高温(火灾)环境下钢构件的动力稳定临界长度

Critical length of dynamic stability of steel structure members in high temperature condition

根据弹性稳定理论及Galerk in原理研究了钢构件在热状态下的动力特性问题,导出了高温下杆件的动力稳定临界长度计算式,并讨论分析了温度、长细比、构件截面形式、材料特性等因素对杆件动力稳定临界长度的影响,并给出了不同约束条件下构件的计算参数,探讨了在实际工程中如何减小结构振动的问题,可为钢结构抗火设计提供参考。

The problems of dynamic character of steel structure members under thermal state were studied by elasticity stability theory and Galerkin principle in this article. The calculating formulas for critical length of dynamic stability of steel structure members on high temperature condition under axial dynamic load were conducted and the effects of temperature, ratio of length and thin, section forms of members, material character etc equation were studied. The calculate parameter of members on difference restrict of rods were presented, how reduce vibration respect steps of members in practical engineering were put forwarded. It is hoped that these may prove to be some value on high temperature condition in steel structure resist fire design.