Strengthening of deficient steel sections using CFRP composite under combined loading

Document Type: Research Paper


Department of Civil Engineering, Zahedan Branch, Islamic Azad University, Zahedan, Iran



These days, strengthening of steel sections using carbon fiber reinforced polymer (CFRP) has attracted the attention of many researchers. For various reasons, the structures may be placed under combined loads. The deficiency in steel members may be created due to the errors caused by construction, fatigue cracking, and others. This study investigates the behaviors of deficient square hollow section (SHS) steel members strengthened by CFRP sheets under two types of the combined loads. To study the effect of CFRP strengthening on the structural behaviors of the deficient steel members, 17 specimens, 12 of which were strengthened using CFRP sheets, were analyzed. To analyze the steel members, 3D (three dimensional) modeling and nonlinear static analysis methods were applied, using ANSYS software. The results showed that CFRP strengthening has an impact on raising the ultimate capacity of deficient steel members and can recover the strength lost due to deficiency, and the impact CFRP strengthening on rising and recovering the ultimate capacity of the steel members under loading scenario 2 was more than the steel members under scenario 1.