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2004 Vol. 34, No. 11
Display Method:
2004, 34(11): 1-4.
doi: 10.13204/j.gyjz200411001
Abstract:
Based on the structural principle of aviation, the authors give a concrete exposition of the structural principle of a sheet space structure system and the method of its lectotype. The specific analysis of lectotype is also conducted using some typical engineering constructions.
Based on the structural principle of aviation, the authors give a concrete exposition of the structural principle of a sheet space structure system and the method of its lectotype. The specific analysis of lectotype is also conducted using some typical engineering constructions.
2004, 34(11): 5-9.
doi: 10.13204/j.gyjz200411002
Abstract:
After introducing the concept of vertical prop element with alterable stiffness, the theory of system identificationand the ant-i analysis method of FEA are used to study the computing model of vertical prop element with alterable stiffness,and the program for optimization and identification is worked out, with which the - better. or - best. stiffness coefficients of vertica-l prop element with alterable stiffness are obtained.
After introducing the concept of vertical prop element with alterable stiffness, the theory of system identificationand the ant-i analysis method of FEA are used to study the computing model of vertical prop element with alterable stiffness,and the program for optimization and identification is worked out, with which the - better. or - best. stiffness coefficients of vertica-l prop element with alterable stiffness are obtained.
2004, 34(11): 10-13.
doi: 10.13204/j.gyjz200411003
Abstract:
The effect of initial geometrical imperfections on the stability of sheet space structure is a key to its design and calculation.Advanced stochastic imperfections method is put forward,which does not require a large amount of manual computations and by which the reliability of design critical load and critical load with consistent mode imperfections method can be evaluated.The results of perfect model,consistent mode imperfections method,advanced stochastic imperfections method and experiment are compared,by which some conclusions that are useful for engineering design and study of space sheet structure are obtained.
The effect of initial geometrical imperfections on the stability of sheet space structure is a key to its design and calculation.Advanced stochastic imperfections method is put forward,which does not require a large amount of manual computations and by which the reliability of design critical load and critical load with consistent mode imperfections method can be evaluated.The results of perfect model,consistent mode imperfections method,advanced stochastic imperfections method and experiment are compared,by which some conclusions that are useful for engineering design and study of space sheet structure are obtained.
2004, 34(11): 14-18.
doi: 10.13204/j.gyjz200411004
Abstract:
The key theories of the sheet space structure combined with SPSA software development are discussed.They include FEA algorithm,interactive problem;structure stability and structure optimization.
The key theories of the sheet space structure combined with SPSA software development are discussed.They include FEA algorithm,interactive problem;structure stability and structure optimization.
2004, 34(11): 19-20,33.
doi: 10.13204/j.gyjz200411005
Abstract:
The SSS overpass bridge structure is a valuable form of bridge structure designed on the structural principle of light-weight and high-strength.It can be used in multiuse bridges.The specific analyses of its structural principle,lectotype and structural performance are also given by analying typical engineerings.
The SSS overpass bridge structure is a valuable form of bridge structure designed on the structural principle of light-weight and high-strength.It can be used in multiuse bridges.The specific analyses of its structural principle,lectotype and structural performance are also given by analying typical engineerings.
2004, 34(11): 21-23,18.
doi: 10.13204/j.gyjz200411006
Abstract:
Some new types of single-layer industrial mill building structure systems featuring perfect unification of architecture design and construction have been proposed on the basis of summarizing the advantages and disadvantages of traditional structures for single-layer industrial mill buildings.Economic comparison has been made with the traditional portal frame structure.The results show that this type of structure is worth popularizing to single-layer industrial mill buildings.
Some new types of single-layer industrial mill building structure systems featuring perfect unification of architecture design and construction have been proposed on the basis of summarizing the advantages and disadvantages of traditional structures for single-layer industrial mill buildings.Economic comparison has been made with the traditional portal frame structure.The results show that this type of structure is worth popularizing to single-layer industrial mill buildings.
