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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Civil Engineering, Architectural Engineering     
Correlation between seismic input and modal response of spherical latticed shell
XIANG Yang, LUO Yong feng, LIAO Bing, SHEN Zu yan
1. Department of Building Engineering, Tongji University, Shanghai 200092, China；
2. Shanghai Tongji Construction Quality Inspection Station, Shanghai 200092, China
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Abstract  

The dominant modes (DM) of latticed shells was obtained by analyzing the modal response characteristics in accordance with the predetermined earthquake excitation input in the frequency domain, and the efficiency of the modal superposition method (MSM) was improved. The modal response characteristics were obtained by calculating the numerical values of the modal quasistatic response, and the resonant response and the coupled response after their definitions were given. The correlation between the earthquake excitation input and the modal response was studied. The regularities of the  component responses contributing to the overall responses were obtained as well. Numerical examples show that the DM frequencies are controlled by a certain frequency range or several certain frequency ranges in accordance with the predicted excitation input. For the different frequency ranges of the total structural response, the type of the dominant modal response varies. Meanwhile, the procedure of the modified MSM was given, which takes the correlation between the structural responses and the seismic input under certain seismic zonation and site condition into consideration.

Published: 01 June 2016
CLC:  TU 391  
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XIANG Yang, LUO Yong feng, LIAO Bing, SHEN Zu yan. Correlation between seismic input and modal response of spherical latticed shell. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(6): 1040-1047.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008973X.2016.06.005     OR     http://www.zjujournals.com/eng/Y2016/V50/I6/1040


球面网壳地震动输入与振型响应的相关性

通过分析球面网壳结构对预定地震荷载谱的响应,选出对结构反应贡献较大的主振型（DM）并用于振型叠加计算,提高振型叠加法（MSM）的计算效率.为获得球面网壳在预定地震荷载谱作用下的响应规律以及研究结构振型响应与地震动输入的相关性,基于准静力响应、共振响应及耦合响应的定义,计算结构在预定地震动输入功率谱作用下的位移响应谱、准静力响应谱、共振响应谱及耦合响应谱,得出各响应分量对总响应的贡献规律.结果表明,在预定地震动输入下,球面网壳结构响应主要由某一个或几个特定频率区段的振型响应控制,在不同的频率区段,对总响应贡献最大的响应分量类型不同.给出在预定地震动区划和场地条件下,考虑地震动输入与结构响应相关性的改进振型叠加法的分析流程.

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