土层地震行波反应分析中侧向人工边界的影响

土层地震行波反应分析中侧向人工边界的影响 English Version

基金项目: 国家自然科学基金资助项目(50278070);;863 计划资助项目(2002AA615110);;国家电力公司资助项目(G-1/KJ-00)

1.Department of Civil engineering Tsinghua University Beijing 100084 China 2. State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China

摘要: 假定土层为线性粘弹性介质,主要探讨了行波地震输入作用下采用有限元法分析均匀土层时有限土域的取值范围对计算精度的影响。在频域内分析了土层地震反应随不同侧向人工边界、迫振频率、阻尼、土层长深比和地震波传播速度的变化规律,以及水平方向和垂直方向土层地震反应的特点。应用所得的计算成果对一河谷地形的土层进行地震反应分析,计算结果表明采用本文土层范围取值来确定土域的计算范围可以得到满意的结果。
- 地震反应 /
- 行波效应 /
- 人工边界
Abstract: Based on linear visco-elastic assumption, the precision of results influenced by the scope of soil region is analyzed when seismic excitations are traveling waves. In frequency domain, the seismic response of soil layer varying with artificial boundary, damp coefficient, exciting frequency, the ratio of width and depth of soil layer, and the apparent velocity of earthquake wave is discussed. At the same time, the characteristics of horizontal and vertical seismic response are analyzed. Based on above conclusion, the seismic response of a river-crossing topography is calculated. The results show that the scope of soil layer is used to determine the parameters of soil satisfy aetory.
- seismic response /
- wave passage /
- artificial boundary