2004, 34(11): 24-26.
doi: 10.13204/j.gyjz200411007
Abstract:
A new calculation method based on artificial neural network(ANN)is presented in daylight design of mill building.According to the previous successful designs,the system has the ability of self-learning and gains experience automatically.The new method features clear concept,convenient agile use,speedy calculation and practical value of engineering design.
A new calculation method based on artificial neural network(ANN)is presented in daylight design of mill building.According to the previous successful designs,the system has the ability of self-learning and gains experience automatically.The new method features clear concept,convenient agile use,speedy calculation and practical value of engineering design.
2004, 34(11): 27-29,48.
doi: 10.13204/j.gyjz200411008
Abstract:
The seismic response of a large-scale thermal power plants main building with frame-bent in the transverse direction and frame-shear wall in the longitudinal direction, under the peak acceleration 50gal. seismic wave had been researched. The following subjects are concerned:the dynamic properties, the effect of torsion on the structure, the interlayer deformation torsional effect, as well as the internal force distribution of the frame-bent. A simplified calculating method was given.
The seismic response of a large-scale thermal power plants main building with frame-bent in the transverse direction and frame-shear wall in the longitudinal direction, under the peak acceleration 50gal. seismic wave had been researched. The following subjects are concerned:the dynamic properties, the effect of torsion on the structure, the interlayer deformation torsional effect, as well as the internal force distribution of the frame-bent. A simplified calculating method was given.
2004, 34(11): 30-33.
doi: 10.13204/j.gyjz200411009
Abstract:
During the application of P.C. members, the service behavior is ineluctable to be affected by some factors. Based on the theoretical analysis of prestress enhancement on flexural stiffness of a P.C. member, further considerations and analysis of actual influences caused by friction loss, creep and shrinkage were taken. Effects in the corresponding circumstances had been analyzed and commented. After considerate discussion for the typical results on flexural stiffness, instructional usage was pointed out, which could be used as a reference to evaluate the practical performance of P.C. members for designer and constructor.
During the application of P.C. members, the service behavior is ineluctable to be affected by some factors. Based on the theoretical analysis of prestress enhancement on flexural stiffness of a P.C. member, further considerations and analysis of actual influences caused by friction loss, creep and shrinkage were taken. Effects in the corresponding circumstances had been analyzed and commented. After considerate discussion for the typical results on flexural stiffness, instructional usage was pointed out, which could be used as a reference to evaluate the practical performance of P.C. members for designer and constructor.
2004, 34(11): 34-40.
doi: 10.13204/j.gyjz200411010
Abstract:
The inelastic analysis of a beam-column joint is highly dependent on the interaction between the rebars and the concrete.On the one hand,this is caused by the bond-slip effect particularly in the vicinity of the column face that accounts mainly for the stiffness degradation of the whole structural specimen. On the other hand,the bond stresses on the longitudinal bars also affect the shear stress in the panel directly.The proposed use of additional diagonal bars is proved effective to improve the behaviour of interior beam-column joints that are often exposed to the most unfavorable bond condition under reversed cyclic loading.It also avoids congestion of reinforcement in the panel.The presence of diagonal bars prevents the development of both joint cracks and interface cracks,which helps to maintain the stiffness of the joint. The shifting of beam plastic hinge away from the column face may protect the core concrete from yielding penetration and enhance the action of concrete strut.The reduced stresses in the longitudinal bars help to achieve less critical bond condition under the cyclic loading,especially in the lack of column axial force.
The inelastic analysis of a beam-column joint is highly dependent on the interaction between the rebars and the concrete.On the one hand,this is caused by the bond-slip effect particularly in the vicinity of the column face that accounts mainly for the stiffness degradation of the whole structural specimen. On the other hand,the bond stresses on the longitudinal bars also affect the shear stress in the panel directly.The proposed use of additional diagonal bars is proved effective to improve the behaviour of interior beam-column joints that are often exposed to the most unfavorable bond condition under reversed cyclic loading.It also avoids congestion of reinforcement in the panel.The presence of diagonal bars prevents the development of both joint cracks and interface cracks,which helps to maintain the stiffness of the joint. The shifting of beam plastic hinge away from the column face may protect the core concrete from yielding penetration and enhance the action of concrete strut.The reduced stresses in the longitudinal bars help to achieve less critical bond condition under the cyclic loading,especially in the lack of column axial force.
