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异形截面多腔钢管混凝土柱的腔体构造对其抗震性能影响很大,结合大连国贸中心大厦结构五边形多腔钢管混凝土巨型柱设计,提出了分腔竖向钢板在基础顶面部位连续和断开两种构造方式。为研究这两种不同构造的五边多腔钢管混凝土巨型柱抗震性能,进行了2组共4个1/7.5缩尺模型试件的低周反复荷载试验。第一组试件为分腔竖向钢板在基础顶面部位连续的截面构造,第二组试件为分腔竖向钢板在基础顶面部位断开的截面构造。每组试件分沿截面对称轴方向、沿垂直截面对称轴方向施加水平荷载两种加载方向。分析了各试件的破坏特征、承载力、耗能、刚度退化、滞回特性和延性。研究表明:分腔竖向钢板在基础顶面部位连续的试件,承载力较高、延性较好、抗震耗能能力较强,但两种加载方向下抗震性能有明显差异;分腔竖向钢板在基础顶面部位断开的试件,承载力略低,但两种加载方向下抗震性能接近。
The cavity structure of multi-cavity CFST column with special-shaped cross-section has a great influence on its seismic performance. Combined with the design of pentagonal multi-cavity tubular CFST column in Dalian International Trade Center Building, Disconnect two ways of construction. In order to study the seismic behavior of the two kinds of five-sided multi-cavity CFST giant columns with different configurations, two low-cycle cyclic loading tests of four 1 / 7.5 scale model specimens were carried out. The first group of specimens is a continuous section structure of the sub-cavity vertical steel plate on the top surface of the foundation and the second group of specimens is the cross-section structure of the sub-cavity vertical steel plate which is disconnected at the top surface of the foundation. Each group of specimen points along the direction of the symmetry axis of the cross section, and two horizontal load loading directions are applied along the symmetry axis of the vertical cross section. The failure characteristics, bearing capacity, energy consumption, stiffness degradation, hysteresis and ductility of each specimen were analyzed. The results show that the specimens with continuous cavity on the top surface of the basement have higher bearing capacity, better ductility and better seismic energy dissipation capability, but the seismic behavior of the vertical steel plate in the two loading directions is obviously different. The specimens with the steel plate broken at the top of the foundation have slightly lower bearing capacity, but the seismic performance of the two loading directions is similar.