Title: Seismic Fragility Assessment of Bridge Pier Reinforced by High-Performance Fiber-Reinforced Concrete and Shape Memory Alloys
Author(s): Amirmozafar Benshams, Farzad Hatami, and Mesbah Saybani
Publication: Materials Journal
Appears on pages(s): 49-61
Keywords: Cu-Al-Mn; fragility curve; high-performance fiber-reinforced concrete (HPFRC); NiTi; shape memory alloy (SMA)
Shape memory alloys (SMAs), with their unique ability to undergo large deformations and recover to their initial shapes through the removal of stress without significant residual strain, have become attractive materials in bridge engineering. In this study, nine samples of bridge piers are reinforced by two types of SMA (NiTi and Cu-Al-Mn) in plastic hinge regions where high-performance fiber-reinforced concrete (HPFRC) is additionally used to enhance the ductility of piers. To investigate the effects of SMAs and HPFRC on seismic performance of concrete bridge piers, 28 near-field ground-motion record pairs are selected. Then, the models are analyzed using the incremental dynamic analysis (IDA) method and fragility curves are derived. The results show that using SMAs leads to the reduction of residual drift. Also, using HPFRC increases the capacity of the models. Furthermore, the model with HPFRC and NiTi shows the best performance in terms of capacity and residual drift reduction.