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2005 Vol. 35, No. 9
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2005, 35(9): 1-4,37.
doi: 10.13204/j.gyjz200509001
Abstract:
As a new strutural material to be used in building constructions and bridge constructions, FRP composites have received increasing interests in recent years. The advantages of utilizing FRP in engineering over conventional materials are summarized as, lightweight, high tensile strength, corrosion immunity and high fatigue strength. The application and research of FRP composites in civil engineering are reviewed briefly. Several key issues of FRP-confined concrete column,which are worth to research further are discussed.
As a new strutural material to be used in building constructions and bridge constructions, FRP composites have received increasing interests in recent years. The advantages of utilizing FRP in engineering over conventional materials are summarized as, lightweight, high tensile strength, corrosion immunity and high fatigue strength. The application and research of FRP composites in civil engineering are reviewed briefly. Several key issues of FRP-confined concrete column,which are worth to research further are discussed.
2005, 35(9): 5-7,28.
doi: 10.13204/j.gyjz200509002
Abstract:
A total of eight specimens with slenderness ratio of 20.4 were tested to investigate the performance of eccentrically loaded square reinforced concrete (RC) columns. These eight columns included four unstrengthened columns, and four columns strengthened by FRP jackets. The main parameter varied in the tests was the load eccentricity. The experimental results demonstrated that the bearing capacities can not be enhanced effectively, but the ductility can be improved to some extent,especially for specimens with small eccentricities. If there is a need to enhance both bearing capacity and ductility of square RC long column, it is recommended that bi-directional FRP sheets should be used, or some other effective measures should be taken.
A total of eight specimens with slenderness ratio of 20.4 were tested to investigate the performance of eccentrically loaded square reinforced concrete (RC) columns. These eight columns included four unstrengthened columns, and four columns strengthened by FRP jackets. The main parameter varied in the tests was the load eccentricity. The experimental results demonstrated that the bearing capacities can not be enhanced effectively, but the ductility can be improved to some extent,especially for specimens with small eccentricities. If there is a need to enhance both bearing capacity and ductility of square RC long column, it is recommended that bi-directional FRP sheets should be used, or some other effective measures should be taken.
2005, 35(9): 8-10,41.
doi: 10.13204/j.gyjz200509003
Abstract:
Based on theoretical analysis of mechanical property of FRP-confined concrete beam-column with circular section,the deformation characteristics of the beam-column under long-term load are studied.Parameter analysis is performed to determine the main influencing factors.
Based on theoretical analysis of mechanical property of FRP-confined concrete beam-column with circular section,the deformation characteristics of the beam-column under long-term load are studied.Parameter analysis is performed to determine the main influencing factors.
2005, 35(9): 11-14.
doi: 10.13204/j.gyjz200509004
Abstract:
Four circular R.C.columns confined with fiber-reinforced polymer (FRP) jackets and three circular R.C.columns were tested under constant axial load and cyclically increasing flexural loading.The main parameters in the test are axial compressive ratio and FRP ratio,and the influences of those parameters on the strength,ductility,stiffness,and energy dissipation are also investigated through analysis of hysteretic skeleton curves.
Four circular R.C.columns confined with fiber-reinforced polymer (FRP) jackets and three circular R.C.columns were tested under constant axial load and cyclically increasing flexural loading.The main parameters in the test are axial compressive ratio and FRP ratio,and the influences of those parameters on the strength,ductility,stiffness,and energy dissipation are also investigated through analysis of hysteretic skeleton curves.
2005, 35(9): 15-19.
doi: 10.13204/j.gyjz200509005
Abstract:
Based on the stress-strain models of FRP,steel bar and the confined concrete under cyclic loading,theoretical model for the analysis of moment-curvature and load-deflection relationship was put forward.The calculating results of the theoretical model are in good agreement with the test results.Based on the theoretical model,parametric analysis was performed to determine effects on the behavior of lateral load (P) versus lateral deflection () response.The parameters include:FRP ratio,steel strength,steel ratio,compressive strength of concrete,axial compression ratio and slenderness ratio.Simplified hysteretic models are recommended.
