空间斜拉式预应力索拱结构的模态分析

以某会展中心钢屋盖工程为例,采用子空间迭代法计算其前20阶自振周期和振型,同时描述了其振型特点。结果显示,这种空间斜拉式预应力索拱结构的自振频率较为密集,表明这类结构的动力特性复杂,且高阶振型影响大,应尽可能的考虑高阶振型效应。本文的工作为更好的进一步研究此类新型结构形式的受力体系特征奠定了基础。

Modal Analysis on Stayed Pre-stressed Cable-truss Hybrid Structure

In this paper,based on the study of steel roof in some conference exhibition center,the subspace iteration is introduced to calculate self-vibration period and mode.At the same time,the characteristics of mode are summed up.The results indicate that the natural frequencies of the structure concentrate in a small range,which presents those dynamic characteristics are complex.Besides,the participating for some higher mode is also predominant.Thereby,the effects of higher mode should be considered to dynamic study.The conclusions from the paper play a foundation for the further study of the stressed properties of this new-style structure.