Title: Precast concrete spliced-girder bridge in Washington State using superelastic materials in bridge columns to improve seismic resiliency: From research to practice
Date Published: January-February 2018
Volume: 63
Issue: 1
Page Numbers: 57-71
Authors: Tom Baker, M. Saiid Saiidi, Brian Nakashoji, Jed Bingle, Tim Moore, and Bijan Khaleghi
https://doi.org/10.15554/pcij63.1-02
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Abstract
An innovative bridge design was implemented for the reconstruction of the SR 99 Alaskan Way Viaduct south access connection bridge, a 400 ft (120 m) long, 30.5 ft (9.30 m) wide, three-span, precast, post-tensioned concrete spliced tub girder bridge in Seattle, Wash. The bridge’s superstructure consists of one 180 ft (55 m) long interior span and two 110 ft (34 m) long end spans. The bridge’s superstructure consists of Washington State Department of Transportation standard trapezoidal tub girder section U72PTG6. These precast concrete girder sections were transported to the site in pieces, where they were spliced on temporary supports to produce a three-span, 400 ft long bridge. High-performance/high-strength concrete with design compressive strengths of 7.0 ksi (48 MPa) was specified for the precast concrete segments. The bridge substructure consists of two intermediate piers using shape-memory alloy (SMA) along with engineered cementitious composite (ECC) in plastic-hinge zones of the columns. The focus of this paper is the experimental and analytical studies that were undertaken to evaluate and optimize SMA ECC columns for the bridge and to describe key aspects of the precast concrete spliced bridge design and implementation of SMA and ECC into the bridge.
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