Based on the stress-strain models of FRP,steel bar and the confined concrete under cyclic loading,theoretical model for the analysis of moment-curvature and load-deflection relationship was put forward.The calculating results of the theoretical model are in good agreement with the test results.Based on the theoretical model,parametric analysis was performed to determine effects on the behavior of lateral load (P) versus lateral deflection () response.The parameters include:FRP ratio,steel strength,steel ratio,compressive strength of concrete,axial compression ratio and slenderness ratio.Simplified hysteretic models are recommended.
2005, 35(9): 20-23.
doi: 10.13204/j.gyjz200509006
Abstract:
Nine tests on short concrete-filled steel tubes (CFST) were carried out,including six specimens wrapped by fiber reinforced polymers (FRP) and three unwrapped ones.The experimental parameters were sectional shape,section size and layers of FRP jackets.The test results demonstrated that,the FRP-confined concrete-filled steel tubular stub columns with circular sections have the merits of both FRP-confined concrete and CFST stub columns.A simple formula,which can be used for calculating bearing capacities of FRP-confined concrete-filled steel tubular stub columns with circular sections is established.
Nine tests on short concrete-filled steel tubes (CFST) were carried out,including six specimens wrapped by fiber reinforced polymers (FRP) and three unwrapped ones.The experimental parameters were sectional shape,section size and layers of FRP jackets.The test results demonstrated that,the FRP-confined concrete-filled steel tubular stub columns with circular sections have the merits of both FRP-confined concrete and CFST stub columns.A simple formula,which can be used for calculating bearing capacities of FRP-confined concrete-filled steel tubular stub columns with circular sections is established.
2005, 35(9): 24-28.
doi: 10.13204/j.gyjz200509007
Abstract:
By the axial compression tests of total of 6 reinforced concrete slender columns wrapped with fiber reinforced plastics(the column has elliptical section and slenderness ratio is from 4.5～17.15),the influence of slenderness on the stable bearing capacity of the column is studied.The results indicate:slenderness has more influence on the stable bearing capacity of FRP confined concrete column than RC column,when slenderness ratio is less than 17.5,the stable bearing capacity of FRP confined concrete column is still 20% higher than that of the RC column(confined ratio =0.188).Some factors that maybe influence stable factor are also discussed.At last,the simplified calculating formulas of stable factor are summarized,which can provide a reference for engineering designer.
By the axial compression tests of total of 6 reinforced concrete slender columns wrapped with fiber reinforced plastics(the column has elliptical section and slenderness ratio is from 4.5～17.15),the influence of slenderness on the stable bearing capacity of the column is studied.The results indicate:slenderness has more influence on the stable bearing capacity of FRP confined concrete column than RC column,when slenderness ratio is less than 17.5,the stable bearing capacity of FRP confined concrete column is still 20% higher than that of the RC column(confined ratio =0.188).Some factors that maybe influence stable factor are also discussed.At last,the simplified calculating formulas of stable factor are summarized,which can provide a reference for engineering designer.
2005, 35(9): 29-31,19.
doi: 10.13204/j.gyjz200509008
Abstract:
The conditions of practice and theory research,the new requests and changes of residents in designing of the housing dwelling size are analyzed.Then the tendencies and the corresponding design countermeasures of the housing dwelling size are also probed.
The conditions of practice and theory research,the new requests and changes of residents in designing of the housing dwelling size are analyzed.Then the tendencies and the corresponding design countermeasures of the housing dwelling size are also probed.
2005, 35(9): 32-34.
doi: 10.13204/j.gyjz200509009
Abstract:
Aiming at the condition that cybernated draft technology has not been widely and thoroughly applied in architecture design, the advantages of cybernated draft technology have been displayed through comparing it with artificial draft and working model. The possibility and reasonableness of cybernated draft have been further analyzed.
