远场地震动对高层建筑地震反应的影响
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摘要
随着我国城市经济的快速发展,兴建了大量各种结构类型的高层建筑。而在近年来的一些大地震中,出现了远场地震作用引起的高层建筑的震害。针对此类震害现象,对盐城III类和IV类场地中的8栋高层建筑分别进行了在设计地震分组第二组(近场)和第三组(远场)的不同烈度设计基本地震作用(中震)下的地震反应分析,对比了在不同水准近场和远场地震作用下的结构最大层间位移角,总结了近场和远场地震作用对软弱土场地上高层建筑地震反应的影响规律,建议位于软弱土场地上的高层建筑在抗震设计时,需考虑远场地震作用的影响以确保其地震安全。
With the rapid economic development,all kinds of structure types of high-rise buildings have been constructed more and more in cities. In recent earthquakes,the seismic damage to high-rise buildings was caused by far-field ground motions. For this kind of earthquake damage phenomenon,the seismic response analysis of 8 highrise buildings on site-class III and IV in Yancheng under the condition of the second design earthquake group( near-field) and the third design earthquake group( far-field) was conducted; the maximum story drift rotations of buildings in different seismic levels subjected to near-field and far-field ground motions were compared; the principle of seismic response of high-rise buildings on soft soil sites influenced by the near-field and far-field ground motions was provided. It was suggested that the far field ground motions influence on high-rise buildings located on the soft soil sites should be considered so as to ensure the seismic safety.
With the rapid economic development,all kinds of structure types of high-rise buildings have been constructed more and more in cities. In recent earthquakes,the seismic damage to high-rise buildings was caused by far-field ground motions. For this kind of earthquake damage phenomenon,the seismic response analysis of 8 highrise buildings on site-class III and IV in Yancheng under the condition of the second design earthquake group( near-field) and the third design earthquake group( far-field) was conducted; the maximum story drift rotations of buildings in different seismic levels subjected to near-field and far-field ground motions were compared; the principle of seismic response of high-rise buildings on soft soil sites influenced by the near-field and far-field ground motions was provided. It was suggested that the far field ground motions influence on high-rise buildings located on the soft soil sites should be considered so as to ensure the seismic safety.
引文
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