长周期地震动盆地效应表征模型的数值模拟

项目名称： 长周期地震动盆地效应表征模型的数值模拟

项目编号： No.41204046

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地球物理学和空间物理学

项目作者： 李一琼

作者单位： 中国地震局地球物理研究所

项目金额： 26万元

中文摘要： 研究表明，盆地结构对长周期地震动有明显的放大作用，会产生诸如幅值加大、持续时间变长等效应。这一地震动盆地效应对于高层建筑、桥梁之类的自振周期较长的工程结构体极为不利。当前在许多城市，高层建筑，城市道路立交桥及其它生命线工程日益增多。这对城市规划和工程建设提出新要求。尤其是在地处盆地内或边缘的城市，需要特别关注这类工程的地震安全性，而抗震设计规范中很少对这类地震动盆地效应做具体的规定。因此，定量研究表征模型长周期地震动盆地效应是非常必要的。本项目拟利用申请人先前发展的辛格式离散奇异褶积微分算子（SDSCD）保结构算法，设定远场大震的震源输入，开展受盆地结构影响的长周期地震动数值模拟工作。通过构建多种盆地模型，定量研究盆地模型参数对地震动峰值、反应谱和持时的影响规律，得到放大效应的时空强弱变化，为提出满足工程需要的长周期地震动盆地效应的评估方法奠定基础，为重大工程防震减灾提供更可靠的科学依据。

中文关键词： 长周期地震动；数值模拟；盆地效应；表征模型；

英文摘要： Studies have shown that long-period ground motions can be amplified due to basin structure, the amplification effects generate such as the amplitude increased, the duration lengthened. The basin effects of ground motions are extremely detrimental to engineering structures of long natural vibration period, such as high-rise buildings and bridges. The number of high-rise buildings, urban road overpasses and other lifeline engineerings is increasing in many cities. It is a new demand on urban planning and construction. It needs special attention to the seismic safety of such works, especially in those cities situated in the basin regions. However, the basin effects of ground motions are rarely considered in the building code of China. Therefore, it is necessary to quantitatively study the basin effects of long-period ground motions in characterization models. The project intends to carry out the numerical simulation of long-period ground motions on basin effects, which uses previous developed by the applicant structure-preserving algorithm, symplectic discrete singular convolution differentiator (SDSCD), and uses far-field earthquake input. It will quantitatively study the impact of the basin model parameters to ground motions peak value, response spectrum and duration by constructing several basin models to obtai

英文关键词： long-period ground motions；numerical simulation；basin effects；characteristic models；