单层鞍形网壳结构地震激励频域响应特性分析

发布时间：2018-07-05 02:16

本文选题：鞍形网壳 + 地震激励　；参考：《钢结构》2016年12期

【摘要】：为研究鞍形网壳在地震动激励下的振型反应规律,将结构地震作用表达为仅与时间变量有关的随机过程,给出频域内结构准静力响应、共振响应和耦合响应的定义及计算式;计算两组地震动功率谱作用下,鞍形网壳结构的位移响应谱,包括准静力响应谱、共振响应谱和耦合响应谱,总结结构位移响应的频域分布特性,分析准静力响应及共振响应之间的相关性;提出改进的振型叠加法,并给出数值算例。研究结果表明,对应一定的地震动输入功率谱,鞍形网壳结构的响应主要是特定频率区段的振型响应。在z向地震作用下,准静力响应和共振响应的耦合效应对总响应的影响不可忽略,而在x、y向地震作用下,这一效应可忽略。计算结果表明,所提出的改进振型叠加法计算效率和求解精度优于传统振型叠加法。
[Abstract]:In order to study the vibration response law of saddle reticulated shell under ground motion excitation, the seismic action of the structure is expressed as a stochastic process related only to time variables, and the definition and calculation formula of quasi static response, resonance response and coupling response of the structure in frequency domain are given. The displacement response spectrum, including quasi-static response spectrum, resonance response spectrum and coupling response spectrum, are calculated for saddle reticulated shell under the action of two sets of ground motion power spectra, and the frequency domain distribution characteristics of displacement response of the structure are summarized. The correlation between quasi-static response and resonance response is analyzed, and an improved mode superposition method is proposed, and a numerical example is given. The results show that the response of saddle reticulated shell is mainly the mode response of certain frequency range corresponding to a certain input power spectrum of ground motion. The coupling effect of quasi-static response and resonance response on the total response can not be ignored under the action of z direction earthquake, but this effect can be neglected under the action of xy direction earthquake. The results show that the efficiency and accuracy of the improved mode superposition method are better than that of the traditional mode superposition method.
【作者单位】：上海同济建设工程质量检测站;
【基金】：国家自然科学基金项目(51378379)
【分类号】：TU399

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