Study On Seismic Behaviors Of Shear-Walls By Steel Strands Concrete

The resilient shear-wall with reinforced concrete is a new-type control structure of seismic reduction.The purposes of such structural system are to get back the using function quickly without any reparation or with little reparation,to recover people's daily life as soon as possible,to save a large amount of human and financial resources,to mitigate the serious economic loss and to give reparability to the buildings or the whole city,after earthquake.This experiment is out of the traditional design concept.The repetitive horizontal loading test was carried out on full-scale specimens that included 1 shear-wall of reinforced concrete,1 shear-wall of steel strands-reinforced concrete and 1 shear-wall with CFRP(Carbon Fiber Reinforced Plastics)bars-steel strands reinforced concrete,which was made of steel strand and CFRP bars with excellent high tensile strength.The laws that the effect of steel strand and CFRP bars in embedded columns in shear-wall with reinforced concrete on re-centering capacity of residual crack and residual deformation etc were studied,through the analysis on the bearing capacity,anti-crack behavior,hysteretic behavior,skeleton curve,ductility,stiffness,energy dissipation capacity and residual deformation etc measured in the test.The purposes of the thesis are as follows:(1)The test results indicate that the horizontal bearing capacity of the 2specimens with the steel strand and CFRP tendons can be increased continuously when the inter-story displacement rotation exceeds 2.0%,and the maximum inter-story displacement rotation is 3.0%.(2)The steel strands can reduce the residual deformation of the specimen.The residual deformation will be reduced by 50%.It is shown that the excellent linear elasticity of CFRP bars can effectively control the residual deformation of the walls,which exhibites a function of self-centering.(3)The stiffness of the shear wall is degraded.The application of steel strands and CFRP bars can slow down the reduction of the stiffness when the traditional shear-wall enters plastic strain stage.(4)The steel strands and CFRP bars can reduce the residual deformation of the specimen,improve its carrying capacity and ductility,and control the development of the crack.Compared with the traditional RC shear wall,the steel strand-reinforced concrete shear wall and CFRP Shear wall has excellent self-centering ability,which is a novel and reasonable self-centering shear wall structure type.The steel strand-reinforced concrete shear wall and CFRP Shear wall are very important for the design of seismic capacity of structure.