【作者】 刘卫然；

【导师】 魏建国；

【作者基本信息】 河北农业大学 ， 结构工程， 2006， 硕士

【摘要】 隔震结构体系是区别于传统抗震结构体系的一种被动控制体系,通过设置隔震层来吸收并消耗地震能量,减小结构的地震反应,确保结构的安全。隔震结构体系改变了传统抗震结构体系的耗能原理,即通过隔震层的耗能装置、而不是结构和结构构件来吸收并消耗地震能量,这种优越的耗能特性是传统抗震结构体系所不能够实现的。摩擦摆系统(Friction Pendulum System:FPS)是由Zayas提出的一种隔震系统,该系统特有的圆弧滑动面使其具有自限、复位机制和良好的振动稳定性,且便于工程实现,本文主要研究摩擦摆隔震系统的不同参数的变化对基础隔震结构动力反应的影响。本文选取一个6层结构作为研究对象。利用有限元sap2000软件对结构进行建模,结构计算模型考虑层间剪切变形,上部结构层间刚度采用线弹性模型。对此框架结构的地震反应进行了分析,并比较固定基础结构和基础隔震建筑在地震荷载作用下的反应特性,分析其隔震效果。结果表明:摩擦摆隔震系统具有明显的减震效果,它大大降低了地震作用下的结构的峰值反应。此外,隔震层摩擦系数μ和滑道半径R是摩擦滑移隔震结构设计的主要因素。根据时程分析结果可见,在一定范围内增加隔震层的摩擦系数μ和降低滑道半径R,能有效控制基底最大滑移量,但同时会增加上部结构的地震反应,给结构带来一些不利的影响。更多还原

【Abstract】 Seismic isolated structure system is a passive active control system, which is different from traditional anti-seismic structure system. Through setting isolation layer, earthquake energy is absorbed and dissipated and earthquake response of structure is reduced, so that the safe of structure is ensured. Seismic isolated structure system changes the energy dissipation mechanism of traditional anti-seismic structure, the earthquake energy is absorbed and dissipated by energy dissipative device setting in a isolation layer rather than by the structure and structure elements. This excellent energy dissipation characteristic can not be realized by traditional anti-seismic structure. The Friction Pendulum System (FPS) is presented by Zayas, which make use of a spherical concave surface to provide a restoring force and good vibration stabilities, and it can be used in structure system. In this paper. the different parameters of The Friction Pendulum System (FPS) isolation devices are disscussed, the optimal range of parameters are obtained.As a example of one six-storey structure is studied by the finite element analysis program sap2000, the mechanical model of the whole structure is the story-shear model, the superstructure uses the elastic model. seismic response of isolated structures is analyzed and compared with that of fixed base structures, Analysis results indicate that FPS technology has obviously seismic isolating effect, and decreases maximum response of structure sharply when earthquake occurs .Moreover, coefficient of friction μ and the radius of spherical concave surface R are the main factors of the structural design. According to time history analysis results, by increasing coefficient of friction μ and decreasing the radius of spherical concave surface R within the specific limits, the sliding displacement can be controlled, but the seismic response of structure increased at the same time, and some unfavorable influence of structure is brought, too.更多还原