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为了研究高强度约束钢柱在火灾下的反应,根据高强度结构钢Q460在高温下的力学性能参数,建立了约束高强度钢柱受火分析模型,得到了高强度约束钢柱在火灾下的轴向位移、跨中挠度、最大应力以及临界温度。采用有限元分析对理论结果进行了验证,两者吻合很好。利用验证过的该文计算方法计算了2种荷栽比、长细比和约束刚度比条件下的高强钢柱的抗火性能;采用CECS200:2006的力学性能参数计算了约束普通钢柱的抗火性能。通过对高强钢和普通钢的抗火性能分析发现,轴向约束明显降低钢柱的临界温度,长细比、荷载比越大,临界温度越低;高强钢的抗火性能要优于普通钢。
In order to study the response of high-strength constrained steel columns under fire, according to the mechanical properties of high-strength structural steel Q460 at high temperature, a model of confined high-strength steel columns subjected to fire was established, and the high-strength confined steel columns were obtained under fire Axial displacement, mid-span deflection, maximum stress and critical temperature. The finite element analysis of the theoretical results have been validated, both agree well. The calculated fire resistance of two high-strength steel columns with different loading ratios, slenderness ratio and restrained stiffness ratio were calculated by the validated calculation method. The mechanical properties of the steel columns restrained by CECS200: 2006 were calculated. Fire performance. Through the analysis of the fire resistance of high strength steel and ordinary steel, it is found that the axial restraint significantly reduces the critical temperature and the slenderness ratio of the steel column. The larger the load ratio, the lower the critical temperature. The fire resistance of high strength steel is better than that of ordinary steel .