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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。
After the Wenchuan Ms 8.0 earthquake in 2008, digital flow strong seismometers were set up at the foot, hillside and peak of Wen County, Gansu, respectively, and 12 near-field strong aftershocks were recorded. The analysis shows that the relief of the terrain has a significant impact on the peak acceleration of the observation point. Peak peak acceleration in the same geological conditions than the foot of the observation of 1.5 times larger, the larger the recorded value of the dominant frequency is also low. In the same area under the action of strong vibration, the difference of peak acceleration and excellent frequency caused by different terrain conditions, resulting in the damage of the hilltop buildings generally heavier. The preliminary analysis results suggest that the seismic design of buildings should be different for different topographic conditions.