Steel hollow sections used in structures such as bridges, buildings and space structures involveuddifferent strengthening techniques according to their structural purpose and shape of the structuraludmember. One such technique is external bonding of CFRP sheets to steel tubes. The performance ofudCFRP strengthening for steel structures has been proven under static loading while limited studiesudhave been conducted on their behaviour under impact loading. In this study, a comprehensiveudnumerical investigation is carried out to evaluate the response of CFRP strengthened steel tubes underuddynamic axial impact loading. Impact force, axial deformation impact velocities are studied. Theudresults of the numerical investigations are validated by experimental results. Based on the developedudfinite element (FE) model several output parameters are discussed. The results show that CFRPudwrapping is an effective strengthening technique to increase the axial dynamic load bearing capacityudby increasing the stiffness of the steel tube.
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