倾斜基岩上的土-框架相互作用研究  

Study on dynamic interaction problem of frame on inclined rock-base

作　　者：杨佑发[1] 王一功[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045

出　　处：《地震工程与工程振动》2005年第2期177-182,共6页Earthquake Engineering and Engineering Dynamics

基　　金：重庆市建委项目(200437)

摘　　要：倾斜基岩上的框架是山地、丘陵地区多见的一种结构形式,但以往对其抗震性能研究很少。本文利用二次开发后的ANSYS对倾斜基岩上的框架的抗震性能进行了上下部相互作用分析。在研究中发现,考虑土-结相互作用后,结构的高阶振型在地震反应中的参与程度提高;可能在结构的地震反应傅里叶谱中形成双峰;并使地震反应沿结构高度的分布不再沿直线变化,而呈锯齿状分布。由于倾斜基岩将降低土层对地震波的放大作用,但基本不改变地基的卓越频率,因此倾斜基岩将会抑制上部结构的地震反应;而倾斜基岩上结构的地震反应分布将比相应平坦基岩上结构的地震反应分布更接近直线形分布,但变化形状基本相同。The frame on the inclined rock-base often appears in mountainous region. But the study of its seismic behavior is seldom made. Such frame’s seismic behavior is studied by the ANSYS with secondary development. It has been found out that such frame’s seismic behavior is largely influenced by ground. The higher modes of structure will more attach themselves to the motion. So there are two peak values in the Fourier spectrum and the distribution of earthquake response becomes saw-tooth shape distribution. Because the inclined rock-base attenuates the magnification of soil but changes little predominant frequency of soil, the inclined rock-base will restrain the response of structure and the distribution of earthquake response will be more near to linear but the shape will little change.

关 键 词：倾斜基岩 上下部共同作用 多次透射边界 

分 类 号：P315.98[天文地球—地震学] TU43[天文地球—固体地球物理学]