Study on Preyield Shear Stiffness of Differential Restoring Force Model for Lead Rubber Bearing

Abstract eng:
This paper introduces development of differential restoring model (Bouc-Wen model) for lead rubber bearing and its application in seismic-isolation design. At present, SAP2000 and ETABS are used very widely in seismic isolation design. When the preyield shear stiffness of the Bouc-Wen model for LRB is varied, the corresponding hysteretic loop is different. The value and range of the preyield shear stiffness of the Bouc-Wen model for LRB are defined quite different according to seismic isolation codes of different countries. which may result in significant computational errors. Compression-shear tests of two different LRBs are conducted in this paper. The predicted differential restoring force model with various preyield shear stiffness ranging from 5 K d to 40 K d is considered and compared with the experimental results. Some important conclusions can be drawn from the results. An eight-story isolated building is used as the numerical example, in which the preyield shear stiffness of the LRB is chosen10 K d to 40 K d , meanwhile the stiffness of the superstructure is 100 K d , 300 K d , 500 K d for each shear stiffness of the LRB. Thus the effect of different initial shear stiffness on the structure with various natural periods can be considered and compared. Finally, a reasonable value and range of the preyield shear stiffness of the lead rubber bearing is given in design of the isolated building using commercial program such as SAP2000 or ETABS are given in this paper.

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