钢结构整体抗火模型的建立与有限元分析

Establishment of the fire-resistance model of the whole steel structure and the finite element analysis

考虑火灾下工字型钢梁温度沿截面高度呈非线性分布,以某角楼实际三维框架为研究对象,利用ABAQUS对在静力载荷和温度载荷共同作用下的钢框架整体结构进行数值模拟与有限元分析.通过编写输入文件对工字型钢梁截面施加非线性温度载荷,探索了火灾下整体结构的力学特性和薄弱环节,分析了受火区域不同时整体结构在局部火灾作用下的应力分布规律及变形特点,更加真实地模拟出了钢结构整体的抗火性能,为更加合理的进行整体结构的抗火提供参考.

Considering that the temperature distributes along the cross section of the I-shape steel beam in local fire is nonlinear, the model of the three-dimension steel frame of the turret is built using ABAQUS to simulate the whole steel structure numerically and do some finite element analysis of the steel frame structure under fire in the static load and temperature load ~ An input file is written to apply nonlinear temperature load in the steel beam cross section, mechanical properties and the weak links of the whole structure and the rules of the stresses and the deflections under different fire zone are obtained. The analysis simulates fire resistance the whole steel structure more realistically and conclusions provide some references for the fire-resistant of the whole steel structure more reasonably.