坡地地形对地震动特性的影响分析

郝明辉; 张郁山; 赵凤新

doi:10.11899/zzfy20210201

坡地地形对地震动特性的影响分析

doi: 10.11899/zzfy20210201

中国地震灾害防御中心，北京 100029

基金项目: 国家重点研发计划（2018YFC1504601）；中央级公益性科研院所基本科研业务专项（ZDJ2020-09）

详细信息

作者简介:
郝明辉，女，生于1983年。高级工程师。主要从事复杂场地地形效应、结构抗震方面的研究。E-mail：minghuimail@126.com

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出版历程
- 收稿日期: 2021-01-29
- 刊出日期: 2021-06-30

Analysis of Slope Terrain Effect on the Properties of Ground Motion

China Earthquake Disaster Prevention Center, Beijing 100029, China

摘要

摘要: 采用有限元有限差分方法，结合人工透射边界理论，研究局部坡地地形对地震动特性的影响，分析坡高、坡角对地形放大效应的影响。研究结果表明：坡地地形斜坡段各点反应谱谱比最大值沿坡高逐渐增大，坡脚点对地震动反应谱谱比呈缩小效应；坡底段各点反应谱谱比接近1；坡起平台段空间点受地形效应的影响较大；坡高和坡角对地形效应的影响较明显，当坡角不变时，不同坡高反应谱谱比曲线形状基本相同，峰值点对应的特征周期随着坡高的增加呈增长趋势，峰值点对应的反应谱谱比随着坡高的增加呈增大趋势，斜坡顶点阿里亚斯烈度比值在地形坡高超过一定数值后随着坡高的增加呈增大趋势；当坡高不变时，大部分频段内反应谱谱比最大值随着坡角的增加逐渐增大，斜坡顶点阿里亚斯烈度比值在坡角达到一定数值后随着坡角的增加呈增大趋势。
- 地形效应 /
- 坡地 /
- 反应谱谱比 /
- 坡高 /
- 坡角 /
- 阿里亚斯烈度
Abstract: Based on the finite element finite difference method and the theory of artificial transmission boundary, the influence of local slope terrain on ground motion characteristics (including response spectrum, peak acceleration, peak velocity, peak displacement and arias intensity) is studied, and the influence of slope height and slope angle on ground shape amplification effect is analyzed. The results show that: the maximum response spectrum ratio of each point on the slope section of slope terrain gradually increases along the slope height, and the maximum value is not more than 1.3; the slope toe point has a narrowing effect on the response spectrum ratio of ground motion; the spectrum ratio of each point on the bottom section of slope is close to 1; the spatial point on the platform section is greatly affected by the terrain effect, and gradually decreases with the distance from the top of slope. The height and slope angle of slope terrain have obvious influence on terrain effect. When the slope angle is constant, the shape of the spectral ratio curve of different slope heights is basically the same, the characteristic period corresponding to the peak point increases with the increase of height, and the spectral ratio corresponding to the peak point also increases with the increase of height. When the terrain height exceeds a certain value, the ratio of arias intensity at the top of slope increases with the increase of height; when the slope height is constant, the maximum value of response spectrum ratio in most frequency bands also increases with the increase of slope angle. And the ratio of arias intensity at the top of the slope increases with the increase of the slope after reaching a certain slope angle.
- Terrain effect /
- Slope terrain /
- Response spectrum ratio /
- Terrainheight /
- Terrain slope /
- Arias intensity

HTML全文

图 1 局部坡地模型

Figure 1. A model with local terrain

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图 2 输入地震动时程曲线

Figure 2. Acceleration, velocity and displacement curves of artificial ground motion samples

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图 3 数值解与理论解比较

Figure 3. Comparison of viscous-elastic boundary calculated results with the theoretical solution

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图 4 坡底段地表点反应谱谱比曲线

Figure 4. Spectral ratio chart of surface point on bottom

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图 5 斜坡段地表点反应谱谱比曲线

Figure 5. Spectral ratio chart of surface point on the slope

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图 6 平台段地表点反应谱谱比曲线

Figure 6. Spectral ratio chart of the surface point on the platform

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图 7 斜坡顶点反应谱谱比随坡高变化曲线

Figure 7. Spectral ratio curve of the vertex with different heights

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图 8 斜坡脚点反应谱谱比随坡高变化曲线

Figure 8. Spectral ratio curve of the Slope toe with different heights

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图 9 不同周期点处斜坡顶点反应谱谱比随坡高变化曲线

Figure 9. Variation curve of slope peak spectral ratio with height at different periodic points

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图 10 斜坡顶点阿里亚斯烈度比值随坡高变化曲线

Figure 10. Curve of arias intensity ratio with height at the top of slope

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图 11 地表点阿里亚斯烈度比值

Figure 11. Arias intensity ratio map of surface points

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图 12 不同坡角对应的斜坡顶点的反应谱谱比曲线

Figure 12. Spectral ratio curve of the vertex with different slopes

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图 13 不同周期点处反应谱谱比随坡角变化曲线

Figure 13. Variation curve of slope peak spectral ratio with slope at different periodic points

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图 14 斜坡顶点阿里亚斯烈度比值随坡角变化曲线

Figure 14. Curve of arias intensity ratio with slope at the top of slope

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