基于地下结构地震反应分析的阻尼模型研究  

Damping Model for Seismic Response Analysis of Underground Structure

作　　者：章莹莹 徐晟镡 舒恩 蔡海兵[2] 殷琳 ZHANG Yingying;XU Shengxin;SHU En;CAI Haibin;YIN Lin(School of Civil and Transportation Engineering,Ningbo University of Technology,Ningbo 315000,China;School of Civil Engineering,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]宁波工程学院建筑与交通工程学院,浙江宁波315000 [2]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《宁波工程学院学报》2020年第4期7-13,共7页Journal of Ningbo University of Technology

基　　金：浙江省教育厅一般科研项目(Y201533463);崇本助创基金资助项目(2019016)。

摘　　要：通过数值计算,研究了不同阻尼矩阵对地下结构-土层系统的地震反应的影响。首先,选取了上海某地铁车站为计算对象,将上海人工波作为水平输入,解得了四种阻尼矩阵模型下地下结构-土层系统的地震反应。然后,以模态叠加法的计算结果为标准,讨论了各阻尼矩阵模型对地下结构-土层系统地震反应精度的影响。计算结果表明:阻尼矩阵选择不当,可能会对地下结构-土层系统的地震反应造成50%以上的计算误差,应选择合理的阻尼矩阵进行计算以减小误差。提出的以系统第2阶频率和地震波反应谱峰值频率的平均值为第2个频率参数的阻尼模型精度最高,可以将计算误差控制在13%以内。The influence of different damping matrices on the seismic response of the underground structure soil system was studied through the numerical analysis. At first, one of an underground subway station in Shanghai was selected as an example and the seismic responses of this station were computed under the horizontal excitation of Shanghai artificial wave using four different types of damping matrices respectively. Then, the influence of damping matrices on calculation precise of seismic responses was assessed by comparing with the solutions obtained through the mode superposition method. The calculation results showed that the unreasonable damping matrix could cause over 50%errors of seismic responses of the underground structure, and a reasonable damping matrix should be selected for the calculation to reduce the error. The damping matrix proposed in this paper which took the average of the second frequency and the frequency of the seismic wave response spectrum peak as the second frequency parameter had the highest accuracy, and calculation results could be reduced to less than 13% by using this damping matrix.

关 键 词：地下结构 阻尼矩阵 地震反应 计算精度 反应谱 

分 类 号：TU435[建筑科学—岩土工程]