高层结构非线性地震反应分析

摘要

Two long-period seismic waves with abundant long-period information were selected from earthquake records databases from all over the world. The frequency and spectrum characteristics of these two seismic waves were investigated with the orthogonal HHT (Hilbert-Huang transform) method, and compared with those of two commonly used seismic waves. A complex high-rise building was selected as a case study, in which a finite element model was established with the ANSYS software, and nonlinear dynamic response analysis was conducted on the complex high-rise building with the four seismic waves mentioned above as an input. The results show that the complex high-rise building has different effects in filtering seismic waves, and it can filter long-period seismic waves significantly. In addition, the structure’ s seismic response to long-period seismic waves is greater than it is to common seismic waves, and the displacement response is more significant than the acceleration responses.%从国内外地震记录库中挑选出2条具有丰富长周期信息的长周期地震波，利用正交化 HHT法对2条地震波进行时频特征分析计算，同时以2条常用地震波为参照，进行时频特征的比对分析。然后，以一实际高层结构为例，利用 ANSYS 有限元软件建立有限元数值模型，分别以前4条地震波为输入，进行该高层结构的非线性动力反应分析。结果表明：高层结构对不同类型地震波的过滤作用不同，对长周期地震波的过滤作用更加明显；长周期地震波作用下的结构响应明显大于普通地震波作用下的结构响应，其中位移响应较加速度响应明显。