Simulation Analysis On Lateral-Resisting Capacity Of RC Frame-Shear With Performance-Based Design Under The Scenario Of Floor Openings And Varying Stiffness Characteristics

RC frame-shear wall structure frame and shear wall are different in the elastic stage due to the different limit values of the elastic interlayer displacement angle(the seismic wall is much smaller than the frame),and the time to enter the elastoplastic stage will be different.This inevitably causes different levels of degradation of the frame and shear wall side stiffness.The presence of the slab provides an extremely efficient shear path for the frame and shear walls to help them work together.In this paper,the finite element simulation analysis of a space frame shear structure is firstly carried out to demonstrate the feasibility and accuracy of the nonlinear finite element analysis program based on the three-dimensional solid degenerate virtual merging unit theory.Through the simulation analysis of the influence of the slab opening based on the performance target on the anti-side performance of the RC frame-shear wall,the top load displacement curves and the shear force redistribution curves of the frame-shear wall structure simulation analysis under the slab opening are compared and analyzed.Analyze the damage of the frame-shear wall and the phenomenon of redistribution of shear force and the law in the case of floor slab opening.The analysis shows that the frame-shear wall structure floor slab makes the ultimate load and the maximum horizontal displacement of the structure decrease,which makes the overall ductility of the structure worse.The stiffness degradation of the frame in the open hole layer is more serious than that of the unopened structure,resulting in the bottom layer of the structure.The shear redistribution phenomenon is weaker than the non-opening structure.On the basis of the opening of the floor,the influence of the stiffness characteristic value on the structure is added.The load-displacement curve and the shear force redistribution curve of the RC frame-shear wall structure based on performance-based design under different stiffness eigenvalues are compared and analyzed.The different stiffness eigenvalues of the slab opening model are analyzedin detail.The influence of the horizontal ultimate load and structural ductility of the structure and the shear redistribution law under the ultimate load are expressed from different parts.The larger the stiffness characteristic value is,the larger the ultimate load and the maximum horizontal displacement are,and the ductility of the structure is improved.For the shear redistribution,for the model with the stiffness characteristic value within a certain range,the structural shear force is heavy.The distribution law is roughly the same.Under the ultimate load,the total frame shear force distribution coefficient shows the law of increasing first and then decreasing.When the stiffness characteristic value is small,the frame part is too soft and the bottom frame shear force distribution is smaller.