Abstract
This paper presented a non-linear finite element (FE) analysis to investigate the potential of unbonded carbon fiber-reinforced polymers (CFRP) strengthening in improving the axial compression performance of steel members. The FE model was firstly developed and validated against experimental works. Four parameters considered in the parametric study were the number of CFRP layers, CFRP length, slenderness ratio, and elastic modulus of CFRP. It was confirmed that the unbonded CFRP strengthening method is effective at enhancing the load-carrying capacity as well as delaying the overall buckling of the axial steel members. The strength increase is highly affected by the first three parameters. In addition, the method of an equivalent slenderness ratio can be used for strength design.
Highlights
IntroductionStrengthening steel structures with adhesively bonded (or externally bonded) carbon fiber-reinforced polymers (CFRP) has been considerably developed in recent years
Strengthening steel structures with adhesively bonded carbon fiber-reinforced polymers (CFRP) has been considerably developed in recent years
Steel bars are modeled in finite element and partially strengthened using unbonded CFRP to further investigate the potential of this strengthening method in improving the buckling performance of axial compression steel members
Summary
Strengthening steel structures with adhesively bonded (or externally bonded) carbon fiber-reinforced polymers (CFRP) has been considerably developed in recent years. Even though the performance of steel structures can be much improved, strengthening steel using adhesively bonded CFRP is susceptible to its performance degradation because the bonding strength between CFRP and steel, where this method is highly dependent, can be influenced by many factors. It may lead to the installation process becoming much faster This will allow CFRP to be used for a long time without having to worry about the bond strength degradation of steel and CFRP. Steel bars are modeled in finite element and partially strengthened using unbonded CFRP to further investigate the potential of this strengthening method in improving the buckling performance of axial compression steel members. The applicability of the equivalent slenderness ratio method for determining the allowable compressive stress of the members is presented
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