摘要
本文采用SAP2000程序建立了半刚性连接组合框架的有限元模型,基于半刚性组合节点试验所得到的滞回模型,研究了半刚性连接组合框架的地震反应特征,并分析了连接刚度变化对多层组合钢框架动力特性的影响,比较了框架中不同位置连接的耗能能力。分析结果表明,连接柔度会降低结构的低阶自振周期,但是对高阶模态影响则很小。地震作用下半刚性连接组合框架的位移反应不一定大于对应的刚接组合框架,而地震剪力则减小。框架中的边节点耗散的地震能量多于中间节点,而底层节点耗散的能量又多于中间层和顶层节点。
A FE model of semi-rigid connected composite frame is established in this paper. Based on the test hysteretie loops of the semi-rigid composite connection, the seismic response of the frames is analyzed. The effect of connections flexibility on the structural frequencies is presented. Flexibility of the connections has a relatively more pronounced effect on the lower frequencies. The seismic displacement response of the semi-rigidly connected composite frames is not always greater than that of the corresponding rigidly connected composite frames,while the seismic forces of the semi-rigidly connected composite flames induced by the seismic actions are decreased with the decreases of the stiffness of the connections. The energy dissipations of the semi-rigid composite connections in semi-rigid composite frames are different depend on their positions. The external joints dissipate more energy than the internal joints, and energy dissipated by the first-floor joints are more than that the joints located in other floors.
出处
《工程抗震与加固改造》
2007年第1期19-25,共7页
Earthquake Resistant Engineering and Retrofitting
基金
国家杰出青年科学基金项目资助(50225825)
关键词
半刚性连接
组合框架
自振特性
地震反应
耗能能力
semi-rigid connection
composite frame
dynamic characteristic
seismic response
energy dissipation
