Seismic Performance Analysis And Evaluation Of High-Rise Steel-Concrete Mixed Structure

Along with the economic development of our country and urbanization,steel-concrete mixed structures in high-rise buildings are widely used.However,research achievements of high-rise steel-concrete mixed structure can't completely meet the large-scale construction and development requirement.In order to ensure the high-rise steel-concrete mixed structure seismic safety,taking a SRC frame-tube tall hybrid structure as a cardinal object of study,the typical components of tall hybrid structures,structure modeling,nonlinear seismic response analysis,seismic vulnerability analysis and some other related concerns are researched in this paper.The nonlinear seismic response and seismic performance analysis and evaluation of high-rise steel-concrete mixed structure are key areas in this paper.This paper mainly focuses on the following aspects:1.In OpenSEES,a structural analysis software,using different constitutive model of steel and concrete,a numerical simulation method based on the fiber model is proposed to ansys SRC beams and columns.The numerical simulation method is used to simulated pseudo-static test of SRC columns,meeting with good results.The influence of andaxial pressure ratio,steel embedded ratio,and strength of concrete and steel on the bearing capacity and ductility of SRC columns are analyzed.The numerical simulation method proposed in OpenSEES is simplified and applied to another structural analysis software named PERFORM-3D,thus PERFORM-3D prepares the ground for the nonlinear seismic response analysis of steel-concrete mixed structures in high-rise buildings with SRC beams and columns.2.Using fiber coupling beam model and fiber wall model based on MVLEM principle,a pseudo-static test of core-tube with steel frame inside is simulation in PERFORM-3D.Comparing with the test,the simulation method is reliable and effective,thus PERFORM-3D prepares the ground for the nonlinear seismic response analysis of steel-concrete mixed structures in high-rise buildings with core-tube.The damage development process of a model test is simulated.Meanwhile,the influence of axial compression ratio,height-width ratio,coupling beam span-depth ratio on the seismic performance of core-tube are analyzed.3.Based on the content of performance-based design in " JGJ3-2010 Technical Specification for Concrete Structures of Tall Building",some performance indicators are quantfied to ansys and evaluate the seismic performance of high-rise steel-concrete mixed structure.PERFORM-3D,with the effective finite element model of beams,cloums and core-tube,is used to analyze a 1:10 shake table test of SRC frame-tube tall hybrid structure.The prototype structure of shake table test is built in PERFORM-3D to carry out the nonlinear earthquake response analysis,simulating the damage development process of the test.The performance indicators are used to analyze and evaluate the seismic performance of the prototype structure.4.Based on IDA,a seismic vulnerability analysis method of high-rise steel-concrete mixed structure is proposed.Taking a 50-storey high-rise steel-concrete mixed structure as an example,the probabilities of seismic vulnerability analysis for given ground motion intensity level are estimated,respectively.The vulnerability analysis results provide basis and reference for the prediction of major engineering structure seismic damage and loss.