STUDY ON PREYIELD SHEAR STIFFNESS OF DIFFERENTIAL RESTORING FORCE MODEL FOR LEAD RUBBER BEARING
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 d K to 40 d K 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 d K to 40 d K , meanwhile the stiffness of the superstructure is 100 d K ,300 d K , 500 d K 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.
lead rubber bearing differential restoring force model preyield shear stiffness compression-shear test
J.J. JIN F.L.Zhou P,Tan X.Y. Huang X.Z. Zhuang C.Y. Shen
School of Civil Engineering , Xian University of Architecture and Technology,Xian ,China;Earthquak Earthquake Engineering Research& Test Center ,Guangzhou University ,Guangzhou ,China
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）