SECOND STIFFNESS OF FRP RETROFITTED BRIDGE COLUMNS WITH SHEAR DEFICIENCY
Nowadays, the important infrastructures are required to have not only the high strength and the high ductility but also the usability and the repairability after earthquakes. The main concept of this paper is to check the quick recovery of the original functions of existing RC bridge columns after a moderate to strong earthquake attack by using fiber-reinforced plastic (FRP) jacketing. Based on that, the FRP retrofitted columns should have a clear post yield stiffness. This paper presents an up-to- date literature search pertaining to the performance of retrofitted columns with FRP. The inelastic performance of the retrofitted columns with shear deficiency is scoped out from the literature review. From the envelope curve of the hysteretic response of retrofitted and repaired columns, sixteen columns exhibited that the idealized lateral load- displacement relation has the stable post-yield stiffness. An empirical model is proposed for calculating the second stiffness of the FRP wrapped columns. For columns with shear deficiency, the appropriate design to activate the appearance of the second stiffness is derived from the inclusive data.
Bridge column shear retrofitting FRP recoverability
M. Fahmy Z. Wu
Urban and Civil Engineering Departnent, Ibaraki University, Hitachi, Japan
国际会议
上海
英文
864-872
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）