考虑入射角和局部地形影响的地面地震动效应分析

Analysis of Ground Motion Effects Considering the Incident Angle and Local Topography

本文通过建立考虑局部地形条件的场地模型,采用粘弹性理论设置人工边界,考虑入射角进行等效地震荷载输入,对五种不同地形和坡度的场地进行地面地震动效应分析。结果表明,凹状河谷地形和凸状山脊地形相比于平地地形来说对地震动具有放大效应,坡顶的地震响应要高于坡底的地震响应,地面地震动响应大致呈现与地形类似的形状,迎波面地震响应要高于背波面地震响应。

This paper establishes a site model considering local terrain conditions,uses viscoelastic theory to set artificial boundaries,considers incident angles for equivalent seismic load input,and analyzes ground ground motion effects for sites with five different terrains and slopes.The results show that the concave valley topography and convex ridge topography have an amplifying effect on ground motions compared to flat terrain.The seismic response at the top of the slope is higher than the seismic response at the bottom of the slope,and the ground motion response roughly presents a shape similar to the terrain.The seismic response of the front wave surface is higher than that of the back wave surface.