Experimental Study On Single-sided Superposed Shear Wall With Concealed Column And Seam

The superposed shear wall is widely used in the field of building,but people's understanding of the seismic capacity of the new single-sided superposed shear wall is still very little.In order to make the structure better popularized and used,and at the same time serve as the basis for the construction of high-rise structures,this paper performs a seismic test on a single-sided superposed shear wall with concealed column and insulation.Then compared with the cast-in-place shear wall,and simulated with Abaqus.The main conclusions are as follows:1.The failure mode of single-sided superposed shear wall is bending shear failure,the main feature is concrete crushing.The main cracks of single-sided laminated plate shear wall include horizontal cracks and X-shaped cracks,and the seam has high bearing capacity.Rectangular concealed column and the prefabricated wall panel work together as a whole,which can transfer the force well.2.Comparing the hysteresis curve,skeleton curve,stiffness degradation curve and ductility and energy dissipation capacity,it can be concluded that the various data of the three shear walls are similar,and the single-sided superposed shear wall has excellent seismic performance.3.The numerical simulation results of the finite element software Abaqus for a singlesided superposed shear wall are in good agreement with the test.The final failure form of the shear wall is basically similar to the crack distribution,and the hysteresis curve and the skeleton curve are roughly the same.It shows that the method of finite element simulation in this paper is reliable and can be used for subsequent analysis of seismic performance parameters of single-sided superposed shear wall.4.According to the simulation,as the axial compression ratio increases,the cracking load,yield load,and ultimate load of the shear wall gradually increase.Reinforced mesh bears more uniform force,the damage at the vertical seam is more and more serious,and the stress on the concealed column is getting smaller and smaller.The tensile damage of concrete decreases,the damage of compression increases,and the concrete damage at the bottom of the shear wall becomes more and more serious,basically broken.The ductility is improved by 13% when the axial compression ratio is changed from 0.1 to 0.2,but when the axial compression ratio is changed from 0.2 to 0.3,the ductility is reduced by 26%,so it is very important to choose the axial compression ratio.5.According to the simulation,as the concrete grade increases,the cracking load,yield load,and ultimate load of the shear wall gradually increase.When the concrete grade is changed from C30 to C45,the ductility is reduced by 40%,and when it is changed from C45 to C60,the ductility is reduced by 13%.It can be seen that the increase in concrete grade greatly increases the brittleness of the component,which will accelerate the failure of the component to a certain extent,so it is very important to choose the concrete grade reasonably.6.According to the simulation,it can be seen that the concealed column goes from scratch to encryption,the bearing capacity of the wall panel is improved,and it is evenly distributed.In terms of ultimate load,the densified concealed columns are 6% higher than the normal ones,and the normal concealed columns are 9% higher than the ones not set.Therefore,it is beneficial to place the concealed columns in the members.Figure [60] table [13] reference [63]...