Superelastic shape memory alloy composite bars for reinforcing concrete structures

reinforced concrete;shape memory alloy;Superelastic Shape Memory Alloys (SMA);Fiber Reinforced Polymer (FRP);ductility;energy dissipation

Wierschem, Nicholas E. ; Andrawes, Bassem ; Andrawes ; Bassem

关键词: reinforced concrete;    shape memory alloy;    Superelastic Shape Memory Alloys (SMA);    Fiber Reinforced Polymer (FRP);    ductility;    energy dissipation;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/14631/1_Wierschem_Nicholas.pdf?sequence=4&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Superelastic shape memory alloys (SMAs) are a class of metallic alloys that have the unique property of being able to undergo large amounts of plastic strain while remaining elastic and dissipating energy. This thesis explored a strategy for adding ductility and energy dissipation to FRP reinforcing bars through the use of SMA-fiber reinforced polymer (SMA-FRP) composites, an innovative type of composite that consists of a polymer matrix reinforced with small diameter superelastic SMA wires with and without additional conventional fiber reinforcement. In this study an analytical model for the behavior of SMA-FRPs was developed based on experimental results. This model was then used in a parametric study to determine the effect of the composition of the composite on its performance. After which, the SMA-FRP bars were explored as reinforcement for concrete structures with analyses at the section, substructure, and structural levels. From this study it was found that SMA-FRP reinforcing bars behave in a ductile manner and are capable of dissipating energy. Furthermore, it was found that SMA-FRP bars have more potential to improve the ductility and energy dissipation capability of concrete structures compared to conventional FRP bars.