positions of all parties in environment of building energy-saving market, according to policy and standards as well as constructing a building energy- saving market, which are demonstrated by cases abroad. It is expected to be useful for the development of energysaving in China.
A rapid development of economy leads to increase in energy consumption. How to deal with the relation between development and eneryg- saving is a major issue of realizing a sustainable development. It is deeply explored that the activity of making policy and standard, determination of proper energy- saving target, material encouraging policy, the positions of all parties in environment of building energy-saving market, according to policy and standards as well as constructing a building energy- saving market, which are demonstrated by cases abroad. It is expected to be useful for the development of energysaving in China.
2005, 35(7): 4-6,25.
doi: 10.13204/j.gyjz200507002
Abstract:
This prefabricated wall panel system of energy-saving residence is developed with the needs of wall reform in China and building energy- saving.With the brief intrudution to an experimental unitproject, the background of development, the thermodynamic performance and material characteristics of the prefabricated wall panel system are described.
This prefabricated wall panel system of energy-saving residence is developed with the needs of wall reform in China and building energy- saving.With the brief intrudution to an experimental unitproject, the background of development, the thermodynamic performance and material characteristics of the prefabricated wall panel system are described.
2005, 35(7): 7-10,98.
doi: 10.13204/j.gyjz200507003
Abstract:
The design scheme of the demonstration building with ultra- low energy consumption in Tsinghua University introduced briefly, and the application of green energies, such as solar energy and hydrogen energy in this project is described in detail. At last a new intelligent control concept/ from net flat to facilities plug and play0 is also provided.
The design scheme of the demonstration building with ultra- low energy consumption in Tsinghua University introduced briefly, and the application of green energies, such as solar energy and hydrogen energy in this project is described in detail. At last a new intelligent control concept/ from net flat to facilities plug and play0 is also provided.
2005, 35(7): 11-13.
doi: 10.13204/j.gyjz200507004
Abstract:
Based on the analysis of the energy- saving design of a residential building in Jiangyin Xinqiao Garden, the authors present the methods of the energy- saving design of multistorey residential buildings in the area of being hot in summer and cold in winter.
Based on the analysis of the energy- saving design of a residential building in Jiangyin Xinqiao Garden, the authors present the methods of the energy- saving design of multistorey residential buildings in the area of being hot in summer and cold in winter.
2005, 35(7): 14-15,22.
doi: 10.13204/j.gyjz200507005
Abstract:
The situation and tendency of building energy consumption and the destructive effect on air environment due to this building energy consumption are introduced. If afforestation on the building roof had been widespread, building energy consumption( especially in summer) and the destructive effect on air environment due to this building energy consumption could be greatly lowered, also the capacity of air conditioning services, the operational time and intensity of air conditioning system, the environmental load from the air conditioning services and system could also be lowered, our air environment could be better upgraded.
The situation and tendency of building energy consumption and the destructive effect on air environment due to this building energy consumption are introduced. If afforestation on the building roof had been widespread, building energy consumption( especially in summer) and the destructive effect on air environment due to this building energy consumption could be greatly lowered, also the capacity of air conditioning services, the operational time and intensity of air conditioning system, the environmental load from the air conditioning services and system could also be lowered, our air environment could be better upgraded.
2005, 35(7): 16-18,42.
doi: 10.13204/j.gyjz200507006
Abstract:
According to native features of town houseings in the area of being hot in summer and cold in winter, and the higher demands on comfort of indoor thermal environment by people, this paper discusses the measurves of building energysaving from building environment, exterior \ | protected construction and awareness of saving energy.
According to native features of town houseings in the area of being hot in summer and cold in winter, and the higher demands on comfort of indoor thermal environment by people, this paper discusses the measurves of building energysaving from building environment, exterior \ | protected construction and awareness of saving energy.
2005, 35(7): 19-22.
doi: 10.13204/j.gyjz200507007
Abstract:
Doors and windows are weak link in heat insulation of small town building.With the constant enlargement of the doors and windows, building energy consumption increases constantly. So research on the energy- conservation of the doors and windows has a very important meanings in improving indoor hot environment of a room. Starting in the importance of energy- saving of doors and windows, the way to the energy loss of doors and windows is analyzed, and the measures of energysaving of doors and windows are also proposed.
Doors and windows are weak link in heat insulation of small town building.With the constant enlargement of the doors and windows, building energy consumption increases constantly. So research on the energy- conservation of the doors and windows has a very important meanings in improving indoor hot environment of a room. Starting in the importance of energy- saving of doors and windows, the way to the energy loss of doors and windows is analyzed, and the measures of energysaving of doors and windows are also proposed.
