变轴力钢管混凝土柱抗震性能试验研究

发布时间：2018-05-10 09:12

本文选题：变轴力 + 钢管混凝土柱　；参考：《工程抗震与加固改造》2016年06期

【摘要】：为了研究地震作用下轴力变化对圆截面钢管混凝土框架柱抗震性能的影响,采用子结构拟动力试验方法进行了4个水准地震作用下的框架结构拟动力试验。试验程序利用有限元程序OpenSees进行数值计算,并与拟动力试验控制系统实现数据实时交互传递。建立了一个4层钢管混凝土框架模型,将首层钢管混凝土柱作为试验子结构进行变轴力作用下钢管混凝土柱抗震性能试验。分析轴力变化对钢管混凝土柱滞回特性、耗能能力、塑性变形等性能的影响,并对比研究地震作用对边柱与角柱的影响。试验结果表明:地震作用下框架柱的轴力会发生较大变化;轴力变化导致钢管混凝土框架柱滞回曲线"捏缩效应"更加明显,塑性铰区域塑性变形累积增长较快、局部屈曲提前出现;与定轴力作用相比,变轴力下框架柱耗能能力受到削弱,抗震性能降低。
[Abstract]:In order to study the effect of axial force variation on seismic behavior of circular section concrete-filled steel tubular frame columns, quasi dynamic tests of frame structures under four horizontal earthquakes were carried out by using substructure pseudo-dynamic test method. The test program uses finite element program OpenSees to carry out the numerical calculation, and realizes the real time interactive data transfer with the pseudo-dynamic test control system. A four-story concrete filled steel tube frame model was established. The concrete filled steel tubular columns were used as experimental substructures to test the seismic behavior of concrete filled steel tubular columns under variable axial forces. The effects of axial force on hysteretic characteristics, energy dissipation capacity and plastic deformation of concrete-filled steel tubular columns are analyzed, and the effects of seismic action on edge columns and corner columns are compared. The experimental results show that the axial force of frame column will change greatly under earthquake, and the "pinch effect" of hysteresis curve of CFST frame column will be more obvious, and the accumulation of plastic deformation in plastic hinge region will increase rapidly. Compared with the fixed axial force, the energy dissipation capacity of the frame column under variable axial force is weakened and the seismic performance is reduced.
【作者单位】：北京建筑大学工程结构与新材料北京高等学校工程研究中心;湖南大学土木工程学院;
【基金】：教师队伍建设—青年英才计划入选人员(2015年)—张国伟(21147514036) 国家自然科学基金重大国际合作项目(51161120360);国家自然科学基金重大研究计划集成项目(91315301-09)
【分类号】：TU398.9;TU352.11

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