期刊
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
卷 90, 期 -, 页码 74-87出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.soildyn.2016.08.025
关键词
Seismic isolation; Friction pendulum isolators; Performance-based engineering; Non-dimensional form; Optimal isolator properties; Power spectral density method; Soil condition
This study aims at evaluating the optimal properties of friction pendulum bearings to be employed for the seismic protection of elastic isolated structural systems under earthquake excitations with different characteristics in terms of frequency content. A two-degree-of-freedom model is considered to describe the isolated system behavior while accounting for the superstructure flexibility and a non-dimensional formulation of the governing equations of motion is employed to relate the characteristic parameters describing the isolator and structure properties to the response parameters of interest for the performance assessment. Seismic excitations are modeled as time-modulated filtered Gaussian white noise random processes of different intensity within the power spectral density method. The filter parameters control the frequency content of the random excitations and are calibrated to describe stiff, medium and soft soil conditions, respectively. Finally, multi-variate regression expressions are obtained for the optimum values of the friction coefficient that minimize the superstructure displacements relative to the base mass as a function of the structural system properties, of the seismic input intensity and of the soil condition. (C) 2016 Elsevier Ltd. All rights reserved.
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