Modeling Reinforced Concrete Moment Frames Supported on Quintuple Friction Pendulum Bearings for Nonlinear Response History Analysis

Abstract

Base isolation systems have attained significant advancements over the past several decades, with new technologies being developed to enhance the performance of structures when subjected to moderate and severe seismic excitations. The multi-stage friction pendulum is among the most efficient systems owing to its broad range of effective pendula with several regimes that provide excellent energy dissipation abilities. Lately, a new generation of friction pendulum bearings called “Quintuple Friction Pendulum” was introduced to the literature and has since gained the attention of researchers. This isolator’s most significant advantages are the results of its capability to achieve multi-stage adaptive behavior which shows high energy dissipation capability from structures exposed to horizontal forces. Indeed, investigations that outlined the process for nonlinear modeling of structures supported on this type of isolation system are scarce. Thus, this research is intended to illustrate and discuss the approach for developing seismic code compliance finite element models for designing and analyzing reinforced concrete moment frames supported on quintuple friction pendulum bearings for nonlinear response-history analysis in OpenSees and SAP2000. As a part of the study, the nonlinearity of the isolation system and the superstructure will be considered. Moreover, the methods for overcoming essential issues such as damping leakage and isolator’s stiffness correction will be discussed. In general, the results of the discussed numerical examples have shown that both finite element packages are capable of achieving QFP hysteresis behavior as well as computing similar superstructural responses. Furthermore, the illustrated method of overcoming damping leakage provided reliable outcomes compared to the theoretical expectations. As well as the suggested approach for correcting the isolator’s initial stiffness was helpful in terms of accurately capturing the structure’s periods.

Distribution of strong input energy in base-isolated structures with complex nonlinearity: a parametric assessment

“…In this study, the NIST GCR 17-917-29.4v3 standards were utilized as a guideline to construct nonlinear models of base-isolated RC frames for code compliance in the OpenSees environment while considering both material and geometric nonlinearity. Further details about the modeling stages, assumptions and approach adopted in this study can be found in a previous publication by Habib and Yildirim (2022c). In general, a “ force-based beam-column element ” with five integration points and a set of 20 fibers was used to simulate the beams and columns in OpenSees.…”

“…(1991) discussed the nonlinear dynamic analysis of base-isolated structures. Habib and Yildirim (2022c) discussed the approach for nonlinear modeling of base-isolated structures supported on QFP bearings. On the other hand, Khashaee et al.…”

“…Nagarajaiah et al (1991) discussed the nonlinear dynamic analysis of base-isolated structures. Habib and Yildirim (2022c) discussed the approach for nonlinear modeling of base-isolated structures supported on QFP bearings. On the other hand, Khashaee et al (2003) discussed the energy distribution mechanism in base-isolated buildings where the superstructure is assumed to have rigid body motion.…”