Application of Shape Memory Alloys in the Seismic Retrofitting of Bridge Columns

Abstract eng:
This analytical study focuses on investigating a new active confinement retrofitting technique for reinforced concrete bridge columns using pre-strained shape memory alloy (SMA) hoops. The shape memory feature of SMAs is sought in this study to apply large lateral confining pressure on the columns in an easy and reliable technique. A finite element model is developed for a column adopted from the literature and retrofitted with SMA hoops and CFRP wraps. The compression stress-strain behaviors of passively and actively confined concrete using CFRP wraps and SMA hoops, respectively are implemented in the finite element model. The retrofitted column behavior is studied under displacement-controlled and seismic excitations. The results of the cyclic loading analysis indicates an increase in the SMA retrofitted column strength by approximately 34% compared to that of the CFRP retrofitted column. The seismic analysis results show that the early increase in the concrete strength associated with using SMA hoops results in a maximum and residual drift reduction of approximately 12% and 50%, respectively compared to the drifts obtained by using conventional CFRP wraps.

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