长周期地震荷载作用下高层建筑动力特性分析

Analysis of theDynamic Characteristics of High-rise Buildings Under Long-period Earthquake Loads

相关研究表明,长周期地震荷载通常与地震波的低频成分相关,这些低频成分可能会引起建筑结构的共振现象,从而导致较大的动力响应。为研究长周期地震荷载对高层建筑动力特性的影响规律,文中首先基于PEER强震数据库选取若干具有不同频谱特性的实测地震动记录,以某高层建筑工程为研究对象,对比模型位移、层间角和内力响应,探讨长周期地震荷载对高层建筑动力响应的影响规律。结果表明,与普通地震动相比,长周期地震反应谱有着较宽的反应谱敏感区,能够引起结构更大的地震响应。文中以三次地震的实测地震波为例,在长周期地震作用下,结构层间角和底部截面弯矩峰值平均增大约2.5倍和2.3倍。

Research indicates that long-period earthquake loads are typically associated with the low-frequency components of seismic waves,which may induce resonance phenomena in building structures,leading to significant vibration responses.To investigate the influence patterns of long-period earthquake loads on the dynamic characteristics of high-rise buildings,this study firstly selects several measured seismic records with different spectral characteristics from the PEER strong motion database.A specific high-rise building project is chosen as the research subject.By comparing model displacements,inter-story drifts,and internal force responses,the impact of long-period earthquake loads on the dynamic responses of high-rise buildings is explored.The research findings demonstrate that,compared to conventional seismic loads,longperiod earthquake loads exhibit wider response spectrum sensitive zones,thereby causing larger seismic responses in structures.Taking measured seismic waves selected from three seismic events as examples,under the action of long-period earthquake loads,the inter-story drifts and bottom section bending moment peaks of structures increase on average by approximately 2.5 times and 2.3 times,respectively.