in shear strength are given in Table 7. The shear forces were predicted at shear stress equal to 60% of yield strength over the cross-section. The average measured percentage increases of the strengthened specimens are also provided in the table. It is worth noting that the proposed analytical approach is not considering the effects of the CFRP strands orientation. The comparisons shown indicate that the shear load can be conservatively estimated using transformed section properties of the strengthened plate. For the design, the above analysis indicates that the shear capacity can be adequately predicted by using the composite transformed section properties of the strengthened steel plates. Table 7: Comparison between measured and predicted Shear capacities Analytical Approach Measured Increase (%) Plate Designation Shear Yielding Increase Set#1 Set#2 Set#3 (%) kN kip (45ο) (90ο) (±45ο) Control 781 176 - - 1 Layer HM Strengthened 978 220 25 36 23 24 2 Layer HM Strengthened 1175 264 51 65 67 79 Summary & Conclusion The study presented in this paper explores the use of small-diameter CFRP strands for strengthening of steel plates subjected to pure shear stresses. In general, test results show that the small-diameter CFRP strands provided an excellent strengthening system for steel structures and eliminated any possible debonding of the strengthening material up to failure. Several conclusions were made from the measured behavior in the specimens tested in the experimental program. The conclusions are summarized as follows, The small-diameter CFRP strands have proven to be an effective strengthening system for increasing the shear capacity of the steel plates. The proposed strengthening system exhibits excellent bond characteristics in compression and in tension and eliminated any possible debonding at failure. The effectiveness of the small-diameter CFRP strengthening system increased by increasing the slenderness ratio of the plates subjected to shear loads. High-Modulus (HM) small-diameter CFRP strands provides a more effective strengthening system in comparison to Intermediate-Modulus (IM) and Low-Modulus (LM) CFRP strands for shear strengthening of steel plates.
in shear strength are given in Table 7. The shear forces were predicted at shear stress equal to 60% of yield strength over the cross-section. The average measured percentage increases of the strengthened specimens are also provided in the table. It is worth noting that the proposed analytical approach is not considering the effects of the CFRP strands orientation. The comparisons shown indicate that the shear load can be conservatively estimated using transformed section properties of the strengthened plate. For the design, the above analysis indicates that the shear capacity can be adequately predicted by using the composite transformed section properties of the strengthened steel plates. Table 7: Comparison between measured and predicted Shear capacities Plate Designation Analytical Approach Measured Increase (%) Shear Yielding Increase (%) Set#1 (45ο) Set#2 (90ο) Set#3 (±45ο) kN kip Control 781 176 - - 1 Layer HM Strengthened 978 220 25 36 23 24 2 Layer HM Strengthened 1175 264 51 65 67 79 Summary & Conclusion The study presented in this paper explores the use of small-diameter CFRP strands for strengthening of steel plates subjected to pure shear stresses. In general, test results show that the small-diameter CFRP strands provided an excellent strengthening system for steel structures and eliminated any possible debonding of the strengthening material up to failure. Several conclusions were made from the measured behavior in the specimens tested in the experimental program. The conclusions are summarized as follows, The small-diameter CFRP strands have proven to be an effective strengthening system for increasing the shear capacity of the steel plates. The proposed strengthening system exhibits excellent bond characteristics in compression and in tension and eliminated any possible debonding at failure. The effectiveness of the small-diameter CFRP strengthening system increased by increasing the slenderness ratio of the plates subjected to shear loads. High-Modulus (HM) small-diameter CFRP strands provides a more effective strengthening system in comparison to Intermediate-Modulus (IM) and Low-Modulus (LM) CFRP strands for shear strengthening of steel plates.