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竖向组合构件抗震性能研究
Studies on Seismic Behavior of Vertical Composite Members
【作者】 江枣；
【导师】 钱稼茹；
【作者基本信息】 清华大学 ， 土木工程， 2010， 博士
【摘要】 由于高层和超高层建筑的不断发展,传统钢筋混凝土柱和剪力墙已不能满足工程要求,在此背景下,具有显著优点的钢-混凝土竖向组合构件越来越受到关注,工程应用也越来越多。钢管混凝土组合柱和钢管混凝土组合剪力墙是两种新型的竖向组合构件,对其抗震性能等的研究尚不充分。本文通过理论分析、试验研究和数值计算,研究钢管混凝土组合柱和钢管混凝土组合剪力墙的变形能力、承载能力和损伤性能等,为钢管混凝土组合柱和组合剪力墙的工程应用提供理论依据。本文的主要工作和成果包括:1)分析了作为钢管混凝土竖向组合构件关键组成部分的钢管混凝土柱的轴心受压受力机理,并据此提出钢管混凝土短柱轴心受压承载力计算公式,其中引入反映钢管轴压承载作用和对混凝土约束作用的钢管约束承载力提高系数。2)分析了钢管混凝土组合柱的箍筋对钢管内外混凝土的约束作用和钢管对管内混凝土的约束作用,提出了轴心受压组合柱轴压力与应变的关系式,通过极限分析确定了轴心受压组合柱的承载力极限状态和组合柱峰值应变,提出了组合柱轴压承载力计算方法,并用试验数据进行了验证;建立了轴心受压组合柱极限压应变的计算公式,通过算例比较了钢筋混凝土柱与组合柱的极限压应变;为使组合柱的轴心受压破坏形态较为合理,提出了钢管混凝土截面积占组合柱总截面比例应有上限,并给出了组合柱不同设计参数条件下钢管混凝土截面积比例的上限值。3)进行了钢管混凝土组合剪力墙在高轴压力和往复水平力作用下的拟静力试验,研究了组合剪力墙的抗震性能,分析了各设计参数对组合剪力墙承载力、变形能力、耗能能力等抗震性能的影响,探讨了轴压比限值及约束边缘构件的箍筋配置。4)在已有钢筋混凝土构件变形能力计算方法的基础上,提出了钢管混凝土组合柱和组合剪力墙变形能力计算方法,采用数值计算研究了钢骨/钢管混凝土组合剪力墙的弯矩-曲率关系。5)建立了钢管混凝土组合柱和组合剪力墙基于低周累积损伤的耗能计算方法和损伤模型,并对耗能和损伤计算方法进行了试验数据验证,在此基础上提出了钢管混凝土组合柱和组合剪力墙的损伤指标。
【Abstract】 As the development of the high-rise and ultra-high-rise buildings, the conventional reinforced concrete (RC) vertical member tends to be difficult in satisfying the structural requirement, and the steel-RC composite member obtains more and more attention and has been widely used for its remarkable excellences. The steel-RC composite column and steel-RC composite wall are two examples among kinds of the new vertical composite members. Research on seismic behavior of the steel-RC composite column and the composite wall remains rather limited. In this dissertation, the deformation capacity, load-carrying capacity, and damage performance of the two forms of the vertical composite members is studied through the method of theoretical analysis, experimental research, and numerical calculation, which would provide a theory basis for the engineering application of the steel-RC composite column and the composite wall.The main work product of the dissertation is described as followings: 1) As the key component of the vertical composite member, the axial compressive mechanism of the concrete filled-steel tube column is studied, on the basis of which, the formula for calculating the centric axial compressive strength of the short concrete filled-steel tube column is proposed, and the strength enhancement factor due to steel tube confinement is introduced into the formula. 2) The confinement on the different parts of concrete caused by the steel tube and hoops is analysed, and the relationship between the axial compressive force and strain of the steel tube-RC composite column is presented. The ultimate strength state of the steel tube-RC composite column is determined through the limit analysis method, and the formula for calculating the compressive strength of the composite column is established and verified by experiment results. The ultimate compressive strain of the composite column is calculated by the method presented in this dissertation, and the deformation capacity of the composite column is compared with the RC column through an example. Based on the strength research, the upper limit value of the proportion of the steel tube confined concrete area over the overall sectional area of the composite column is suggested, meeting the requirement of which leads to the favorable compressive behavior. 3) Quasi-static tests on the steel tube-RC composite shear wall specimens subjected to high axial compressive load are conducted. The important properties of the walls are studied, i.e., the load-carrying capacity, deformation capacity, and energy dissipation. The effects of the design parameters are investigated, and the possibility of easing the requirement for axial force ratio and transverse boundary reinforcement is also explored. 4) According to the previous research about the deformation capacity of the RC members, the method for calculating the deformation capacity of the steel-RC composite column and the composite wall is developed, and numerical analysis on the sectional moment-curvature relationship of the steel/steel tube RC composite wall is conducted. 5) The energy dissipation and damage modal of the steel-RC composite column and composite wall is established based on the low-cycle cumulative damage and deterioration theory, and verified by experimental results. The damage index of the steel-RC composite column and composite wall is proposed.