Frictional Rotation Performance Study Based on Non-Standard Bolt Hole Nodes

In order to study the frictional energy dissipation of steel structure nodes under the condition of small rotation, a frictionally rotatable node is proposed based on non-standard bolt holes, which can effectively increase the energy dissipation capacity of the node and reduce the damage of the node, so that the node can better meet the current requirements. The seismic performance of the node is studied by means of quasi-static test and finite element analysis. The displacement-load hysteresis curves and skeleton curves of the node were obtained by varying the size of the bar holes, the number of bolts and the position of the curved holes under different parameters, and the hysteretic performance, failure mode and energy dissipation mechanism of the joint are analyzed, which provides a basis for further research on non-standard hole joints. The results show that the length of the energy dissipating slip section of the node depends on the size of the flange bar bolt hole, the magnitude of the slip load is directly influenced by the friction between the plates, and the node can effectively achieve energy dissipation during frictional rotation, which can effectively prevent the premature failure of the connecting welds of the joint plate.