Abstract
Adhesively attaching iron-based shape memory alloy (Fe-SMA) to repair cracks in existing buildings represents a novel and effective approach to extending their service lives. The bond behavior between Fe-SMA and these parent buildings is crucial for the safety of reinforcement systems. Under hot-humid environments, the bond capacity of these reinforcement systems deteriorates, making the durability and reinforcement efficiency questionable. This study evaluates the distribution and progressive propagation of Fe-SMA strain and interface shear stress within the lap zone, as well as the failure behavior of Fe-SMA/steel single strap joints (SSJs) exposed to 55 °C running water. Based on experimental results, the bond-slip models of SSJs with various adhesive types and aging durations immersed in running water are proposed. As the aging duration extends, the maximum Fe-SMA strain and interface shear stress of SSJs decrease. The maximum shear stress of Type-AI SSJs at aging durations of 30, 60, and 90 days are 14.69, 11.89, and 9.66MPa, respectively. Similarly, for Type-AII, the maximum shear stress at the same aging durations are 15.09, 11.26, and 8.82MPa, respectively. When the aging duration increases from 30 to 90 days, the effective lap length of Type-AI and Type-AII SSJs improves by 13.33% and 18.75%, respectively. The maximum errors for cubic and bilinear bond-slip models in estimating fracture energy under harsh environments are 12% and 16%, respectively. After 90 days of exposure to running water, the fracture energy of Type-AI and Type-AII SSJs reduces by approximately 83% and 88%, respectively. This research offers guidelines for the durability of existing buildings strengthened with bonded Fe-SMA, reducing maintenance costs.
Published Version
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