| In this paper,the high-rise residential building with shear wall structure in Taiyuan is taken as the research object,and a model is established to simulate and calculate the earthquake action by software.Different shear wall layout schemes are compared and analyzed,and the regularity and over-limit of the structure are summarized.According to the over-limit degree,the specific seismic performance design objectives are formulated,and the seismic performance design of fortification intensity earthquake and rare earthquake is carried out.The MIDAS Building finite element analysis software is used to analyze the dynamic elastoplastic time history of the structure under rare earthquake and extremely rare earthquake,which further verifies the seismic performance of the structure.The main work accomplished is as follows:(1)Comparing two different shear wall layout schemes,the torsional stiffness and lateral stiffness of the second shear wall layout scheme are better than those of the first shear wall layout scheme,eliminating the irregular items with displacement ratio greater than 1.2,and choosing the second shear wall layout scheme.(2)The structural analysis software with two different mechanical models is used to calculate and analyze the structure under frequent earthquakes.PKPM is used as the main calculation and analysis software,MIDAS is used as the auxiliary software for analysis and verification.The reliability of the calculation model is verified by comparing the structural total mass,bottom shear and overturning moment,period,torsional displacement ratio and displacement angle of two different software models,and the period ratio and torsional displacement ratio obtained from the analysis are analyzed.The irregular items of the structure are checked one by one,and it is found that the structure is a high-rise structure with over-limit aspect ratio,over-limit structure height and complex connection.According to the specific over-limit conditions and positions,the feasible structural seismic performance targets are formulated.(3)In this paper,the model above the embedded parts is established and analyzed.According to the seismic performance objectives,the seismic performance of typical members is analyzed,and the analysis results are envelope designed to obtain the final reinforcement of the members.Under the seismic action of fortification intensity,the shear wall meets the requirements of shear elasticity,bending and non-yielding,and some external walls have tensile force.The seismic grade of the wall with tensile stress is improved to special level.Based on the assumption of elastic floor,the stress analysis of staggered floor is carried out,and the structural measures of increasing plate thickness and reinforcement ratio are taken to strengthen it according to the analysis results.Under rare earthquake,the shear wall does not yield in shear and bending,and the shear of the coupling beam meets the section control conditions.(4)Using the finite element analysis software MIDAS-Building,the dynamic elastoplastic time history analysis of rare earthquake and extremely rare earthquake is carried out to analyze the deformation of the structure,the damage of each component and the elastoplastic change trend of the whole structure under the action of strong earthquake,focusing on the maximum vertex displacement,the maximum bottom shear force and other indicators,and comparing and analyzing the actual seismic capacity and performance targets after earthquake response,so as to measure and judge whether the structure meets the expected seismic requirements.Under rare earthquake action,the overall elastic-plastic interlayer displacement angle of the structure meets the basic requirement of less than 1/120,and the plastic deformation failure position and plastic hinge elastic-plastic state of the structure show that the overall mechanical performance of the structure under rare earthquake action of given seismic wave is good,with good energy dissipation capacity and ductility,which can meet the seismic design requirements under rare earthquake.Under rare earthquake,shear wall concrete is damaged under tension and compression,and a large number of shear walls are damaged by shear and enter the working state with cracks,and some shear walls enter the limit state.The shear walls entering the cracking state are mostly in the bottom strengthening area.In addition,most of the shear walls entering the limit state are concentrated in the coupling beam. |
