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为研究异型截面多腔钢管混凝土分叉柱不同加载方向下的抗震性能,结合某超高层建筑多腔钢管混凝土巨型框架结构,设计了4个1/30缩尺的分叉柱模型试件,进行了2种不同加载方向的低周反复荷载试验研究,一种沿截面长轴方向加载,另一种沿截面短轴方向加载。试件截面腔体钢板厚度包括2mm和3mm两种。分析了各试件的破坏特征、滞回特性、承载力、延性、刚度退化和耗能性能。研究表明,不同加载方向异型截面多腔钢管混凝土分叉柱受力性能有明显差异,沿截面长轴加载方向试件的承载力高、刚度大、延性好、耗能能力强;合理增加分腔钢板厚度能使分叉柱抗震性能加强。
In order to study the anti-seismic performance of multi-cavity CFST bifurcated columns with different loading directions, four 1/30-foot split-bored column model specimens were designed in combination with the mega-frame structure of a multi- Two kinds of low-cycle cyclic loading tests with different loading directions were carried out. One was loaded along the long axis of the section and the other was loaded along the short axis of the section. Specimen section cavity plate thickness includes 2mm and 3mm two. The failure characteristics, hysteretic characteristics, bearing capacity, ductility, stiffness degradation and energy dissipation performance of each specimen were analyzed. The results show that there are significant differences in the mechanical properties of multi-hollow-section CFST bifurcation columns with different loading directions. The loading direction along the long axis of the section has high bearing capacity, high stiffness, good ductility and energy dissipation capability. The thickness of the steel plate can enhance the seismic performance of bifurcated columns.