2005, 35(7): 23-25.
doi: 10.13204/j.gyjz200507008
Abstract:
Combined with natural conditions and resources feature of the village in Xinjiang, exploring regional green building materials, using suitable structural technique and reducing the cost of rural housing to the maximum extent, which based on planning design, design of indoor type and structural design have been put forward for energy- saving design and environmental protection of rural housing. In order to achieve the purposes of energy- saving, environmental protection, economic and persist in sustainable development, abundant solar energy resources in Xinjiang have been utilized fully.
Combined with natural conditions and resources feature of the village in Xinjiang, exploring regional green building materials, using suitable structural technique and reducing the cost of rural housing to the maximum extent, which based on planning design, design of indoor type and structural design have been put forward for energy- saving design and environmental protection of rural housing. In order to achieve the purposes of energy- saving, environmental protection, economic and persist in sustainable development, abundant solar energy resources in Xinjiang have been utilized fully.
RESEARCH ON FAILURE MECHANISM AND DESIGN METHOD OF ABNORMAL FRAME JOINTS IN INDUSTRIAL MILL BUILDING
2005, 35(7): 26-28.
doi: 10.13204/j.gyjz200507009
Abstract:
The R. C. frame-bent structures commonly contain abnormal joints. Based on the experimental result, the damage mechanism and the failure of abnormal joints under the shear force are analyzed. According to experimental result, the formula for calculation of the shear-bearing capacity of abnormal joints and the method for strengthening the abnormal joints are given, which provides a basis for rational design of the abnormal joints.
The R. C. frame-bent structures commonly contain abnormal joints. Based on the experimental result, the damage mechanism and the failure of abnormal joints under the shear force are analyzed. According to experimental result, the formula for calculation of the shear-bearing capacity of abnormal joints and the method for strengthening the abnormal joints are given, which provides a basis for rational design of the abnormal joints.
2005, 35(7): 29-33,38.
doi: 10.13204/j.gyjz200507010
Abstract:
Cores of RC beam- column joints in two-way frames canct be directly upgraded as that in one-way frames because of the ex istence of two-way beams. In this paper, five full-scale beam- column joints are tested under quas-i static cycle load, to evaluate the shear performance improvement of beam- column joints upgraded by two different CFRP sheets strengthening methods that are around core, and the strengthening mechanism is also presented for different methods.
Cores of RC beam- column joints in two-way frames canct be directly upgraded as that in one-way frames because of the ex istence of two-way beams. In this paper, five full-scale beam- column joints are tested under quas-i static cycle load, to evaluate the shear performance improvement of beam- column joints upgraded by two different CFRP sheets strengthening methods that are around core, and the strengthening mechanism is also presented for different methods.
2005, 35(7): 34-38.
doi: 10.13204/j.gyjz200507011
Abstract:
For reinforced concrete beam- slab structures, the approximate formulas of temperature and shrinkage internal forces are introduced, and the formulas of critical internal forces of temperature and shrinkage, by which the overlong structural members can be judged, are deduced on the basis of the Code formula of cracking width. And for the overlong structures, the formulas of temperature and shrinkage reinforcements and some reinforcing measures are presented. All of these can be used as one of the effected ways and calculating basis for cracking resistance design of reinforced concrete beam-slab structures.
For reinforced concrete beam- slab structures, the approximate formulas of temperature and shrinkage internal forces are introduced, and the formulas of critical internal forces of temperature and shrinkage, by which the overlong structural members can be judged, are deduced on the basis of the Code formula of cracking width. And for the overlong structures, the formulas of temperature and shrinkage reinforcements and some reinforcing measures are presented. All of these can be used as one of the effected ways and calculating basis for cracking resistance design of reinforced concrete beam-slab structures.
2005, 35(7): 39-42.
doi: 10.13204/j.gyjz200507012
Abstract:
In order to control the seismic response of the tall building and eliminate the / time lag0 phenomenon by actuation of the control mechanism, intelligent TMD is proposed which consists ofMR dampers. The change of yield stress of MR fluids is in the same way of magnetic field. So the controlling force of the intelligent TMD can be adjusted by changing magnetic field. According to instantaneouw optimum control principle, we use the improved sem-i active control strategy which derived from the Hrovat and on- off control strategy to analyse the parameters of the MR dampers. An eight storied frame structure is analysed. From the numerical analysis, we can see the dvice could diminish the seismic response of a tall structure.