Aiming at the condition that cybernated draft technology has not been widely and thoroughly applied in architecture design, the advantages of cybernated draft technology have been displayed through comparing it with artificial draft and working model. The possibility and reasonableness of cybernated draft have been further analyzed.
2005, 35(9): 35-37.
doi: 10.13204/j.gyjz200509010
Abstract:
Whether calculating the load of heating or cooling,it is generally neglected that the contribution of nocturnal radiation to the thermal surroundings of buildings.However,is there exactly no impact?Or even it exists,is it so weak that we may ignore it?Which have been researched deeply.
Whether calculating the load of heating or cooling,it is generally neglected that the contribution of nocturnal radiation to the thermal surroundings of buildings.However,is there exactly no impact?Or even it exists,is it so weak that we may ignore it?Which have been researched deeply.
2005, 35(9): 38-41.
doi: 10.13204/j.gyjz200509011
Abstract:
Based on the high theory of reinforced concrete,the all course analysis of normal section under load for the steel fiber reinforced concrete flexural members is researched.With the thickness of steel fiber reinforced concrete layer,the unified calculating method is put forward, which is suitable for the normal reinforced concrete flexural members,the steel fiber reinforced partial concrete flexural members and the steel fiber reinforced whole concrete flexural members.Furthermore, the unified all course analysis programme is made.
Based on the high theory of reinforced concrete,the all course analysis of normal section under load for the steel fiber reinforced concrete flexural members is researched.With the thickness of steel fiber reinforced concrete layer,the unified calculating method is put forward, which is suitable for the normal reinforced concrete flexural members,the steel fiber reinforced partial concrete flexural members and the steel fiber reinforced whole concrete flexural members.Furthermore, the unified all course analysis programme is made.
2005, 35(9): 42-45.
doi: 10.13204/j.gyjz200509012
Abstract:
The performances, such as energy dissipation, strength and stiffness etc of a reinforced concrete column have been studied by six kinds of loading systems. The test study proves that the different loading systems have a great influence on the aseismic performance of the reinforced concrete column.
The performances, such as energy dissipation, strength and stiffness etc of a reinforced concrete column have been studied by six kinds of loading systems. The test study proves that the different loading systems have a great influence on the aseismic performance of the reinforced concrete column.
2005, 35(9): 46-49,104.
doi: 10.13204/j.gyjz200509013
Abstract:
It was analyzed that some features of the underpinning structures of pile -beam and pile -raft, and the design methods of these structures were also explored deeply,which can be referred to in the design of other similar projects.
It was analyzed that some features of the underpinning structures of pile -beam and pile -raft, and the design methods of these structures were also explored deeply,which can be referred to in the design of other similar projects.
2005, 35(9): 50-53.
doi: 10.13204/j.gyjz200509014
Abstract:
Considering the coupled action of soil, underground pipelines, shield shell and tunnel lining, with software of ANSYS, a three dimensional finite element method is used to analyze the displacements of underground pipelines caused by shield construction. Displacements of underground pipelines affected by the propelling force of shield, distance between working face of shield and pipelines as well as injected slurry etc are studied.
Considering the coupled action of soil, underground pipelines, shield shell and tunnel lining, with software of ANSYS, a three dimensional finite element method is used to analyze the displacements of underground pipelines caused by shield construction. Displacements of underground pipelines affected by the propelling force of shield, distance between working face of shield and pipelines as well as injected slurry etc are studied.
2005, 35(9): 54-59,63.
doi: 10.13204/j.gyjz200509015
Abstract:
In a 238m high and 60-storey super-tall building with 10-storey podium, excavation depth of 18.95～24.00m and an area of 22 000m2 in Shanghai, based on the theoretical concept and experience, it has been analyzed that a great deal of monitoring results for horizontal displacements, heave in pit bottom, differential displacements between diaphragm wall and adjacent mid-post pile and between mid-post piles, earth pressure and stress in diaphragm wall for special deep and big excavation, and five characteristics of stress and displacement for up-down construction method differing with normal construction method have also been obtained. Some suggestions on improving the design of up-down construction method for deep excavation engineering are presented, which may be a reference for other similar projects.
