Innovative Materials For Bridge Seismic Design
Author(s)
M. Saiidi & H. Wang
Abstract
Shape memory alloys (SMAs) are unique alloys that have the ability to undergo
large deformation, but can recover deformations fully after the loads. The
primary objective of this study was to investigate the seismic performance of RC
columns with SMA longitudinal reinforcement in the plastic hinge area. Another
target was to evaluate seismic performance and damage in a repaired SMA-reinforced
column using engineered cementitious composites (ECC). Two
quarter-scale spiral RC columns with SMA longitudinal reinforcement in the
plastic hinge area were designed and constructed for shake table testing at the
Large Scale Structure Laboratory of the University of Nevada, Reno. The shake
table data showed that SMA RC columns were able to recover nearly all of the
post-yield deformation and that the use of ECC reduced the concrete damage
substantially, thus requiring minimal repair even after very large earthquakes.
Keywords: shape memory alloy, seismic performance, deformation, engineered
cementitious composites, plastic hinge.
1 Introduction
Reinforced concrete structures in seismic regions are susceptible to collapse and
severe damage due to excessive lateral displacements. The basis of conventional
seismic design is to yield steel in order to dissipate energy while encountering
permanent deformation due to plastic properties of post-yield steel
reinforcements. Shape memory alloys (SMA) are unique alloys that have the
ability to undergo large deformations, but can return to their undeformed shape
by heating or through removal of the stress. Therefore if SMA can be used as
reinforcement in seismic design, it can yield under strains caused by seismic
loads but potentially recover deformations at the end of earthquakes. The
University of Nevada, Reno (UNR) and others have conducted analytical and
Keywords
shape memory alloy, seismic performance, deformation, engineered
cementitious composites, plastic hinge.
Related Book
Other papers in this volume
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