【摘要】 汶川地震和以往地震现场震害调查表明,局部场地地形对震害的影响明显,其中,山脚房屋震害程度明显低于山顶和水平地表土层场地。针对这一震害特征,本文以汶川主震的地形效应观测强震动记录和人工爆破山体地形地震动观测记录为基础,通过数据分析,结合动力集中质量中心差分有限元法进行数值模拟分析,进一步揭示了山脚房屋震害轻微的特征不仅与其所在场地条件良好有关,更与山脚所处山体底部的几何位置直接相关。更多还原

【Abstract】 It has been proved by the field investigation in Wenchuan earthquake and other earthquakes that the earthquake damage is greatly affected by the local site conditions.The damage level at the foot of hill is lower than that on the top of hill and at the horizontal ground surface. To study such damage characteristic, the earthquake ground motion record is analyzed based on the data from the topography effect observation array in main shock of Wenchuan earthquake and the artificial explosion.Combining the numerical simulation with the dynamic Lumped Mass-Central Difference Finite Element Method,it is further proved that,besides the good site conditions around the bottom of the hill,the low earthquake damage level at the foot of the hill is more directly related to its geometric position.更多还原