In a 238m high and 60-storey super-tall building with 10-storey podium, excavation depth of 18.95～24.00m and an area of 22 000m2 in Shanghai, based on the theoretical concept and experience, it has been analyzed that a great deal of monitoring results for horizontal displacements, heave in pit bottom, differential displacements between diaphragm wall and adjacent mid-post pile and between mid-post piles, earth pressure and stress in diaphragm wall for special deep and big excavation, and five characteristics of stress and displacement for up-down construction method differing with normal construction method have also been obtained. Some suggestions on improving the design of up-down construction method for deep excavation engineering are presented, which may be a reference for other similar projects.
2005, 35(9): 60-63.
doi: 10.13204/j.gyjz200509016
Abstract:
The numerical simulations of bearing capacity of bored piles before and after grouting of a project by FEM are presented. The calculation results are better fit to the measurement results. The effects of post-grouting on bearing capacity are simulated introducing the radius and strength of grouted soil body. The results show the effect of grouting volume on the bearing capacity is large and the bearing capacity of bored piles is linearly increased with the increase of the radius of the grouted soil body. The effect of the strength of grouted soil on the bearing capacity is limited and the critical strength value of grouted soil exists, the effect of the increase of strength on the bearing capacity is very slight after the strength is over the critical value.
The numerical simulations of bearing capacity of bored piles before and after grouting of a project by FEM are presented. The calculation results are better fit to the measurement results. The effects of post-grouting on bearing capacity are simulated introducing the radius and strength of grouted soil body. The results show the effect of grouting volume on the bearing capacity is large and the bearing capacity of bored piles is linearly increased with the increase of the radius of the grouted soil body. The effect of the strength of grouted soil on the bearing capacity is limited and the critical strength value of grouted soil exists, the effect of the increase of strength on the bearing capacity is very slight after the strength is over the critical value.
2005, 35(9): 64-66,45.
doi: 10.13204/j.gyjz200509017
Abstract:
It is described a laboratory investigation on the resistance to freezing and thawing of recycled aggregate concrete (RAC).Comparing with the natural aggregate concrete (NAC) in the weight loss,the dynamic modulus of elasticity decrease and the strength,it is found that RAC is as durable as NAC.Especially,the durability of RAC by the design method of increasing cement paste is the most durable among the three kinds,even more durable than NAC.According to the result of the experiment,the strength reduction is used as the criterion of the freeze-thaw durability of RAC,besides the weight-loss and the decrease of dynamic modulus of elasticity.
It is described a laboratory investigation on the resistance to freezing and thawing of recycled aggregate concrete (RAC).Comparing with the natural aggregate concrete (NAC) in the weight loss,the dynamic modulus of elasticity decrease and the strength,it is found that RAC is as durable as NAC.Especially,the durability of RAC by the design method of increasing cement paste is the most durable among the three kinds,even more durable than NAC.According to the result of the experiment,the strength reduction is used as the criterion of the freeze-thaw durability of RAC,besides the weight-loss and the decrease of dynamic modulus of elasticity.
2005, 35(9): 67-69.
doi: 10.13204/j.gyjz200509018
Abstract:
It was investigated that the effect of expansive agent dosage,water -binder ratio(W/B),air -entraining admixture and curing regime on the shrinkage and impermeability of C40 self -compacting concrete.The results showed that the airentraining admixture could greatly reduce shrinkage and enhance impermeability,the shrinkage and impermeability were affected by W/B and self -compacting competency,the optimum expanding admixture dosage was 30 kg/m +3.As for the reliability of self-compacting concrete in engineering,the shrinkage and deformation fall acted for a supplement of standard permeability test to estimate the impermeability of self-compacting concrete.
