Experimental study on seismic performance of anchor joint with bolt yield-type liftable column
In order to ensure the safety of the structure in the epicenter of the earthquake and the rapid repair and use after the earthquake,a liftable column base node with yield-type anchor bolts was designed.This node was a semi-rigid node.A part of the column base anchor bolts were used as the damper of the node.The damper provided the bending resistance and uplift capacity for the column base.The plastic deformation of the column base node was mainly concentrated on the damper during the earthquake.After the earthquake,the column base node could be repaired by replacing the damper.To this end,a set of ordinary exposed column base nodes and liftable column base nodes with anchor bolt yield-type were designed for comparative tests,and their seismic performance under low cycle repeated loads,such as hysteresis characteristics,bending bearing capacity,stiffness degradation,energy dissipation capacity,were studied through quasi-static tests.At the same time,the seismic performance of column base nodes before and after replacing dampers were also studied.The research results indicated that compared to ordinary exposed column base nodes,the yield-type anchor bolts could lift the column base node with better energy dissipation and deformation capacity.The damage of the specimens was mainly concentrated on replaceable dampers,and the energy dissipation mode and damage mechanism were more reasonable.After the repair,except for the initial rotational stiffness slightly lower than the pre repair specimen,the overall seismic performance could basically recover to the pre earthquake level.In addition,the damper of the new column base was easy to disassemble and replace.
NETL
NSTL
万方数据
维普