In order to control the seismic response of the tall building and eliminate the / time lag0 phenomenon by actuation of the control mechanism, intelligent TMD is proposed which consists ofMR dampers. The change of yield stress of MR fluids is in the same way of magnetic field. So the controlling force of the intelligent TMD can be adjusted by changing magnetic field. According to instantaneouw optimum control principle, we use the improved sem-i active control strategy which derived from the Hrovat and on- off control strategy to analyse the parameters of the MR dampers. An eight storied frame structure is analysed. From the numerical analysis, we can see the dvice could diminish the seismic response of a tall structure.
2005, 35(7): 43-45.
doi: 10.13204/j.gyjz200507013
Abstract:
This paper introduces a fatigue limit measuring method of steel bar in concrete based on residual strength, experimental results show that the method can cut down experimental time, reduce discreteness of data, and the precision of data is thus improved.
This paper introduces a fatigue limit measuring method of steel bar in concrete based on residual strength, experimental results show that the method can cut down experimental time, reduce discreteness of data, and the precision of data is thus improved.
2005, 35(7): 46-49.
doi: 10.13204/j.gyjz200507014
Abstract:
This paper research the behavior of reinforced concrete member with corroded steel bar in compressive area by experiment. Experiment results have shown that the main effect is the decrease in cross section stiffness with the corrosion of steel bar, which mainly occurs during the time between the initiation of corrosion and that the compressive area concrete is cracked by corrosion of steel bar, and the amount is affected by the amount of acting load, but no destruction occurs during the corrosion of compressive steel bar.
This paper research the behavior of reinforced concrete member with corroded steel bar in compressive area by experiment. Experiment results have shown that the main effect is the decrease in cross section stiffness with the corrosion of steel bar, which mainly occurs during the time between the initiation of corrosion and that the compressive area concrete is cracked by corrosion of steel bar, and the amount is affected by the amount of acting load, but no destruction occurs during the corrosion of compressive steel bar.
2005, 35(7): 50-54,49.
doi: 10.13204/j.gyjz200507015
Abstract:
A modified model of ful-l load transfer is proposed of long piles for the soft foundation in Shanghai based on analytic method of load transfer. The unification of processing softened and hardened soil models is realized by the modified model, which can reflect not only pile- soil slip and degradation of frictional resistance, but also reflect asynchronous action of lateral friction and lateral resistance. It is very useful for further research on load transfer mechanism of piled foundations.
A modified model of ful-l load transfer is proposed of long piles for the soft foundation in Shanghai based on analytic method of load transfer. The unification of processing softened and hardened soil models is realized by the modified model, which can reflect not only pile- soil slip and degradation of frictional resistance, but also reflect asynchronous action of lateral friction and lateral resistance. It is very useful for further research on load transfer mechanism of piled foundations.
2005, 35(7): 55-58,66.
doi: 10.13204/j.gyjz200507016
Abstract:
By analyzing dumping undrained true triaxial test of excavation soil mass, it is studied the relation between generalized shear stress and generalized shear strain derived by generalized Hook. s law. Then intermediate principal stress coefficient is defined based on actual stress path and a shearing modulus. formula is also derived under plane unit elongation strain condition. The study results show that generalized shear stress has a strong nonlinear relation with generalized shear strain, and intermediate principal stress has interval effect on soil strength. The strength of soil enhances to a certain peak value gradually and diminishes gradually in the process of intermediate principal stress 2 increases from 3 to 1.
By analyzing dumping undrained true triaxial test of excavation soil mass, it is studied the relation between generalized shear stress and generalized shear strain derived by generalized Hook. s law. Then intermediate principal stress coefficient is defined based on actual stress path and a shearing modulus. formula is also derived under plane unit elongation strain condition. The study results show that generalized shear stress has a strong nonlinear relation with generalized shear strain, and intermediate principal stress has interval effect on soil strength. The strength of soil enhances to a certain peak value gradually and diminishes gradually in the process of intermediate principal stress 2 increases from 3 to 1.
2005, 35(7): 59-63.
doi: 10.13204/j.gyjz200507017
Abstract:
Based on field dead load test for two supergiant bridges of a expressway project, this paper studied the applicability of the technology of pressure grouting at pile tip to bored piles in pebble stratum, and the bearing characteristics of bored piles after applying this technology. The findings show that the bored piles using pressure grouting at pile tip have good adaptability to strata and can remarkably improve the bearing capability and decrease the settlement of pile foundations, and consequently acquire remarable economic and social benefit. After pressure grouting on pile tip, elasticworking range of piles will be extended and be in favour of pile to bear repeated loads and dynamic loads. At the same time, for bored pile using pressure grouting at pile tip, failure mode of material strength damage is likely to occur and attention should be paid to their design.
