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Restoring capability of friction pendulum seismic isolation systems

机译：摩擦摆隔震系统的恢复能力

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摘要

The restoring (or re-centring) capability is an important feature of any isolation system and a fundamental requirement of current standards and guideline specifications for the design of seismically isolated structures. In this paper, the restoring capability of spherical sliding isolation systems, often referred to as friction pendulum systems (FPSs), is investigated through an extensive parametric study involving thousands of non-linear response history analyses of SDOF systems. The dynamic behavior of the isolation system is described with the visco-plastic model of Constantinou et al. (J Struct Eng 116(2):455-474, 1990), considering the variability of the friction coefficient with sliding velocity and contact pressure. Numerical analyses have been carried out using a set of approximately three hundred natural seismic ground motions recorded during different earthquakes and differing in seismic intensity, frequency content characteristics, magnitude, epicentral distance and soil characteristics. Regression analysis has been performed to derive the dependency of the residual displacement from the parameters governing the dynamic response of FPS. The influence of near-fault earthquakes and the accumulation of residual displacements due to real sequences of seismic ground motions have been also investigated. Finally, the restoring compliance criteria proposed in this study are compared to the lateral restoring force requirements of current seismic codes. Based on the results of this study, useful recommendations for a (more) rational design of FPSs are outlined.
机译：恢复（或重新定心）功能是任何隔离系统的重要功能，也是当前地震隔离结构设计标准和准则的基本要求。在本文中，通过涉及SDOF系统的数千次非线性响应历史分析的广泛参数研究，研究了通常称为摩擦摆系统（FPS）的球形滑动隔离系统的恢复能力。用Constantinou等人的粘塑性模型描述了隔离系统的动态行为。 （J Struct Eng 116（2）：455-474，1990），考虑了摩擦系数随滑动速度和接触压力的变化。使用一组在不同地震期间记录的大约三百种自然地震地面运动进行了数值分析，这些地震在地震烈度，频率含量特征，震级，震中距离和土壤特征方面都不同。已经进行了回归分析，以从控制FPS动态响应的参数中得出残余位移的依赖性。还研究了近断层地震的影响以及由于地震地震动的真实序列引起的残余位移的累积。最后，将本研究中提出的恢复顺应性标准与当前地震规范的横向恢复力要求进行了比较。根据这项研究的结果，概述了FPS的（更多）合理设计的有用建议。

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