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基于塑性极限分析理论,采用最小势能原理,提出了火灾下高温钢板剪力墙屈曲后的拉力带模型TSM(Temperature String Modal),依据此假定推导了考虑变温场极限状态下钢板剪力墙屈曲后的水平承载力计算完全解,对火灾温度场下钢板剪力墙屈曲后强度进行了研究。利用上述方法对石化炉体装备的钢箱体结构进行了抗火极限分析和结构防火保护的优化设计。实例与数值模拟结果的对比表明该方法简单有效,可以为钢箱体结构抗火设计提供理论依据和实用的计算方法。
Based on the plastic limit analysis theory and using the principle of minimum potential energy, TSM (Temperature String Modal) model is proposed after buckling of high temperature steel plate shear wall under fire. Based on this assumption, The full solution of horizontal bearing capacity was calculated and the post-buckling strength of steel plate shear wall under fire temperature field was studied. Using the above method, the steel box structure of petrochemical furnace equipment was optimized for fire resistance analysis and structural fire protection. The comparison between the numerical results and the numerical examples shows that the method is simple and effective and can provide theoretical basis and practical calculation method for the fire resistance design of steel box structure.