Based on field dead load test for two supergiant bridges of a expressway project, this paper studied the applicability of the technology of pressure grouting at pile tip to bored piles in pebble stratum, and the bearing characteristics of bored piles after applying this technology. The findings show that the bored piles using pressure grouting at pile tip have good adaptability to strata and can remarkably improve the bearing capability and decrease the settlement of pile foundations, and consequently acquire remarable economic and social benefit. After pressure grouting on pile tip, elasticworking range of piles will be extended and be in favour of pile to bear repeated loads and dynamic loads. At the same time, for bored pile using pressure grouting at pile tip, failure mode of material strength damage is likely to occur and attention should be paid to their design.
2005, 35(7): 64-66.
doi: 10.13204/j.gyjz200507018
Abstract:
Using reliability theory and statistic data on soil indexes of soft foundation, a probability analysis of settlement of tank foundation is done and the settlement confines are obtained, which are compared with the final settlement gained on the basis of measured data with hyperbola method. The final settlement is within the confines of predicted field.
Using reliability theory and statistic data on soil indexes of soft foundation, a probability analysis of settlement of tank foundation is done and the settlement confines are obtained, which are compared with the final settlement gained on the basis of measured data with hyperbola method. The final settlement is within the confines of predicted field.
2005, 35(7): 67-70.
doi: 10.13204/j.gyjz200507019
Abstract:
It is presented the experimental processes and results of three L- shape connection specimens with two kinds of reinforcing bars under cyclic loading. Failure pattern, bearing capacity, rigidity degeneration, hysteresis curves and energy dissipation etc are studied systematically. And the seismic performance of the two kinds of specimens is also compared synthetically, which provides a basis for the aseismic design and construction of fiber- reinforced plasterboard. And the consequence of comparison to ordinary bricking- up wall bearing capacity indicates that the specimens are satisfied with operating requirements.
It is presented the experimental processes and results of three L- shape connection specimens with two kinds of reinforcing bars under cyclic loading. Failure pattern, bearing capacity, rigidity degeneration, hysteresis curves and energy dissipation etc are studied systematically. And the seismic performance of the two kinds of specimens is also compared synthetically, which provides a basis for the aseismic design and construction of fiber- reinforced plasterboard. And the consequence of comparison to ordinary bricking- up wall bearing capacity indicates that the specimens are satisfied with operating requirements.
2005, 35(7): 71-73,95.
doi: 10.13204/j.gyjz200507020
Abstract:
Two types of reactive powder concrete( RPC) were prepared by substition of fly- ash for fine quartz sand. The effects of volume fraction of polypropylene fibres and curing conditions on the fracture properties of RPC were studied. The results showed that the good workability can be got by less water reducer and ultimate load was increased, but the fracture energy and ductility index es were decreased with the replacement of fly- ash for fine quartz sand. The study also showed that on the same conditions, the effects on the fracture energy and ductility and fracture toughness are varied with the increase of fibre.
Two types of reactive powder concrete( RPC) were prepared by substition of fly- ash for fine quartz sand. The effects of volume fraction of polypropylene fibres and curing conditions on the fracture properties of RPC were studied. The results showed that the good workability can be got by less water reducer and ultimate load was increased, but the fracture energy and ductility index es were decreased with the replacement of fly- ash for fine quartz sand. The study also showed that on the same conditions, the effects on the fracture energy and ductility and fracture toughness are varied with the increase of fibre.
2005, 35(7): 74-76,70.
doi: 10.13204/j.gyjz200507021
Abstract:
According to the developing history and current research on the intelligent carbon fiber reinforced concrete(CFRC), this paper analyzes the use principles and methods of the intelligent CFRC and its pressure-sensitive and temperature-sensitive effectiveness, puts forward the injure self-diagnosing damage,self-alarming and self-monitoring temperature, self-adapting system for CFRC, and the outlook for the intelligent CFRC is also given.
According to the developing history and current research on the intelligent carbon fiber reinforced concrete(CFRC), this paper analyzes the use principles and methods of the intelligent CFRC and its pressure-sensitive and temperature-sensitive effectiveness, puts forward the injure self-diagnosing damage,self-alarming and self-monitoring temperature, self-adapting system for CFRC, and the outlook for the intelligent CFRC is also given.
2005, 35(7): 77-79.
doi: 10.13204/j.gyjz200507022
Abstract:
Two fitting formulas of the ratio between dynamic critical load and static critical load of spherical shell subjected vertical step load are presented in this paper. The correctness and reliability of these formulas have been proved by large amount of numerical examples.
