不同方向水平力下多腔钢管混凝土巨型柱抗震性能研究

提出了一种异形截面的多腔钢管混凝土巨型柱,研究了其在不同方向水平力作用下的抗震性能。进行了6个1/25缩尺的巨型柱模型在竖向荷载和不同方向水平反复荷载作用下的抗震性能试验研究,其中:2个试件的水平力沿截面长轴方向施加,2个试件的水平力沿截面短轴方向施加,2个试件的水平力沿与长轴及短轴呈45度方向施加,3种水平力加载方向的试件轴压比分别为0.5、0.25。基于试验结果,分析了各试件的承载力、刚度及其退化过程、延性、滞回特性、耗能和破坏特征。进行了数值模拟分析,计算结果与试验符合较好。研究表明,提出的异形截面多腔钢管混凝土巨型柱有良好的抗震性能,且其抗震性能与水平力作用方向相关。

Research on seismic behavior of multi-cell CFST mega-columns under horizontal forces in different directions

A multi-cell concrete-filled still tube(CFST) mega-column with special shaped section was proposed,and its seismic behavior under horizontal forces in different direction was researched.The experimental research on seismic behavior of six 1/25 scaled multi-cell CFST mega-column models was carried out under vertical loading,as well as the horizontal low cyclic loading in different direction.The axial force ratio was 0.5 and 0.25.The horizontal load was applied along the long axis,the short axis,and in the direction of 45° intersetion angle with long and short axes,respectively.The load-bearing capacity,stiffness and its degeneration,ductility,hysteretic properties,energy dissipation capacity,and failure characteristic of models were analyzed based on the experimental results.Numerical simulation analysis was also made,and the its results agree well with those from the test.The results show that the multi-cell CFST mega-column with special shaped section has good seismic behavior,and the behavior is relevant to the direction of horizontal forces action.