长周期地震动作用下高层结构地震反应的对比研究

Comparative Study on Seismic Response of High-rise Structure under Long-period Ground Motions

从1999年台湾集集地震记录中分别选取4条远场长周期地震动和4条近场长周期地震动作为输入,在其能量特性分析的基础上,对比研究了某32层高层结构弹性地震反应的变化规律和差异。结果表明:随着地震动的Hilbert能量平均周期Tm E逐渐接近结构的基本周期,结构的层间剪力、楼层位移和层间位移角逐渐增大;近场长周期地震动作用下结构的层间剪力、楼层位移和层间位移角普遍大于远场长周期地震动作用下的结果,且楼层的层间位移角明显超出了1/800的限值要求,设计时应关注长周期地震动作用下结构的变形问题。

Four far-field long-period ground motions and four near-fault long-period ground motions were chosen as the seismic input from earthquake records of the 1999 Chi-Chi Earthquake at Taiwan.Based on energy property analysis,comparative study on the changes and differences of elastic earthquake response of a 32-story high-rise structure was conducted.The results show that with the Hilbert energy average period TmE is gradually close to the natural period of the structure,inter-story shear,floor displacements and inter-story displacement angles gradually increase;and these seismic response results under near-fault long-period ground motions are larger than those subjected to far-field long-period ground motions.As the inter-story displacement angles are obviously beyond the 1/800 limit requirements,deformation of the structures under long-period ground motions should be concerned.