复合地基褥垫层上结构水平地震响应分析  

Nonlinear Response Analysis of Structures with Composite Foundation Cushion under Horizontal Ground Motion

作　　者：白举科[1,2] 陈龙珠[1] 

机构地区：[1]上海交通大学船建学院安全与防灾工程研究所,上海200240 [2]辽宁工程技术大学,辽宁阜新123000

出　　处：《工程抗震与加固改造》2009年第2期55-59,31,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(50478022);上海市重点学科建设项目(B208)

摘　　要：采用Wilson-θ法,分析了复合地基碎石褥垫层上结构在不同地震动参数El-Centro波作用下的动力反应,假设上部结构为摩擦隔震结构,得到了结构在不同强度地震作用下的动力反应,并与基底固定结构进行了比较。采用了减震系数μr来评价减震的效果,分析结果表明:褥垫层对上部结构有明显的减震作用,并且减震效果随垫层与基础间摩擦系数的减小而显著增加;减震效果还与输入的地震动大小有关,输入的地震动越大,μr值越小。In this paper, Wilson-θ＇s time integration scheme is used to analyze the structures with composite foundation cushion. The superstructure is a base-friction-isolated structure, which is isolated from the foundation by the cushion and the friction coefficient between the cushion and the base is constant. Then, the nonlinear responses of structures under El-Centro wave with different seismic parameters are obtained, and the responses are also compared with that of the fixed base structure. Seismic-reduction factor, μr, is introduced to evaluate the vibration reduction effectiveness. With the decreasing of the friction coefficient, vibration reduction improves obviously. It also indicates that the effectiveness of vibration reduction is correlated with the intensity of input seismic wave; the more intensive the seismic input, the less the value of μr.

关 键 词：复合地基 褥垫层 非线性反应 摩擦隔震结构 减震 

分 类 号：TU435[建筑科学—岩土工程] TU311.3[建筑科学—土工工程]