Tests on Cracked Steel Plates with Different Damage Levels Strengthened by CFRP Laminates
Author(s): |
Qian-Qian Yu
Xiao-Ling Zhao Riadh Al-Mahaidi Zhi-Gang Xiao Tao Chen Xiang-Lin Gu |
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Medium: | journal article |
Language(s): | English |
Published in: | International Journal of Structural Stability and Dynamics, June 2014, n. 6, v. 14 |
Page(s): | 1450018 |
DOI: | 10.1142/s0219455414500187 |
Abstract: |
Strengthening steel structures using carbon fiber reinforced polymer (CFRP) materials has attracted much attention in recent years owing to their potential for fatigue crack repair and their convenience in construction. However, little is known about the efficiency of this strengthening method when applied to steel plates at different crack propagation stages. An experimental study was carried out on notched steel plates strengthened using CFRP laminates. 20 specimens were tested to evaluate the fatigue performance of the strengthened steel plates with emphasis on various degrees of initial damage, simulated by different lengths of slots, including 2%, 10%, 20%, 30% and 40% of the plate width. The effects of the retrofitted configuration and CFRP stiffness were also investigated. The "beach marking" technique and crack propagation gauges were adopted to monitor the fatigue crack propagation. The experimental results were very encouraging, demonstrating that the CFRP patches could effectively slow crack growth and extend fatigue life, regardless of the initial damage levels. More effective strengthening was found by using ultra-high modulus CFRP laminates, covering the initial cracks with CFRP and repairing at an earlier stage (i.e. smaller damage level). |
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10352722 - Published on:
14/08/2019 - Last updated on:
14/08/2019