【摘要】 2008年汶川8.0级地震后,使用相同仪器在甘肃文县县城山脚、山腰和山顶分别架设数字流动强震仪,获得12次近场强余震记录。分析表明地形起伏对于观测点的峰值加速度影响明显。山顶的加速度峰值在相同地质条件下较山脚的观测值大1.5倍左右,在记录值较大时优势频率也偏低。在强震动作用下同一地区的地形条件不同造成了地面峰值加速度和卓越频率的差异,致使山顶建筑物所受损坏程度普遍较重。初步分析结果提示对于不同地形条件下的建筑物抗震设计应有所不同。更多还原

【Abstract】 After MS8.0 Wenchuan great earthquake in 2008,we immediately installed digital strong earthquake instruments with same type near Wenxian county town,Gansu province,at mountain top,mountainside and foot of mountain respectively,and acquired 12 strong aftershock records.By analysis it is shown that difference of geography has effect to the peak ground acceleration(PGA) of observition point.The PGA values at top of mountain is 1.5 times or so to the value at foot of mountain which in same geological condition.The advantage frequency at the top of mountain are lower than at the foot of mountain,especially for that with bigger recorded values.Under strong ground motion,the differences of PGA and advantage frequency in same place caused by geography condition are main factor for earthquake damage being more serious at top of mountains.The result hints that the earthquake resistant design for engineering and building on difference geographic condition should be different.更多还原