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Modeling of Lead Rubber Bearings via 3D-BASIS, SAP2000, and OpenSees Considering Lead Core Heating Modeling Capabilities

Zafer Kanbir 1, Gökhan Özdemir 2, and Cenk Alhan 1
1. Istanbul University, Department of Civil Engineering, Istanbul, Turkey
2. Anadolu University, Department of Civil Engineering, Eskisehir, Turkey
Abstract—Seismic isolation systems can be modeled in various structural analysis programs using nonlinear or equivalent linear properties of isolators. The effort required and the accuracy of the results depend on the program and the modeling method used. In this study, three commonly used structural analysis programs, namely SAP2000, 3D-BASIS, and OpenSees, are studied considering modeling of Lead Rubber Bearings (LRBs) by means of linear and nonlinear representations. Base displacement (BD) and top floor acceleration (TFA) responses obtained from time history analyses under Kocaeli and Chi-chi earthquakes are compared. In case of nonlinear analyses, the temperature-dependent behavior of LRBs is modeled in OpenSees only, because of the inability of the other programs mentioned above in capturing the associated strength deterioration. It is revealed that there exists no significant difference between the analysis results of three programs with the exception of the case where the temperature-dependent behavior of LRBs is of concern. It is found that there may be significant differentiation in structural response when the temperature-dependent behavior of LRBs is considered depending on the earthquake level which could have been confirmed by OpenSees program, only.

Index Terms—seismic isolation, modeling of isolation systems, lead rubber bearings, lead core heating.

Cite: Zafer Kanbir, Gökhan Özdemir, and Cenk Alhan, "Modeling of Lead Rubber Bearings via 3D-BASIS, SAP2000, and OpenSees Considering Lead Core Heating Modeling Capabilities," International Journal of Structural and Civil Engineering Research, Vol. 7, No. 4, pp. 294-301, November 2018. doi: 10.18178/ijscer.7.4.294-301
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