多腔钢管混凝土柱巨型框架抗震性能试验研究
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摘要
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。
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.
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.
引文
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[6]刘大鹏,吴晓涵.某框架结构的弹塑性时程分析[J].结构工程师,2011,27(增刊):276-279. Liu Dapeng,Wu Xiaohan.Elasto-plastic time history analysis of a frame structure[J].Structural Engineers, 2011,27(S):276-279.(in Chinese)
[7]沈霄鹤,欧进萍.超高层巨型钢框架结构失效模式分析[J].东南大学学报,2009,39(增刊Ⅱ):144- 150. Shen Xiaohe,Ou Jinping.Failure mode analysis of super-tall huge steel frame structure[J].Journal of Southeast University(Natural Science Edition ), 2009,39(SII):144-150.(in Chinese)
[8]江见鲸,陆新征,叶列平.混凝土结构有限元分析[M].北京:清华大学出版社,2005. Jiang Jianjing,Lu Xinzheng,Ye Lieping.Finite element analysis of concrete structures[M].Beijing: Tsinghua University Press,2005.(in Chinese)
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