钢结构外露式刚接柱脚耗能特性的实验研究

Energy-Dissipation Experiment Research of Open Rigid Column Base Connection in Steel Structure

通过H型钢柱脚与混凝土外露锚栓连接基础足尺寸实验,研究2组不同锚栓布置的柱脚连接节点在循环往复荷载作用下的全局响应和各组成单元的局部响应情况,分析刚接柱脚在地震作用下的耗能特性和屈服机制.结果表明,外露式刚接柱脚节点在弹性层间位移转角限值内处于弹性工作状态;在塑性层间位移转角内,柱翼缘和锚栓刚屈服就开始强化,节点承载力进一步提升,并可以较好的满足正常使用状态的需要.在往复荷载作用下,试件的荷载-位移滞回特性曲线呈梭形,具有一定的耗能特性,且外露式刚性连接的柱脚具有一定的半刚性特性.

A full scale model of a steel ＂H＂ column base rigidly connected to a concrete foundation was studied to learn the global and local response of the base connections under two conditions. Energy dissipation by the structure, and the yield mechanism of the rigid base connection, were studied under seismic loading. The results show the open rigid column-base connection responds elastically within the elastic limit of the inter-story displacement angle. In the plastic inter-story displacement regime the column flange and anchor bolt show stiffening and the bearing capacity of the connection increases. During cyclic loading stress-strain hysteresis is present and the curve shows a shuttle shape. This indicates the base connection is semi-rigid and capable of dissipating energy.