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Characterizing friction in sliding isolation bearings

机译：表征滑动隔离轴承的摩擦

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摘要

The force-displacement behavior of the Friction Pendulum (FP) bearing is a function of the coefficient of sliding friction, axial load on the bearing and effective radius of the sliding surface. The coefficient of friction varies during the course of an earthquake with sliding velocity, axial pressure and temperature at the sliding surface. The velocity and axial pressure on the bearing depend on the response of the superstructure to the earthquake shaking. The temperature at an instant in time during earthquake shaking is a function of the histories of the coefficient of friction, sliding velocity and axial pressure, and the travel path of the slider on the sliding surface. A unified framework accommodating the complex interdependence of the coefficient of friction, sliding velocity, axial pressure and temperature is presented for implementation in nonlinear response-history analysis. Expressions to define the relationship between the coefficient of friction and sliding velocity, axial pressure, and temperature are proposed, based on available experimental data. Response-history analyses are performed on FP bearings with a range of geometrical and liner mechanical properties and static axial pressure. Friction is described using five different models that consider the dependence of the coefficient of friction on axial pressure, sliding velocity and temperature. Frictional heating is the most important factor that influences the maximum displacement of the isolation system and floor spectral demands if the static axial pressure is high. Isolation system displacements are not significantly affected by considerations of the influence of axial pressure and velocity on the coefficient of friction. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：摩擦摆（FP）轴承的力-位移行为是滑动摩擦系数，轴承上的轴向载荷以及滑动表面的有效半径的函数。在地震过程中，摩擦系数随滑动表面的滑动速度，轴向压力和温度而变化。轴承上的速度和轴向压力取决于上部结构对地震的响应。地震过程中瞬间的温度是摩擦系数，滑动速度和轴向压力以及滑块在滑动表面上的移动路径的历史记录的函数。提出了一个统一的框架，以适应摩擦系数，滑动速度，轴向压力和温度的复杂相互依赖关系，以便在非线性响应历史分析中实施。根据现有的实验数据，提出了定义摩擦系数与滑动速度，轴向压力和温度之间关系的表达式。响应历史分析是在具有一系列几何和衬套机械性能以及静态轴向压力的FP轴承上进行的。使用五个不同的模型来描述摩擦，这些模型考虑了摩擦系数对轴向压力，滑动速度和温度的依赖性。如果静态轴向压力较高，摩擦加热是影响隔离系统最大位移和地板频谱需求的最重要因素。考虑轴向压力和速度对摩擦系数的影响，隔离系统的位移不会受到显着影响。版权所有（c）2014 John Wiley＆Sons，Ltd.

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