竖向恒载对框架结构动力稳定性影响研究

Study on dynamic stability of frame structure under vertical dead loads

以框架结构为例,建立了结构动力稳定性分析的基本模型,提出了利用动力响应的敛散性来判断结构动力稳定性的具体方法.通过算例分析,给定不同的竖向恒载值,得到框架结构在水平动力荷载作用下的临界荷载值,结果表明,竖向恒载对动力稳定性有明显影响,但动力临界荷载与相应静力临界荷载的比值变化不大.

The model to study the dynamic stability of frame structure by time-history analysis is discussed in this paper,and the convergence of displacement response is used for determining dynamic stability of frame structure.An example is given for a frame under horizontal dynamic loading at different vertical dead loadings,and the re-sult shows that vertical dead loads have great influence to dynamic critical load for frame structure,but the ratio of dynamic critical load to static critical load does not varied so obvious which is between 0.55 and 0.7.