Behavior of CFRP strengthened RC multicell box girders under torsion

Abeer A. Majeed, Abbas A. Allawi, Kian H. Chai and Hameedon W. Wan Badaruzzam

Abstract

The use of fiber reinforced polymer (FRP) for torsional strengthening of reinforced concrete (RC) single cell box beams has been analyzed considerably by researchers worldwide. However, little attention has been paid to torsional strengthening of multicell box girders in terms of both experimental and numerical research. This paper reports the experimental work in an overall investigation for torsional strengthening of multicell box section RC girders with externally-bonded Carbon Fiber Reinforced Polymer CFRP strips. Numerical work was carried out using non-linear finite element modeling (FEM). Good agreement in terms of torque-twist behavior, steel and CFRP reinforcement responses, and crack patterns was achieved. The unique failure modes of all the specimens were modeled correctly as well.

Key Words

concrete torsion; multicell box girder; carbon fiber reinforced polymer; strengthened girders; finite elements; nonlinear analysis

Address

Abeer A. Majeed : Engineering Affairs Department, University of Baghdad, 17001 Baghdad, Iraq Abbas A. Allawi : Department of Civil Engineering, University of Baghdad, 17001Baghdad, Iraq Kian H. Chai : Department of Civil Engineering, Faculty of Engineering Building, University of Malaya, 50603 Kuala Lumpur, Malaysia Hameedon W. Wan Badaruzzam : Department of Civil and Structural Engineering, Faculty of Engineering, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

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