摘要
以某体育馆的钢屋盖结构为研究对象,利用ANSYS有限元软件对其进行模态分析,分别将拱桁架与立体桁架之间的连接耦合成铰接和刚接,分析比较了结构的自振频率及振型.借助ANSYS,采用振型分解反应谱法研究其抗震性能.结果表明,该屋盖结构的频率分布较为密集,其动力特性复杂,且高阶振型的影响较大,在进行抗震性能研究时需考虑高阶振型;而拱桁架与立体桁架之间的连接形式对结构动力特性的影响不大,可以忽略.屋盖整体结构在水平地震作用下的反应也不明显.
The steel roof structure of a gymnasium is taken as the research object, and a modal analysis is carried out by ANSYS finite element software. The connections between arch-truss and spatial truss are set to hinged support and fixed support separately; thus the natural vibration frequency and vibration modes are compared and analyzed. And the seismic performance of the roof structure is investigated by applying the principles of superposition and ANSYS software. The results indicate that the natural vibration frequency is dense; the dynamic characteristics are complex; and thus the participation of the higher-order vibration modes should be considered in earthquake-resistance design course. The influence made by different connection forms on the dynamic characteristics may be ignored and the effect exerted by a horizontal earthquake on the overall roof structure is little.
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2008年第3期123-126,共4页
Journal of Central South University of Forestry & Technology
关键词
建筑工程
钢管桁架
动力特性
自振频率
振型
抗震性能
constructure engineering
steel tubular truss
dynamic characteristic
natural vibration frequency
vibration mode
seismic performance
