American Society of Civil Engineers

Repair of Steel Composite Beams with Carbon Fiber-Reinforced Polymer Plates

by Abdullah H. Al-Saidy, (Asst. Prof., Dept. of Civ. and Arch. Engrg., Sultan Qaboos Univ., P.O. Box 33, Al-Khoud 123, Oman), F. W. Klaiber, (Prof., Dept. of Civ. and Constr. Engrg., Iowa State Univ., Ames, IA 50011), and T. J. Wipf, (Prof., Dept. of Civ. and Constr. Engrg., Iowa State Univ., Ames, IA 50011)

Journal of Composites for Construction, Vol. 8, No. 2, March/April 2004, pp. 163-172, (doi:

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Document type: Journal Paper
Abstract: One significant cause of deterioration of steel bridge structures is the corrosion due to extensive use of deicing salts in winter weather. The investigation presented in this paper focused on the behavior of steel composite beams damaged intentionally at their tension flange to simulate corrosion and then repaired with carbon fiber-reinforced polymer (CFRP) plates attached to their tension areas side. Damage to the beams was induced by removing part of the bottom flange, which was varied between no damage and loss of 75% of the bottom flange. All beams were tested to failure to observe their behavior in the elastic, inelastic, and ultimate states. To help implement this strengthening technique, a nonlinear analytical procedure was also developed to predict the behavior of the section/member in the elastic, inelastic, and ultimate states. The test results showed a significant increase in the strength and stiffness of the repaired beams. Through the use of CFRP plates, all damaged beams were fully restored to their original (undamaged state) strength.

ASCE Subject Headings:
Composite beams
Composite materials
Fiber reinforced polymer