型钢十字柱火灾后抗震性能模拟分析

Simulation analysis of seismic performance of cross steel columns after fire

对火灾后型钢十字柱的抗震性能进行有限元模拟分析。以试件截面形状、是否受火以及防火涂料厚度作为影响因素,运用ABAQUS有限元软件对8根型钢十字柱构件进行低周反复荷载试验,得出构件的滞回曲线、骨架曲线以及耗能能力。结果表明:常温下,内凹构件的耗能能力是无内凹构件的1.2倍,而高温下,无内凹构件的抗震性能均优于内凹试件;增加防火涂料厚度,提高了构件的极限承载能力与耗能能力,其中内凹试件提升较明显,5mm相比4mm提升了14.5%,6mm相比5mm提升了2.5%,无内凹试件提升相对较弱,5mm相比4mm提升了1.7%,6mm相比5mm提升了0.7%。

A finite element simulation analysis was carried out on the seismic performance of the steel cross column after the fire. Taking the section shape of the test piece, whether it is exposed to fire and the thickness of the fireproof coating as the influencing factors, the ABAQUS finite element software is used to perform low-cycle repeated load tests on 8 section steel cross column members, and the hysteresis curve, skeleton curve and energy dissipation capacity of the member are obtained. The results show that at room temperature, the energy dissipation capacity of the concave component is 1.2 times that of the non-concave component, while at high temperature, the seismic performance of the non-concave component is better than that of the concave specimen;the thickness of the fireproof coating is increased,and the component’s performance is improved. The ultimate load-carrying capacity and energy consumption capacity, in which the concave specimens have increased significantly, 5 mm compared with 4 mm increased by 14.5%, 6 mm compared with 5 mm increased by 2.5%, and no concave specimens increased relatively weakly, 5 mm compared with 4 mm increased It’s 1.7%, 6 mm is 0.7% higher than 5 mm.