2004, 34(11): 41-44,26.
doi: 10.13204/j.gyjz200411011
Abstract:
The behavior of rigid pile composite foundation under horizontal load is analyzed by using elastoplastic finite element method. It is investigated that the effects of different design parameters on the horizontal forced behavior of the composite foundation, with which the distribution law of internal forces along pile subjected to horizontal load is also obtained. Calculations show that vertical load at proper level will enhance the horizontal load bearing capacity of composite foundation. Due to the effect of the cushion layer in the composite foundation, the horizontal load transferred to piles will be decreased and the pile will be safer.
The behavior of rigid pile composite foundation under horizontal load is analyzed by using elastoplastic finite element method. It is investigated that the effects of different design parameters on the horizontal forced behavior of the composite foundation, with which the distribution law of internal forces along pile subjected to horizontal load is also obtained. Calculations show that vertical load at proper level will enhance the horizontal load bearing capacity of composite foundation. Due to the effect of the cushion layer in the composite foundation, the horizontal load transferred to piles will be decreased and the pile will be safer.
2004, 34(11): 45-48.
doi: 10.13204/j.gyjz200411012
Abstract:
A stiffened DCM pile consists of soil-cement and core pile, whose cooperation has an important influence on the bearing behavior of the stiffened DCM pile. The effects of soil-cement strength and other factors on the friction resistance are researched by static loading tests of concrete core piles and soil-cement specimens, which provided a reliable basis for the design and construction of soil-cement composite piles.
A stiffened DCM pile consists of soil-cement and core pile, whose cooperation has an important influence on the bearing behavior of the stiffened DCM pile. The effects of soil-cement strength and other factors on the friction resistance are researched by static loading tests of concrete core piles and soil-cement specimens, which provided a reliable basis for the design and construction of soil-cement composite piles.
2004, 34(11): 49-53.
doi: 10.13204/j.gyjz200411013
Abstract:
Taking nine CFG piles composite foundation as an example and using ANSYS numerical analysis, the characteristics of co-action among pile cap-padding layer-pile-soil in a composite foundation of pile cluster under vertical loading are studied, and load transmission law, pile-soil stress ratio, settlement and their influence factors of the composite foundation are systematically analysed.
Taking nine CFG piles composite foundation as an example and using ANSYS numerical analysis, the characteristics of co-action among pile cap-padding layer-pile-soil in a composite foundation of pile cluster under vertical loading are studied, and load transmission law, pile-soil stress ratio, settlement and their influence factors of the composite foundation are systematically analysed.
2004, 34(11): 54-57,53.
doi: 10.13204/j.gyjz200411014
Abstract:
A mathematic model for pile-soil system is established. The method of characteristic lines to solve the stress wave equations is proposed considering the interactions of pile and soil.The optimization method can be used to quantitatively detect the faults in piles, where the soil parameters inversed from a model with complete pile are used to inverse the equivalent stress wave impedance for others with damaged piles and then identify their corresponding faults. Numerical examples of the simulation for experimental piles and of the detection for engineering piles show that the method gives the quite accurate results, especially for those with primary or secondary faults.
A mathematic model for pile-soil system is established. The method of characteristic lines to solve the stress wave equations is proposed considering the interactions of pile and soil.The optimization method can be used to quantitatively detect the faults in piles, where the soil parameters inversed from a model with complete pile are used to inverse the equivalent stress wave impedance for others with damaged piles and then identify their corresponding faults. Numerical examples of the simulation for experimental piles and of the detection for engineering piles show that the method gives the quite accurate results, especially for those with primary or secondary faults.
