Contrast Studies Of Commonly Used Static Elasto-plastic Analysis Software In Pushover Analysis Of Building Structure

《Code for seismic design of buildings》(GB50011-2010) determine the form of standardized that is based on performance seismic design method for the first time, seismic bearing capacity and plastic deformation of component has been used as control target under seismic action. The structures in high nonlinear state under rare earthquake,how to ensure that the building structure meet seismic performance is very important in aseismic design.Estimating quantificationally energy dissipation and bearing capacity of the structure is main means for seismic performance design by static elasto-plastic analysis.This paper mainly use capacity spectrum method to evaluat seismic performance of building structures.The main topics are included:(1) Comparing calculation model with test model. Top displacement-shear curve of pushover analysis method and the pseudo-static test which is quite similar. The result shows the Pushover analysis method has a guiding significance for engineering.(2) Using six sofeware including ETABS,ABAQUS, EPDA, PERFORM-3D, MIDAS,GSNAP study features of structure component and practical engineering. The plastic hinge model and fiber model have great differences through analyzing the frame structure model.With the bar area increases, the capacity difference between the two models decreases,it show that the difference between plastic hinge model with the fiber model is mainly in the material constitutive of concrete.Fiber bundles model, shell element model and elasto-plastic damage model have differences. Fiber shell element model is less than the ultimate capacity of elasto-plastic damage model and shear wall element model.(3) Finding different loading models has different result,which of the largest is to 32%.so that, more than two load pattern should be recommended and obtaining Unfavorable results to judge performance of building structures.(4) Studying element mesh, reinforcement ratio and displacement convergence condition. calculation found that when frame structure displacement convergence conditions take 0.01, shear wall structure when the displacement convergence condition of calculated results take 0.1 can meet the practical engineering accuracy needs. The sensitivity analysis and the reasonable value of element mesh is through setting different units, the result show that frame structure element mesh take 2 meters,and shear wall structure element mesh take 1 meter,which can guarantee results having enough accuracy.The increase of horizontal distribution of shear wall rebar are limited to the ultimate bearing capacity, the increase of vertical distribution of shear wall rebar and concealed column rebar can improve the ultimate bearing capacity obviously. Due to the reinforcement ratio of component is quite lartge to the result, so we should according to real reinforced,and ensure the results that is accurate.(5) Testing Pushover function of GSNAP being developed.The results of GSNAP and EPDA are close for the framework,but greatly different for shear wall,due to the difference between reinforcement ratio of concealed column and deformation coordination of wall element of software.