It was investigated that the effect of expansive agent dosage,water -binder ratio(W/B),air -entraining admixture and curing regime on the shrinkage and impermeability of C40 self -compacting concrete.The results showed that the airentraining admixture could greatly reduce shrinkage and enhance impermeability,the shrinkage and impermeability were affected by W/B and self -compacting competency,the optimum expanding admixture dosage was 30 kg/m +3.As for the reliability of self-compacting concrete in engineering,the shrinkage and deformation fall acted for a supplement of standard permeability test to estimate the impermeability of self-compacting concrete.
2005, 35(9): 70-71,75.
doi: 10.13204/j.gyjz200509019
Abstract:
In the process of construction of concrete structure,the principle of replacing reinforcement with equal intensity is often used to replace the stressed reinforcements.According to the national standardCode for Design of Concrete Structures(GB 50010-2002),it was analyzed the effect of reinforcements diameter,shape,type and intensity on the stiffness,crack,anchorage,transferring of prestressing force and failure form of a structural member.It indicated that attentiona should be paid to replacing reinforcement in construction,and it should be conducted the document of design change according to demands on the national standardCode for Acceptance of Constructional Quality of Concrete Structures(GB 50204-2002).
In the process of construction of concrete structure,the principle of replacing reinforcement with equal intensity is often used to replace the stressed reinforcements.According to the national standardCode for Design of Concrete Structures(GB 50010-2002),it was analyzed the effect of reinforcements diameter,shape,type and intensity on the stiffness,crack,anchorage,transferring of prestressing force and failure form of a structural member.It indicated that attentiona should be paid to replacing reinforcement in construction,and it should be conducted the document of design change according to demands on the national standardCode for Acceptance of Constructional Quality of Concrete Structures(GB 50204-2002).
2005, 35(9): 72-75.
doi: 10.13204/j.gyjz200509020
Abstract:
Based on analysis of design of Renault Delivery Center and Industrial Facility at Fondotoce,comment on two aesthetic trends of technocracy and historicism is done which is useful to improve the quality of our design through paying much attention to the study of industrial architecture aesthetics.
Based on analysis of design of Renault Delivery Center and Industrial Facility at Fondotoce,comment on two aesthetic trends of technocracy and historicism is done which is useful to improve the quality of our design through paying much attention to the study of industrial architecture aesthetics.
2005, 35(9): 76-79.
doi: 10.13204/j.gyjz200509021
Abstract:
FRP is a newly advanced composite material, whose convenient construction technique and excellent rehabilitation effect are generally agreeable by the circles of civil engineering. The studies on FRP strengthened building are one of leading issues on the field of civil engineering, but domestic research on this field is carried out lately especially on masonry walls. Based on a large quantities of latest relative documents, flexural capacity of FRP strengthened masonry walls are summarized, and some issues needed to be studied are also presented.
FRP is a newly advanced composite material, whose convenient construction technique and excellent rehabilitation effect are generally agreeable by the circles of civil engineering. The studies on FRP strengthened building are one of leading issues on the field of civil engineering, but domestic research on this field is carried out lately especially on masonry walls. Based on a large quantities of latest relative documents, flexural capacity of FRP strengthened masonry walls are summarized, and some issues needed to be studied are also presented.
2005, 35(9): 80-83.
doi: 10.13204/j.gyjz200509022
Abstract:
Integral hoisting is employed in the construction of No.10 hangar of China Southern Airline. As the main support members during the process of integral hoisting, the steel -concrete composite columns are loaded almost eccentrically and they are formed by steel latticed columns and concrete rectangle_section columns, Because of few researches on the stability of the composite columns up to now, their stability analysis is focused mainly on the study. A FEM associated Code for Design of Steel Structures(GB 50017-2003) is presented, where the critical loads of the composite columns are determined by FEM, and global stability check is carried out according to the code. In addition, the full load_displacement curves of composite columns are achieved by using a large_deflection plastic FEM, and from these curves the load_carrying capacity and stiffness requirements of the composite columns can be evaluated correctly. It is approved by the construction practice that the steel-concrete composite columns do work very well and the integral hoisting has been accomplished safely.
