ANALYTICAL MODEL AND EXPERIMENTAL VALIDATION OF FRP CONFINED BRIDGE COLUMNS with RC RECTANGULAR HOLLOW CROSS SECTIONS

In order to evaluate aseismic performance of Fiber Reinforced Polymer (FRP) confined reinforced concrete (RC) rectangular hollow-bridge columns, a simplified confined concrete model of FRP is proposed by considering the effective strength coefficient and area distribution ratio of FRP hoops. The proposed simplified analytical model is validated to be right and effective by comparing the test results and calculation results of lateral forces vs deformations at the top of bridge piers and rotation deformations vs moments at the bottom section of bridge column specimens. Based on the improved analytical model presented, aseismic performance parameters of flexural capacity, curvature, the plastic rotation capacity of cross sections of a RC rectangular hollow section pier restrained by different types of FRP are investigated. The results show that the loop packaged FRP cloth has a more considerable effect on ductility than the load capacity of FRP restricted RC rectangular hollow-bridge columns.