火灾下钢框架梁-柱子结构抗冲击性能有限元分析

Finite element analysis of impact resistance of steel frame beam-column structure under fire

为探究火灾高温下钢框架梁-柱子结构的抗冲击性能,利用ABAQUS有限元软件对钢框架火灾试验以及钢框架梁-柱子结构的冲击试验进行数值模拟.在验证数值模型有效性的基础上,对钢框架梁柱子结构有限元模型进行局部高温耦合,并通过改变落锤质量、冲击速度以及节点的连接方式,研究钢框架梁-柱子结构在局部高温下的动力响应.研究表明:对高温下的钢框架梁-柱子结构进行冲击时,采用焊接翼缘与螺栓腹板连接(WUF-B)的梁-柱子结构的抗火和抗冲击性能优于采用翼板(FP)连接;改变落锤质量对结构的竖向挠度影响较大,但对冲击力峰值无明显影响;冲击能量保持不变时,冲击动量越小,结构的竖向位移、轴力和冲击峰值越大.

In order to investigate the impact resistance of steel frame beam column structure under high temperature in fire,ABAQUS finite element software is used to simulate the fire test of steel frame and the impact test of steel frame beam column structure.On the basis of verifying the validity of the numerical model,the finite element model of the steel frame beam column structure is coupled at local high temperature,and the dynamic response of the steel frame beam column structure at local high temperature is studied by changing the mass of the falling hammer,the impact velocity and the connection mode of the joints.The results show that when the steel frame beam column structure is impacted at high temperature,the fire resistance and impact resistance of the beam column structure with welded flange and bolted web connection(WUF-B)are better than those with flange plate(FP)connection;the vertical deflection of the structure is greatly affected by changing the falling weight,but the peak impact force is not significantly affected;when the impact energy remains unchanged,the smaller the impact momentum,the greater the vertical displacement,axial force and impact peak value of the structure.