火灾下高强钢栓焊连接节点力学性能数值研究

Numerical Study of Mechanical Behavior of High Strength Steel Flange-Welded Web-Bolted Connections in Fire

摘要:

采用ABAQUS对高强钢栓焊连接节点火灾下的力学性能进行模拟，通过经验证的模型对高强钢栓焊连接节点进行参数分析。结果表明：温度升高，节点的极限抗弯承载力M_max、节点塑性抗弯承载力M_y和节点的初始刚度K_ini均降低；强度较低钢材的节点匹配较厚的梁柱翼缘和腹板比强度较高钢材的节点匹配较薄的梁柱翼缘和腹板，可获得相近的节点塑性抗弯承载力以及相近或更高的节点转动能力，从而实现节点优化设计。

Abstract:

In this paper， ABAQUS was adopted to simulate the mechanical properties of high strength steel （HSS） flange-welded web-bolted connections in fire. Based on the validated numerical model， parametric analysis of HSS flange-welded web-bolted connections was conducted. It is shown that： as the temperature increases， M_max， M_y and K_ini of the connections decrease correspondingly. Compared with the connections made of higher strength steel matched with thin beam-column flange and web， the connections made of lower strength steel matched with thick beam-column flange and web can obtain a similar plastic bending bearing capacity and rotational capacity， thus realizing the optimal design of connections.