Description
Previous research has demonstrated the potential of improving glass beams' performance through prestressed bonded iron-based shape memory alloys (Fe-SMAs). The bonded Fe-SMAs significantly enhance both the initial glass cracking load and the residual load-bearing capacity of glass beams, compared with unstrengthened ones. Ductile failure modes can be achieved after being reinforced with Fe-SMA, compared with unreinforced counterparts exhibiting brittle failure modes. Achieving the desired prestress level in Fe-SMAs involves controlled heating and natural cooling of Fe-SMAs. The achieved prestress level of Fe-SMAs depends on the activation strategies, which include activation position, length, and temperature. An appropriate activation strategy is essential to achieve a high prestress level and prevent premature failures, such as glass breakage or debonding during activation. This work investigates two strategies: one-time activation and segmented activation, aiming to attain high prestress levels while avoiding glass breakage and debonding. The study compares these activation strategies by analyzing their influence on temperature transition and stress distribution. The findings in this research will contribute to the effective design of strengthening glass elements using adhesively bonded Fe-SMA, achieving high prestress levels and minimizing stress concentration.
