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Optimum Values of Mechanical Properties for Lead Core Rubber Bearing (LCRB) Under Variable Pulse-Like Ground Motions

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Abstract

In this study, mechanical properties of lead core rubber bearing (LCRB) under variable pulse-like ground motions have been optimized to minimize the response quantities of interest at the level of the base isolation system, e.g., bearing acceleration and bearing displacement. Since the isolator period, effective damping ratio, superstructure mass, design displacement, and yielding displacement are major parameters that characterize the general behavior of the base isolation system, they have been selected as random variables. A single degree of seismically-isolated building as a shear beam-stick model has been implemented. Then, the dynamic response of the seismic isolation system is investigated considering the variability of mechanical properties of LCRB and superstructure mass over the base isolation system. In this investigation, the isolation device is developed using the Bouc–Wen model of hysteresis. To this end, Monte Carlo simulation has been conducted to provide comprehensive insight into the variability of seismic responses. Thus, 37,800 time-history analyzes have been performed and the effect of levels of uncertainty of the input parameters on the seismically isolated building's dynamic response is studied for 126 natural pulse-like ground motions whose pulse periods are between 0.6 and 13 s. Moreover, to find the best compound properties of LCRB parameters, the “desirability function optimization” method has been employed. Finally, the behavior of the LCRB has been optimized and increased its effectiveness to reduce the response criteria considering uncertainties in natural excitation parameters.

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  1. Civil Engineering Department, Cyprus International University, Via Mersin 10, Nicosia, Cyprus, Turkey

    Mohammad Reza Bagerzadeh Karimi

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Bagerzadeh Karimi, M.R. Optimum Values of Mechanical Properties for Lead Core Rubber Bearing (LCRB) Under Variable Pulse-Like Ground Motions. Int J Steel Struct 23, 780–794 (2023). https://doi.org/10.1007/s13296-023-00728-0

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  • DOI: https://doi.org/10.1007/s13296-023-00728-0

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