姚安65级地震中房屋震害差异的原因分析

Cause Analysis of Damaging Difference of Building in the Yao'an M6.5 Earthquake

牟定、大姚、南华三县人民银行办公楼为相同的、同期竣工的 2～ 5层钢筋砼框架结构建筑 ,原设计梁截面配筋满足设计荷载要求。在 2 0 0 0年 1月 15日姚安 6 5级地震中同处在等烈度线Ⅵ度区内 ,受到的破坏却有显著差异 ,破坏程度并不随震中距增大而渐轻 ,反之有随震中距增大破坏还更重的情况。指出 ,主要原因在于场地条件不同 ,其依据是 :在相同地震动力作用下 ,三个场地的地震反应不同 ,地表加速度峰值愈大破坏愈重。

The office buildings of China People's Bank in Muding,Dayao and Nanhua had same constructions with steel concrete and finished at same time. The originally designed section of roof beam was satisfied with loading need. Those buildings were located in same intensity VI in the Yaoan M6 5 earthquake on January 152000,however,the damaging degrees were quite different.Their damages were not decreased with the epicentral distance increasing,but heavier with the distance. It is pointed out that the main cause is different site conditions. The evidence is that the seismic responses were different at the 3 sites under the function of same seismic vibration. The bigger of the peak value of the ground acceleration the heavier the damage.