火灾下高强钢端板连接节点力学性能有限元分析

FEM analysis on behavior of high strength steel endplate connections in fire

摘要:

为研究高强钢端板连接节点在火灾作用下的力学性能,对7个梁柱端板连接节点在550℃的火灾高温下进行足尺试验研究。依据试验结果,采用通用有限元件ABAQUS建立高强钢端板连接节点有限元模型,从网格划分、单元种类选择、接触定义、分析步设置以及失效准则的确定等方面详细介绍建立模型过程,并得到高强钢端板连接节点在火灾下和常温下的弯矩-转角关系曲线、破坏模式以及端板的应力分布和屈服线模式。同时,将有限元分析结果同试验研究结果进行对比校验,结果显示,本文有限元模型具有足够精确性。

Abstract:

In order to obtain the behavior of high strength steel endplate connections in fire, full-scale tests on 7 joints were conducted at elevated temperature 550℃. Based on the test results, a FEM analysis on high strength steel endplate connections under fire conditions was carried out by ABAQUS. Details of the numerical modelling, such as mesh generation, element type, contact interaction, analysis process and failure criterion based on deformation, are presented. Herein the moment–rotation relationship, failure mode and stress state as well as yield line pattern of high strength endplate connections both at ambient temperature and in fire are revealed. Besides, the validations of the numerical modelling against all representative experimental results show that good agreements exist.