高温环境下超静定结构的受力分析

Load Analysis of the Statically Indeterminate Structure under High Temperature

文章根据弹性稳定理论研究了超静定结构构件在火灾情况下的静力特性问题,导出了高温下杆件的静力稳定临界力计算式,并讨论了温度、长细比、构件截面形式、材料特性等因素对杆件静力稳定临界力的影响,探讨了在实际工程中如何减小结构失稳的问题,可为超静定结构抗火设计提供参考。

Based on the theory of elastic stability, static load of the statically indeterminate struciure in fire is studied; formula of the ultimate static load in different members under high temperature is worked out; influence of the factors such as temperature, slenderness ratio, section forms of the members and the strength of materials on the uhimate static load is discussed; and how to diminish stability loss in practical engineering is approached, which can be referred by fire-resistance design of the statically indeterminate structure.