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基于虚拟激励法的沉积盆地场地地震反应分析

王淮峰, 楼梦麟, 陈希, 翟永梅

王淮峰, 楼梦麟, 陈希, 翟永梅. 基于虚拟激励法的沉积盆地场地地震反应分析[J]. 岩土工程学报, 2013, 35(2): 337-347.
引用本文: 王淮峰, 楼梦麟, 陈希, 翟永梅. 基于虚拟激励法的沉积盆地场地地震反应分析[J]. 岩土工程学报, 2013, 35(2): 337-347.
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WANG Huai-feng, LOU Meng-lin, CHEN Xi, ZHAI Yong-mei. Pseudo-excitation method for seismic response analysis of sedimentary basin[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(2): 337-347.
Citation: WANG Huai-feng, LOU Meng-lin, CHEN Xi, ZHAI Yong-mei. Pseudo-excitation method for seismic response analysis of sedimentary basin[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(2): 337-347.
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基于虚拟激励法的沉积盆地场地地震反应分析  English Version

  • 1. 同济大学土木工程防灾国家重点实验室，上海 200092; 2. 同济大学建筑工程系，上海 200092; 3. 同济大学上海防灾救灾研究所，上海 200092

基金项目: 国家自然科学基金项目（90915011）；科技部国家重点实验室基础研究项目（SLDRCE08-B-01)
详细信息
    作者简介:

    王淮峰（1986– ），男，博士，主要从事土–结构动力相互作用及复杂场地土层地震响应的研究。E-mail: forgotten.wang@yahoo.com.cn

  • 中图分类号: TU43

Pseudo-excitation method for seismic response analysis of sedimentary basin

  • 1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China; 2. Department of Civil Engineering, Tongji University, Shanghai 200092, China; 3. Shanghai Institute of Disaster Prevention and Relief, Tongji University, Shanghai 200092, China

摘要

    摘要
  • 摘要: 基于四川盆地及台北盆地震害分布的差异，将虚拟激励法与有限单元法结合，应用于场地的随机地震反应分析中。将沉积盆地截面简化成等腰梯形，建立二维平面应变模型，通过数值试验，研究了沉积盆地场地的地震反应，探讨了盆地效应的影响参数。主要结论如下：①由于地震波在盆地边缘的反射效应，盆地场地表面的地震反应较成层场地有较大的改变，水平加速度标准差可提高150%；场地边缘附近的竖直加速度标准差与水平加速度标准差量级相当；②当盆地宽度较大时，盆地边缘仅对场地边缘附近的地震反应有较大影响，影响范围大概为1倍（以水平加速度标准差为评价标准）或者3倍（以竖直加速度标准差为评价标准）盆地边缘倾斜基岩面的水平投影长度；③随着盆地深度的增加，盆地场地表面的最大水平及竖直加速度标准差增加；④随着土层剪切波速的增加，盆地场地表面的最大水平加速度标准差几乎不变，但最大竖直加速度标准差减小。
    Abstract: The spatial distributions of disasters in Taipei Basin and Sichuan Basin are different. A series of two-dimensional plane strain models for sedimentary basins, the cross sections of which are simplified to isosceles trapezium, are established to analyze the seismic response of sedimentary basins and to study the major influencing parameters of basin effect. It is concluded that because of the reflection of seismic waves at the boundary of basins, contrasted to horizontal layered sites, the seismic response of basin sites makes a large difference. The standard deviation of horizontal acceleration may rise by 150%, and the standard deviation of vertical acceleration is corresponding to that of horizontal acceleration in magnitude. If the size of basins is relatively large, the basin effect just has a relatively distinct impact on the seismic response of the edge of basins, and the incidence is approximately equal to the projected length of the inclined bedrock surface at the edge of basins, concluded by the standard deviation of horizontal acceleration, or triple of that, concluded by the standard deviation of vertical acceleration. The maximum standard deviation of acceleration increases with the increase of the depth of basin sites. The maximum standard deviation of horizontal acceleration remains virtually unchanged and that of vertical acceleration reduces with the increase of shear wave velocity of soil.
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出版历程
  • 收稿日期:  2012-05-02
  • 发布日期:  2013-03-06

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