基于强震动观测的山体地形效应研究

项目名称： 基于强震动观测的山体地形效应研究

项目编号： No.51308118

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 王伟

作者单位： 防灾科技学院

项目金额： 25万元

中文摘要： 地震动的山体地形效应问题属于局部场地条件对地震动的影响范畴。研究表明，不规则山体地形对地面运动的影响主要体现在使局部地表地震动放大并在空间分布上呈现非均匀性。以汶川地震和余震中获得的山体地震动记录，以及人工爆破山体地形地震动记录为基础数据，结合汶川地震山体地形的震害调查资料，通过地震动记录分析和数值模拟揭示山体地形效应。主要研究工作包括：（1）通过对山体地形地震动记录的处理分析，研究山体地震动的特征；（2）研究在震源和传播路径相同的情况下，山体地形与周围土层场地对地震动反应的不同作用机制，并采用集中质量显式有限元法结合多次透射人工边界进行真实地震动输入下的数值模拟计算和验证；（3）利用山体地震动记录的质点轨迹图，分析山体地震动的质点运动主方向的偏转效应，研究该效应与山体结构构造、入射地震动要素之间的关系；（4）基于地震动能量谱的概念，研究山体地形地震动影响系数的确定方法。

中文关键词： 山体地形；强震动记录；能量谱；偏振效应；数值模拟

英文摘要： Effect of hill topography on the ground motion is in the field of local site conditions affecting the ground motion. Study shows that the amplification of ground motion at local site and variation with space distribution are the main effects of irregular hill topography on ground motion. Based on the ground motion record from the main shock and aftershocks of Wenchuan earthquake, and the artificial explosion, the hill topography effect on the ground motion is analyzed and studied, combining with the topographic earthquake damage data of Wenchuan earthquake. The main study work is as follows:(1) By processing and analyzing the hill topographic ground motion record data, the basic characteristics of the hill ground motion are studied. (2) Study the different ground motion response mechanism of hill and its surrounding soil layer site under the input ground motion from the same source and propagation path. The numerical simulation and verification is carried out with the lumped-mass explicit finite element method in combination with the multi-transmitting artificial boundary. (3) Analyze the deflection effect using the particle motion trace of the hill ground motion. Study the relationship between the polarization effect and the hill structure, the input ground motion factor.(4) Study how to determine the earthqua

英文关键词： topography；strong motion record；energy spectra；polarization effect；numerical simulation