Double rolling isolation systems: A mathematical model and experimental validation
Double rolling isolation systems: A mathematical model and experimental validation
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DOI：
10.1016/j.ijnonlinmec.2014.01.011
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发表时间：
2014-05-01
影响因子：
3.2
通讯作者：
Gavin, Henri P.
中科院分区：
文献类型：
--
作者：
Harvey, P. Scott, Jr.;Gavin, Henri P.
滚动隔震系统(RISS)通过将水平楼层运动与隔离对象的水平响应分离，保护脆弱的建筑内容免受地震危害。目前使用的RISS的排量约为20厘米。这种置换能力可以通过堆叠两个系统来增加。本文提出并评价了双管耦合动力学的一个完整的非线性模型。该模型通过拉格朗日方程的基本形式导出，并考虑了球体在非平行表面间滚动的非完整约束。推导需要使用两个平移和旋转的参考帧。通过比较试验测得的时程和数值预测的时程以及峰值响应量、总加速度和相对位移，验证了该模型的有效性。分析了初始条件、孤立物体质量、扰动幅值和周期对系统性能的影响。(C)2014爱思唯尔有限公司。保留所有权利。
Rolling isolation systems (RISs) protect fragile building contents from earthquake hazards by decoupling horizontal floor motions from the horizontal responses of the isolated object. The RISs in use today have displacement capacities of about 20 cm. This displacement capacity can be increased by stacking two systems. This paper presents and evaluates a complete non-linear model of the coupled dynamics of double RISs. The model is derived through the fundamental form of Lagrange's equation and involves the non-holonomic constraints of spheres rolling between non-parallel surfaces. The derivation requires the use of two translating and rotating reference frames. The proposed model is validated through comparisons between experimentally measured and numerically predicted time histories and peak response quantities total acceleration and relative displacement. The effects of the initial conditions, the mass of the isolated object, and the amplitude and period of the disturbance on the system's performance are assessed. (C) 2014 Elsevier Ltd. All rights reserved.