TORSIONAL BEHAVIOR OF R.C T-STRENGHENED AGAINST TORSION WITH CFRP STRIPS AND ANCHORS

Document Type : Original Article

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Civil Engineering Department, Faculty of Engineering, Benha University, Cairo, Egypt.

Abstract

Fiber reinforced polymer (FRP) is a promising and a recent development material for strengthening and rehabilitation of deficient concrete elements. The most recent report by ACI Committee (440.2R-08) suggested that any proposed anchorage system for externally strengthening should be heavily inspected before field application [2]. The conducted researches on torsion shows that the torsional behavior of flanged beams externally strengthened with FRP systems has not been fully investigated. The objective of the present experimental study is to have a better understanding the Torsional Behavior of R.C T-beams strengthened Against Torsion with CFRP Strips and anchors. Seven R.C beams were tested; All the specimens had the same reinforcement, and dimensions. Two specimens were control beams without strengthening, the other beams were strengthened using external CFRP strips. The variables were the strengthening techniques and using anchor or not. The strengthening techniques used were: unanchored extended U-jacket strips, anchored extended U-jacket strips, fully wrapped strips and semi fully wrapped strips with steel or fiber anchors. Externally strengthening the beams with CFRP improved the ultimate strength of all the tested beams. However, the level of strengthened externally is dependent on the selected strengthening method. Using the anchors do improve torsional strength and ductility.
 

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