| Composite shear wall with double steel plates and infilling concrete is a new type of shear wall with excellent seismic performance,which has a broad prospect in high-rise buildings.The cross section of the more common composite shear wall with double steel plate and infilling concrete is rectangular.But sometimes special-shaped section members are used in accordance with the requirements of building use.The seismic behavior of composite shear wall with double steel plates and infilling concrete with cross-section of rectangular varies with the connection structure between the double steel plates and between the steel plate and the infilling concrete.Chinese and foreign scholars have made a comprehensive study on the seismic performance of composite shear wall with double steel plate and infilling concrete with rectangular section,including experimental study,theoretical analysis,finite element analysis,and obtained many valuable conclusions.But at present,there is little research on the special-shaped composite shear wall with double steel plates and infilling concrete in china or abroad.Only a few scholars have carried out experimental research and finite element analysis on the T-shaped composite shear wall with double steel plates and infilling concrete.So far,there is no experimental study or finite element analysis on the seismic performance of L-shaped composite shear wall with double steel plates and infilling concrete.In order to study the seismic behavior of composite shear wall with double steel plates and infilling concrete with L-shaped section,the low-cycle cyclic loading test and the numerical simulation analysis based on ABAQUS are carried out.(1)Two specimens of L-shaped composite shear wall with double steel plates and infilling concrete were designed and manufactured.One of the specimens was strengthened at the end of the web,and the two specimens were subjected to cyclic loading tests.The hysteresis curves,skeleton curves,stiffness degradation curves,strength degradation curves and extension curves of the two L-shaped double-steel-plates shear walls was obtained.At the same time,two L-section composite shear wall with double steel plates and infilling concrete with end-strengthened and without end-strengthened are compared.The comparison shows that the seismic performance of L-section composite shear wall with double steel plates and infilling concrete with end-strengthened is much better than that of composite shear wall with double steel plate and infilling concrete without end-strengthened.(2)Then,based on the test results,an accurate finite element model is established by using reasonable constitutive models,effective constraints and correct boundary conditions and adding initial imperfections to the model.The simulation results are compared with the experimental results to verify the correctness of the finite element model.The failure mode of L section composite shear wall with double steel plate and infilling concrete walls is analyzed.(3)Based on the correct finite element model of composite shear wall with double steel plates and infilling concrete,16 finite element models with different parameters are simulated.By comparing the skeleton curves of each model,the concrete influence of each parameter on the seismic performance of L-shaped double-plate shear wall is analyzed.The main analysis parameters are the width of flange wall,the number of end reinforcement,the size of end reinforcement,the thickness of outer steel plate and the axial compression ratio.The results show that with the increase of flange width,the positive bearing capacity increases faster than the negative bearing capacity;the higher the steel content at the end of the L-shaped double-plate composite shear wall,the more favorable its seismic performance;the thicker the outer steel plate,the more favorable the L-shaped double-plate composite shear wall.The ductility of the force wall is better range.,and the axial compression ratio of the L-shaped double steel plate composite shear wall should be controlled in a certain. |
