汶川县水磨镇地震动场模拟  

Simulation of Earthquake Dynamic Field in Shuimo Town,Wenchuan County

作　　者：张皓[1] 江华伟 李宏男[1,2] 孙威 ZHANG Hao;JIANG Huawei;LI Hongnan;SUN Wei(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian,China,116024)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]大连理工大学建设工程学部,辽宁大连116024

出　　处：《沈阳建筑大学学报（自然科学版）》2022年第3期461-468,共8页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家重点研发计划项目(2018YFD1100402);国家自然科学基金重点项目(51738007)。

摘　　要：目的笔者以四川省汶川县水磨镇作为区域研究对象进行村镇区域地震动场模拟,为村镇区域的防震减灾提供理论依据。方法采用随机有限断层法与概率法得到地震动加速度反应谱;并基于弹性波动理论方法,通过该区域各点的地震动平动分量推演得到地震动扭转分量,建立基于地震动扭转分量的地震动场模型。结果通过地震危险性分析得到了该地区50年超越概率63%的地震烈度为6.3度,PGA=60cm/s^(2);超越概率10%的地震烈度为8.0度,PGA=205cm/s^(2);超越概率2%的地震烈度为9.1度,PGA=361cm/s^(2);超越概率0.5%的地震烈度为9.7度,PGA=593cm/s^(2)。结论通过对比基于地震动平动分量和扭转分量的地震动场模型可以看出,地震动扭转分量的影响不容忽视,在预测村镇区域地震风险及村镇建筑抗震设计及分析时应考虑地震动平动分量和扭转分量的综合影响。The author takes Shuimo town of Wenchuan County,Sichuan province as the regional research object to simulate the earthquake field in villages and towns in order to provide theoretical basis for earthquake prevention and disaster reduction in villages and towns.The random finite fault method and probability method are used to obtain the acceleration response spectrum of ground motion.Based on the elastic wave theory,the torsion component of ground motion was deduced from the translational component of ground motion at each point in the region,and the ground motion field model was established based on the torsion component of ground motion.Based on the seismic risk analysis,the seismic intensity of 6.3 degree,PGA=60 cm/s^(2),with a exceedance probability of 63%in 50 years was obtained.The earthquake intensity with exceedance probability of 10%was 8.0 degree,PGA=205 cm/s^(2).The seismic intensity of 2%exceedance probability is 9.1 degree,PGA=361 cm/s^(2).The intensity of the earthquake with a probability exceeding 0.5%was 9.7 degrees,PGA=593 cm/s^(2).By comparing the ground motion field models based on translational component and torsional component,it can be seen that the influence of torsional component of ground motion cannot be ignored,and the comprehensive influence of translational component and torsional component of ground motion should be considered in the prediction of earthquake risk in villages and towns and the seismic design and analysis of village buildings.

关 键 词：村镇区域 平动分量 扭转分量 随机有限断层法 地震动场 

分 类 号：TU42[建筑科学—岩土工程] P315.31[建筑科学—土工工程]