多腔钢管混凝土柱巨型框架抗震性能试验研究

结合某超高层巨型框架结构工程实际,进行了一榀巨型框架结构底部三个巨型层1/25缩尺模型抗震性能试验研究.该巨型框架的巨型柱为多腔钢管混凝土异形截面柱,巨型梁为钢桁架梁,底部巨型层加设人字形箱形截面钢支撑,二、三巨型层加设X形箱形截面钢支撑.通过试验,分析了该巨型框架的滞回特性、承载力、刚度及退化过程、延性和屈服机制.试验表明,该巨型框架的支撑作为第一道防线首先屈服,之后巨型桁架梁上下弦杆进入屈服,最后巨型柱柱底出现塑性铰,实现了多腔钢管混凝土柱巨型框架结构延性屈服机制,抗震性能良好.

Experimental Research on Seismic Behavior of Mega-Frame with Multi-Cell CFST Columns

The experimental research on seismic behavior of a 1/25 scaled mega-frame model with 3 megastorey from the bottom has been carried out according to a supper high-rise mega-frame structure building.The multi-cell special-shaped CFST columns are used for mega-columns.The steel truss beams are used for megabeams. The K-shaped steel brace with box section is set at the bottom mega-storey.The X-shaped steel braces with box section are set at the second and the third mega-storey.The hysteretic properties,load-bearing capacity, stiffness and its degeneration,ductility and yielding mechanism of the mega-frame have been analyzed based on the experiment.The results show that the brace in the mega-frame yields as the first line of defense. Then the upper and the lower chord members of mega truss beam yield.At last,the plastic hinges appear at the bottom of mega-column.The ductile yielding mechanism has been achieved for the multi-frame structure with multi-cell CFST columns with good seismic behavior.