Abstract
This paper presents the experimental and numerical analysis of damaged steel beams strengthened with prestressed CFRP sheet or only strengthened with CFRP sheet. The test results showed that damaged level had a significant effect on the stiffness, yield load, and ultimate bearing capacity. And using prestressing CFRP sheet to strengthen damaged steel beam could increase the ultimate bearing capacity. The numerical analysis results showed that the damaged level had a significant effect on the stiffness and ultimate bearing capacity. The strengthened steel beam with the damaged level could exceed the steel beam without damage by about 10% in the ultimate bearing capacity. The ultimate bearing capacity would increase about 8% when the flange or web thickness increased per 1 mm. The ultimate bearing capacity would increase about 3% when the thickness or width of CFRP sheet increased per 0.05 mm or 10 mm. The bearing capacity would increase about 1.5% when the prestressed degree increased about 7%.
Highlights
Steel structure may be damaged by the erosion of natural environment, natural disasters, improper operation, loading, and human factors when the structure had been serviced over a long period of time [1]
Ghafoori and Motavalli [9] conducted experimental and numerical studies on lateral-torsional buckling (LTB) of steel beams strengthened by CFRP laminates with normal modulus (NM)
Failure Mode. e steel beams repaired with adhesively bonded prestressed CFRP sheet or CFRP sheet could display four distinct failure modes including the top flange buckling; some part of CFRP sheet debonding; CFRP sheet ruptured with the top flange buckling; CFRP sheet rupture
Summary
Steel structure may be damaged by the erosion of natural environment, natural disasters, improper operation, loading, and human factors when the structure had been serviced over a long period of time [1]. E results showed that CFRP materials bonded around the tip area prolonged the fatigue life of the damaged steel elements about 3 times. Ghafoori and Motavalli [9] conducted experimental and numerical studies on lateral-torsional buckling (LTB) of steel beams strengthened by CFRP laminates with normal modulus (NM) It showed that increasing the prestress in CFRP laminates did not always increase the buckling strength of the reinforced slender steel beams. Yousefi et al [15] presented the experimental and numerical results of failure analysis and structural behavior of notched steel I-beams reinforced by bonded CFRP plates under static load. E performed parametric study had implied that using FRP composites with higher elastic modulus or application of thicker FRP reinforcement results in an increased prestress release/lap-shear capacity of the FRP-to-steel bonded joints, provided that there was enough bond length. Because the test cannot consider all the parameters, finite element softwareABAQUS was used to analyze the variation of load, deflection, and stress along the length of steel beam under different parameters
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