长周期地震动及其在超高层建筑抗震校验中的应用

Long-period ground motion and its application in seismic checking of super high-rise buildings

长周期地震动是由长周期面波叠加放大所形成的长持时地面运动,其孕育条件为大型沉积盆地和远距离大震级地震。长周期地震动作用下的超高层建筑震害明显。简要介绍长周期地震动的震害特点以及国内地震带、大型沉积盆地的分布特点。梳理国内外长周期地震动研究成果和关注热点。给出适用于国内的长周期地震动应对思路。探讨校验长周期地震动的形成、应用,以及超高层建筑响应控制流程。结果表明:国内较多城市有长周期地震动的孕育条件;国内工程界对长周期地震动的研究主要集中在地震动的长周期分量,而不是长周期地震动本身;对按照现行规范设计后的超高层建筑补充长周期地震动的校验分析是较为可行的思路;国内部分区域的超高层建筑有针对长周期地震动进行校验的必要。

Long-period ground motion is a long duration ground motion formed by superposition and amplification of long period surface waves. Large sedimentary basin and long distance large magnitude earthquake are its inoculation conditions. Damage of super high-rise buildings subjected to long-period ground motions is obvious. This paper briefly introduces the seismic damage characteristics of long-period ground motion, the distribution characteristics of the domestic seismic belt and large sedimentary basin. The research results and concern of the domestic and foreign on long-period ground motion are summarized. The method to deal with long period ground motion appearing in China is proposed. The formation and application of checking long-period ground motion and the response control process of super high-rise building are discussed. The results show that many cities in China possess the inoculation condition long of period ground motion. The domestic engineering circles mainly concern about the long period components of ground motion rather than long-period ground motion itself. For the super high-rise buildings designed according to the existing codes, it is a feasible and necessary to analyse their responses subjected to long period ground motion checking waves.