Integral hoisting is employed in the construction of No.10 hangar of China Southern Airline. As the main support members during the process of integral hoisting, the steel -concrete composite columns are loaded almost eccentrically and they are formed by steel latticed columns and concrete rectangle_section columns, Because of few researches on the stability of the composite columns up to now, their stability analysis is focused mainly on the study. A FEM associated Code for Design of Steel Structures(GB 50017-2003) is presented, where the critical loads of the composite columns are determined by FEM, and global stability check is carried out according to the code. In addition, the full load_displacement curves of composite columns are achieved by using a large_deflection plastic FEM, and from these curves the load_carrying capacity and stiffness requirements of the composite columns can be evaluated correctly. It is approved by the construction practice that the steel-concrete composite columns do work very well and the integral hoisting has been accomplished safely.
2005, 35(9): 84-85,93.
doi: 10.13204/j.gyjz200509023
Abstract:
The numerical method is applied to simulate the load-deformation curve of steel tubular column filled with steel-reinforced high-strength concrete subjected to compression and bending. The numerical results are verified by experimental data. Based on the numerical results, the major factors influencing load-bearing capacity of the composite column subjected to compression and bending are studied, and formulas for predicting load-bearing capacity of the composite column are proposed.
The numerical method is applied to simulate the load-deformation curve of steel tubular column filled with steel-reinforced high-strength concrete subjected to compression and bending. The numerical results are verified by experimental data. Based on the numerical results, the major factors influencing load-bearing capacity of the composite column subjected to compression and bending are studied, and formulas for predicting load-bearing capacity of the composite column are proposed.
2005, 35(9): 86-89.
doi: 10.13204/j.gyjz200509024
Abstract:
Adhesive joint,as an important method of joint,has been widely used in the construction.To study the mechanical behavior of the steel members jointed by cementation,five short columns under axial loads,five columns under eccentric loads,one beam under moment load are tested.The test schemes and the main test results are introduced.It is analyzed that the effect of cementation on the mechanical behavior,ultimate bearing capacity,failure modes and deformation distribution.Differences between adhesive failure and structural failure are told.And some concerned conclusions are drawn.
Adhesive joint,as an important method of joint,has been widely used in the construction.To study the mechanical behavior of the steel members jointed by cementation,five short columns under axial loads,five columns under eccentric loads,one beam under moment load are tested.The test schemes and the main test results are introduced.It is analyzed that the effect of cementation on the mechanical behavior,ultimate bearing capacity,failure modes and deformation distribution.Differences between adhesive failure and structural failure are told.And some concerned conclusions are drawn.
2005, 35(9): 90-93.
doi: 10.13204/j.gyjz200509025
Abstract:
By quasi-static test and finite element ALGOR program, it has been done that the experimental research under low-cycle repeating horizontal load, non-linear finite element analysis.And the damage form and mechanical performance of T-joint have been studied. The results of analysis indicate that T-joint has better ductility, the difference of the rigidity of flange has great influence on ductility;the shapes of P- curve are stable and full, T-joint has perfect seismic performance;the thickness of flange has great influence on the strength of T-joint.
By quasi-static test and finite element ALGOR program, it has been done that the experimental research under low-cycle repeating horizontal load, non-linear finite element analysis.And the damage form and mechanical performance of T-joint have been studied. The results of analysis indicate that T-joint has better ductility, the difference of the rigidity of flange has great influence on ductility;the shapes of P- curve are stable and full, T-joint has perfect seismic performance;the thickness of flange has great influence on the strength of T-joint.