2004, 34(11): 58-60,84.
doi: 10.13204/j.gyjz200411015
Abstract:
It was studied that the effect of the quantity of steel slag and silica fume on concrete strength and fluidity as well as the rule of the strength of concrete with steel slag and silica fume. Adopting grade 42.5 ordinary portland cement, medium sand, 5～25mm broken stone, proper quantity of NF-2-6 retarding high effect water-reducing agent, water cementitious materials ratio 0.26, 10% of steel salg and 10% of silica fume, or water cementitious materials ratio 0.24～0.31, 10%～30% of steel slag, 15% of silica fume, C80 high performance concrete can be prepared. A reference formula for concrete commercial mix was also given.
It was studied that the effect of the quantity of steel slag and silica fume on concrete strength and fluidity as well as the rule of the strength of concrete with steel slag and silica fume. Adopting grade 42.5 ordinary portland cement, medium sand, 5～25mm broken stone, proper quantity of NF-2-6 retarding high effect water-reducing agent, water cementitious materials ratio 0.26, 10% of steel salg and 10% of silica fume, or water cementitious materials ratio 0.24～0.31, 10%～30% of steel slag, 15% of silica fume, C80 high performance concrete can be prepared. A reference formula for concrete commercial mix was also given.
2004, 34(11): 68-71,87.
doi: 10.13204/j.gyjz200411018
Abstract:
Rigid edge membrane structure has the characteristic of more succinct shape and less restrained by the project site condition;at present there are still rare projects of this kind in China.The design considerations and the detailing of the rigid edge membrane structure have been presented.An example is also given to introduce the design process of this kind of membrane structure.
Rigid edge membrane structure has the characteristic of more succinct shape and less restrained by the project site condition;at present there are still rare projects of this kind in China.The design considerations and the detailing of the rigid edge membrane structure have been presented.An example is also given to introduce the design process of this kind of membrane structure.
2004, 34(11): 72-74.
doi: 10.13204/j.gyjz200411019
Abstract:
The preventive and remedial methods of cracks in masonry buildings in China are analyzed,and especially a focal account of the concept of release is also given.Meanwhile,based on the analysis of understandings of this concept both at home and abroad,and in light of the Regulations on Masonry Building Technology that is about to promulgate,the concrete designing notion towards cracks and requirements for the rate of reinforcing bar and connectors are proposed.
The preventive and remedial methods of cracks in masonry buildings in China are analyzed,and especially a focal account of the concept of release is also given.Meanwhile,based on the analysis of understandings of this concept both at home and abroad,and in light of the Regulations on Masonry Building Technology that is about to promulgate,the concrete designing notion towards cracks and requirements for the rate of reinforcing bar and connectors are proposed.
2004, 34(11): 75-77.
doi: 10.13204/j.gyjz200411020
Abstract:
Based on the expert systems for seismic evaluation of the reinforced concrete frames(ESSEF),effective strengthening of the reinforced concrete frames could achieve notable economic and social benefits.Because not only there are few experienced engineers in seismic engineering and the engineers have different levels,but also there are many factors to be considered and lots of methods to be adopted,the strengthening effects differ greatly.ESSEF which are based on the domain expert experiences could be used to efficiently strengthen the frames and make the difficult work of strengthening to be done more conveniently to comply with the requirements of earthquake fortification.
Based on the expert systems for seismic evaluation of the reinforced concrete frames(ESSEF),effective strengthening of the reinforced concrete frames could achieve notable economic and social benefits.Because not only there are few experienced engineers in seismic engineering and the engineers have different levels,but also there are many factors to be considered and lots of methods to be adopted,the strengthening effects differ greatly.ESSEF which are based on the domain expert experiences could be used to efficiently strengthen the frames and make the difficult work of strengthening to be done more conveniently to comply with the requirements of earthquake fortification.
2004, 34(11): 78-81.
doi: 10.13204/j.gyjz200411021
Abstract:
By experiment of 23 reinforced concrete columns under eccentric loads,the strength capacity,ductility and failure modes of the columns with and without CFRP bonding are compared and analyzed.Experimental results indicate that when bounded only with longitudinal CFRP,the strength capacity of the columns increased but the ductility of the columns decreased slightly.When strengthened with transverse CFRP,the ductility of the columns improved significantly,and the ultimate strength increased as well.When strengthened by the combined action of the longitudinal and the transverse straps of CFRP,most significant improvement in the strength and the ductility of the columns resulted.On the basis of the experiment,the method of calculating the ultimate strength of eccentrically-loaded columns reinforced by longitudinal CFRP is presented,the calculating results fit well with the experimental data.
