含破碎带层状场地和均匀场地地震响应比较研究

韩红霞1,2 梁建文2,3

振动与冲击 ›› 2017, Vol. 36 ›› Issue (1) : 75-81.

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (1) : 75-81.
论文

含破碎带层状场地和均匀场地地震响应比较研究

  • 韩红霞1,2      梁建文2,3
作者信息 +

Comparing seismic responses of a layered site with fault fracture zone and a homogeneous site

  • HAN Hongxia1,2, LIANG Jianwen2,3
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文章历史 +

摘要

采用有限元方法在时域内研究了含破碎带层状场地的地震响应,比较分析了含破碎带层状场地和等效均匀场地对地震响应影响的差别,以及破碎带宽度、刚度和倾角等因素对地震响应的影响。研究表明,与等效后的均匀场地相比,层状场地加速度反应谱卓越周期短、对地震动的放大作用大,当场地中存在破碎带时,层状场地中破碎带对地震波的散射效应更强,其竖向加速度的最大峰值显著大于等效均匀场地。断层破碎带宽度、刚度、倾角对地震动的影响规律与等效均匀场地基本一致,不同的是:层状场地地表加速度峰值均大于等效均匀场地;层状场地加速度反应谱的第一峰值与等效均匀场地相近,第二峰值大于等效均匀场地,其值受破碎带宽度和倾角的影响较大。

Abstract

Here, the seismic response of a layered site with fault fracture zone was studied by using the finite element method in time domain, and the effects of a layered site and an equivalent homogeneous site on their seismic responses were analyzed comparatively. The effects of width, stiffness and inclined angle of fault fracture zone on seismic response were also analyzed. It was shown that the predominant periods of the layered site are shorter and the amplification of its seismic ground motion is larger compared with those of the equivalent homogeneous site; when there is a fault fracture zone in the layered site, the scattering effect of fault fracture zone on seismic wave may be stronger, and the maximum peak of vertical acceleration of the layered site is much larger than that of the equivalent homogeneous site; the effects of width, stiffness and inclined angle of fault fraction zone on seismic ground motion of the layered site are roughly consistent with those of the equivalent homogenous site; the difference is that the maximum peak of ground surface acceleration of the layered site is larger than that of the equivalent homogenous site, in addition, the first peak of the acceleration response spectrum of the layered site is similar to that of the equivalent homogenous site but the second peak of the former is larger than that of the latter, it is greatly affected by width and inclined angle of fault fracture zone.

关键词

断层破碎带 / 地震动 / 层状场地 / 反应谱

Key words

fault fracture zone / ground motion / layered site / response spectrum

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导出引用
韩红霞1,2 梁建文2,3. 含破碎带层状场地和均匀场地地震响应比较研究[J]. 振动与冲击, 2017, 36(1): 75-81
HAN Hongxia1,2, LIANG Jianwen2,3. Comparing seismic responses of a layered site with fault fracture zone and a homogeneous site[J]. Journal of Vibration and Shock, 2017, 36(1): 75-81

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