2005, 35(9): 94-96.
doi: 10.13204/j.gyjz200509026
Abstract:
Based on numerical analysis,an explicit rotation-deflection relation of tapered members is presented. The rotational restraints of beams to columns are derived when the portal frame buckles in a non-sway mode. The beams may be composed of multiple segments of tapered members. These restraints are intended for an easier determination of the column effective length both in manual calculation and computer software.
Based on numerical analysis,an explicit rotation-deflection relation of tapered members is presented. The rotational restraints of beams to columns are derived when the portal frame buckles in a non-sway mode. The beams may be composed of multiple segments of tapered members. These restraints are intended for an easier determination of the column effective length both in manual calculation and computer software.
2005, 35(9): 97-100,96.
doi: 10.13204/j.gyjz200509027
Abstract:
The strong shear weak bending design reliability of RC column and sensitivity thereof on random variables under earthquake action are calculated. The influence of section dimensions, reinforcements areas and hoop reinforcements areas and shear-enlarged coefficients on reliability and sensitivity thereof is investigated. The results indicate that strong shear weak bending design reliability, which cant be ensured by shear-enlarged coefficients taken in the current design code, is very sensitive on calculating model of shear-resistance and concrete fiexural strength. So the calculating model of shear-resistance taken in the current design code is necessary to be perfected and the statistical characters of concrete flexural strength should be more accurate.
The strong shear weak bending design reliability of RC column and sensitivity thereof on random variables under earthquake action are calculated. The influence of section dimensions, reinforcements areas and hoop reinforcements areas and shear-enlarged coefficients on reliability and sensitivity thereof is investigated. The results indicate that strong shear weak bending design reliability, which cant be ensured by shear-enlarged coefficients taken in the current design code, is very sensitive on calculating model of shear-resistance and concrete fiexural strength. So the calculating model of shear-resistance taken in the current design code is necessary to be perfected and the statistical characters of concrete flexural strength should be more accurate.
2005, 35(9): 101-104.
doi: 10.13204/j.gyjz200509028
Abstract:
The research on the application of carbon fiber sheets to structural projects is causing the concern of the civil engineering circles in China. This material is started to be used for strengthenings. The study on using CFRP as the reinforcements for concrete structures is very few and there is no case history of its use at home. The anchorage method and test technique of concrete structures with prestressed CFRP are explored by combining recent experience in researches and taking the flight bridge for a club in Japan for example.
The research on the application of carbon fiber sheets to structural projects is causing the concern of the civil engineering circles in China. This material is started to be used for strengthenings. The study on using CFRP as the reinforcements for concrete structures is very few and there is no case history of its use at home. The anchorage method and test technique of concrete structures with prestressed CFRP are explored by combining recent experience in researches and taking the flight bridge for a club in Japan for example.
2005, 35(9): 105-106.
doi: 10.13204/j.gyjz200509029
Abstract:
A comparative experimental study showed that silane coupling agent solution can significantly increase the bond strength of new to old concrete repair interfacial layer. A primary modifying mechanism for explaining this phenomenon is proposed: it is possible for silane coupling agent to create many chemical bonds between cement paste surface and granite (old mortar) surface.
A comparative experimental study showed that silane coupling agent solution can significantly increase the bond strength of new to old concrete repair interfacial layer. A primary modifying mechanism for explaining this phenomenon is proposed: it is possible for silane coupling agent to create many chemical bonds between cement paste surface and granite (old mortar) surface.
2005, 35(9): 107-108,79.
doi: 10.13204/j.gyjz200509030
Abstract:
It is described that the current situation and problems of Wuhan commercial house by means of investigating, analyzing and introducing the splendid residential house types of Chutian Homes Tead. Meanwhile, It is also explored the direction of the design of Wuhan residential house types.
It is described that the current situation and problems of Wuhan commercial house by means of investigating, analyzing and introducing the splendid residential house types of Chutian Homes Tead. Meanwhile, It is also explored the direction of the design of Wuhan residential house types.
