扩孔型端板连接新型钢结构节点恢复力模型

摘要

Aiming at a new type of end-plate connections with slotted holes,restoring force model of this connection type was developed in this paper.Based on analysis of the tested hysteretic curves of connection specimens,the overall hysteretic curves of connections under cyclic load were decomposed into three simplified hysteretic models respectively corresponding to the three different behavioral phases:elasticity,slippage,and slippage combined with compression.Then,the hysteresis rules of such connections were proposed.By means of numerical analysis and fitting method,key characteristic parameters of the simplified hysteretic models were determined.Subsequently,restoring force model for this type of connections was developed in combination with the known skeleton curve model.The comparison results showed that the restoring force model for the new type of end-plate connections is in good agreement with the experimental results,which could provide theoretical support for the application of steel frames with this new-type connection in seismic areas.%建立了一种采用扩孔连接的新型钢结构端板节点恢复力模型.首先在分析节点试验滞回曲线规律的前提下,将节点滞回曲线分解为弹性段、滑移段和滑移承压段三个不同的简化模型,并提出相应的滞回规则;然后应用数值分析与拟合等方法确定了简化滞回模型中的各关键特征参数,并结合已有的骨架曲线模型建立了该新型节点的恢复力模型.通过与试验滞回曲线的对比,验证了新型节点恢复力模型的准确性.该恢复力模型计算简单、滞回规则清晰,可为扩孔型端板连接新型钢结构节点在地震区的应用提供理论依据.