By experiment of 23 reinforced concrete columns under eccentric loads,the strength capacity,ductility and failure modes of the columns with and without CFRP bonding are compared and analyzed.Experimental results indicate that when bounded only with longitudinal CFRP,the strength capacity of the columns increased but the ductility of the columns decreased slightly.When strengthened with transverse CFRP,the ductility of the columns improved significantly,and the ultimate strength increased as well.When strengthened by the combined action of the longitudinal and the transverse straps of CFRP,most significant improvement in the strength and the ductility of the columns resulted.On the basis of the experiment,the method of calculating the ultimate strength of eccentrically-loaded columns reinforced by longitudinal CFRP is presented,the calculating results fit well with the experimental data.
2004, 34(11): 82-84.
doi: 10.13204/j.gyjz200411022
Abstract:
It is introduced that an economic and effective method of inclination-rectifying and strengthening used for a tilted building in an area of weak soil ground.
It is introduced that an economic and effective method of inclination-rectifying and strengthening used for a tilted building in an area of weak soil ground.
2004, 34(11): 85-87.
doi: 10.13204/j.gyjz200411023
Abstract:
The causes of the cracks on the walls for the library in a city are analyzed in detail according to the foundation conditions,the design of the original foundation,environmental conditions,loads and settlement deformation of the foundation etc;and the treatment recommendations on the problems are also proposed.
The causes of the cracks on the walls for the library in a city are analyzed in detail according to the foundation conditions,the design of the original foundation,environmental conditions,loads and settlement deformation of the foundation etc;and the treatment recommendations on the problems are also proposed.
2004, 34(11): 88-90,93.
doi: 10.13204/j.gyjz200411024
Abstract:
A deflection expression of a flat slab is set up according to the principle of coordination between a slab and a column,and in the light of thinking of elastic mechanics;and the distribution law of the internal forces of the flat slab is also analyzed,which provides a basis for further research on the flat slab.
A deflection expression of a flat slab is set up according to the principle of coordination between a slab and a column,and in the light of thinking of elastic mechanics;and the distribution law of the internal forces of the flat slab is also analyzed,which provides a basis for further research on the flat slab.
2004, 34(11): 91-93.
doi: 10.13204/j.gyjz200411025
Abstract:
Guangzhou has been famous forFlower City of South China.In order to better develop and expand the culture of flowers and plants with a long history in Guangzhou,the Fangcun Section of Guangzhou has the plan to develop and build the comprehensive commercial zone in the production base of Flower Fair Garden.Through the analysis in the base and combined with the features of exposition architecturing and the understanding of the flower culture,the design is done in various ways such asbionics and rhythms so that it has more qualities of the times and more local features.
Guangzhou has been famous forFlower City of South China.In order to better develop and expand the culture of flowers and plants with a long history in Guangzhou,the Fangcun Section of Guangzhou has the plan to develop and build the comprehensive commercial zone in the production base of Flower Fair Garden.Through the analysis in the base and combined with the features of exposition architecturing and the understanding of the flower culture,the design is done in various ways such asbionics and rhythms so that it has more qualities of the times and more local features.
2004, 34(11): 94-96.
doi: 10.13204/j.gyjz200411026
Abstract:
The shock isolation design of the foundation for a brick masonry residence building in Liyang is conducted.The aseismic behavior of the isolated building under earthquakcs is studied with time history analysis method.The calculation results show that the isolated building keeps elastic state under seldom occurred carthquakes and has excellent aseismic behavior.
The shock isolation design of the foundation for a brick masonry residence building in Liyang is conducted.The aseismic behavior of the isolated building under earthquakcs is studied with time history analysis method.The calculation results show that the isolated building keeps elastic state under seldom occurred carthquakes and has excellent aseismic behavior.