Two fitting formulas of the ratio between dynamic critical load and static critical load of spherical shell subjected vertical step load are presented in this paper. The correctness and reliability of these formulas have been proved by large amount of numerical examples.
2005, 35(7): 80-82.
doi: 10.13204/j.gyjz200507023
Abstract:
the mechanical properties of fire- resistant steel at elevated temperature are presented in this paper. A practical approach for fire- resistant steel beams is proposed according to the current Chinese Codes for Design of Steel Structures. Comparing with the results of FEM method and the tests, the reliability of this practical approach is verified.
the mechanical properties of fire- resistant steel at elevated temperature are presented in this paper. A practical approach for fire- resistant steel beams is proposed according to the current Chinese Codes for Design of Steel Structures. Comparing with the results of FEM method and the tests, the reliability of this practical approach is verified.
2005, 35(7): 83-85,79.
doi: 10.13204/j.gyjz200507024
Abstract:
In order to promote the use of steel staggered truss system for projects, the influences of the truss and joint texture on the internal force and deformation of the staggered truss systems have been researched in this paper. The detail diagram of joint and its design main points are also given, which may be a reference for design of the system.
In order to promote the use of steel staggered truss system for projects, the influences of the truss and joint texture on the internal force and deformation of the staggered truss systems have been researched in this paper. The detail diagram of joint and its design main points are also given, which may be a reference for design of the system.
2005, 35(7): 86-89.
doi: 10.13204/j.gyjz200507025
Abstract:
Based on the characters of prestressed cable supported lattice shell, a new construction method is bring forward in this paper. In this method the shell is constructed through tensioning by layers and the prestress is applied layer by layer also. An experiments is designed to verify the validity of the new method. besides the tension method and a new node form which is self- designed to cooperate the experiment are discussed in this paper.
Based on the characters of prestressed cable supported lattice shell, a new construction method is bring forward in this paper. In this method the shell is constructed through tensioning by layers and the prestress is applied layer by layer also. An experiments is designed to verify the validity of the new method. besides the tension method and a new node form which is self- designed to cooperate the experiment are discussed in this paper.
2005, 35(7): 90-92,45.
doi: 10.13204/j.gyjz200507026
Abstract:
In this paper, the analysis of the security assessment on Nanjing Dinglin Tower was done, then a comprehensive scheme was suggested to stabilize the foundation and correct settlements, which gave a successful guidance to the project and provided a new thought to the protection of ancient brick- and- stone tower structure.
In this paper, the analysis of the security assessment on Nanjing Dinglin Tower was done, then a comprehensive scheme was suggested to stabilize the foundation and correct settlements, which gave a successful guidance to the project and provided a new thought to the protection of ancient brick- and- stone tower structure.
2005, 35(7): 93-95.
doi: 10.13204/j.gyjz200507027
Abstract:
Problems of reinforced concrete structures strengthened with prestressed FRP are presented, such as the selection of pretensioned force and construction technology etc. Some advices are given for further study with analysis and comparison of domestic and oversea research findings.
Problems of reinforced concrete structures strengthened with prestressed FRP are presented, such as the selection of pretensioned force and construction technology etc. Some advices are given for further study with analysis and comparison of domestic and oversea research findings.
2005, 35(7): 96-98.
doi: 10.13204/j.gyjz200507028
Abstract:
In this paper, ANSYS FEM is used to analyzed the 3- dimention models. Furthermore, the different strengthening forms are also calculated and compared; and design suggestions on the application of engineering are put forward.
In this paper, ANSYS FEM is used to analyzed the 3- dimention models. Furthermore, the different strengthening forms are also calculated and compared; and design suggestions on the application of engineering are put forward.
2005, 35(7): 99-101,63.
doi: 10.13204/j.gyjz200507029
Abstract:
Remodeling and reconstruction of an ex isting tall building are usually related to seismic retrofit in order to satisfy the demands on new designing code. Structural seismic retrofit should be done according to the actual situation. Based on the main principle of proper stiffness of structure which means avoiding too small or large stiffness and effectively controlling torsion, strategy of partial demolition is suggested for the structures with unreasonable stiffness distribution. Three engineering cases are listed here to demonstrate the necessity of the strategy of demolition for structural retrofit.
Remodeling and reconstruction of an ex isting tall building are usually related to seismic retrofit in order to satisfy the demands on new designing code. Structural seismic retrofit should be done according to the actual situation. Based on the main principle of proper stiffness of structure which means avoiding too small or large stiffness and effectively controlling torsion, strategy of partial demolition is suggested for the structures with unreasonable stiffness distribution. Three engineering cases are listed here to demonstrate the necessity of the strategy of demolition for structural retrofit.
