Investigation on behavior of a replaceable energy-dissipative rocking column-base joint
Li Guoqiang1,2 Sun Zhe1 Zhang Guipeng1 Li Yanwen1
1. College of Civil Engineering, Tongji University, Shanghai 200092, China；
2. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
Abstract：In this work, a kind of replaceable hinged joint of column base was introduced and investigated in the static test. The double-leg energy-dissipative rocking column is composed of two steel column legs and the soft steel tie rod connecting the two column legs. Hence, it can effectively control the lateral deformation mode of the structure under strong earthquakes, and thus preventing the occurrence of “weak storey” damage and use the yielding of soft steel tie rod for energy dissipation, resulting in the improvement on the overall seismic capacity of the structure. The developed column base joint has the ability of rotation and the uplift resistance, which may prevent the column base from yielding under the bending moment produced by the lateral action and resist the tensile force caused by the overturning of the two column legs under the lateral force. Based on the yield line theory, the calculation formula for the uplift bearing capacity of the column base joint was derived, and the specimens of the column base joint were designed for parallel tests. The actual mechanical behavior and failure mode of the specimens were studied by monotonically static loading test, and the accuracy of the calculation formula was verified by finite element analysis. The test results indicate that the developed column base joint has good uplift bearing capacity and ductility, and it can meet the requirement of replacement as a hinged column base with good uplift capacity.
