摘要
为了研究结构参数对复杂大跨空间结构风致振动的影响,以上海南站工程屋盖结构为例,利用基于非定常风荷载的风致动力响应频域分析方法,对结构的抖振响应进行参数分析.参数分析的内容包括参振模态的数目、力谱交叉项、模态交叉项、结构阻尼比,并得到了一些有价值的结论.研究表明,选择足够数量的参振模态对保证计算精度非常重要,力谱交叉项、模态交叉项的不同处理方法对计算结果有较大影响,并且结构共振响应对结构阻尼很敏感.
In the paper, the computing method based on the non-steady wind pressure in frequency domain is applied to the calculation of roof structure of Shanghai South Railway Station. The main frequency-domain parameters, which are discussed here, include modal numbers, cross terms of force spectra, and cross terms of modals as well as damping ratio. The study shows that adequate modes are important to ensure the precision of computation, and different ways to deal with cross terms of force spectra and modals have a great effect on results, and the resonant responses are sensitive to the structural damping ratio.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第5期574-579,共6页
Journal of Tongji University:Natural Science
基金
国家创新研究群体科学基金和教育部高等学校骨干教师计划资助项目(50321003)
关键词
大跨空间结构
抖振响应
非定常计算方法
参数分析
long-span roof structure
buffeting responses
non-steady method
parametric analysis
