Seismic Performance of Curved Bridges on Soft Soils Retrofitted with Buckling Restrained Braces (original) (raw)
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Seismic retrofitting of bridges based on indirect strategies
IABSE Conference, Rotterdam 2013: Assessment, Upgrading and Refurbishment of Infrastructures, 2013
An indirect retrofitting scheme for bridges is analytically studied and evaluated. The scheme is based on the reduction in seismic actions of the bridge, namely the displacements of the deck and the bending moments of the piers by utilizing external key walls (barrettes) that participate in the earthquake resisting system (ERS) of the bridge as external supports. Simultaneously, the deck of the bridge is made partially continuous by replacing part of the existing sidewalks by new connecting slabs that are fixed on the existing ones. No strengthening of the existing members of the ERS of the bridge was attempted. The new sidewalk slabs respond as RC structural struts connecting the subsequent simply supported spans of the deck, while sliding on the rest of their lengths. The end spans of the deck are connected with the new key walls (barrettes) constructed behind the abutment. During the bridge service, the part of the RC struts, which are supported by the existing sidewalks, i.e. th...
2016
In this study, buckling restrained braces (BRBs) are implemented as a potential retrofit strategy to mitigate damage in skewed bridges. For this purpose, a three-span reinforced concrete (RC) box girder skewed bridge was used as a case study. A three-dimensional (3-D) model was developed in OpenSees to incorporate BRBs between bent columns. The model includes soil-structure interaction effects adjusted by recent results from skewed backfill-abutment interaction experiments. This paper assesses the impacts of five different BRB designs on the performance of skewed concrete box girder bridges with different skewed angles. Nonlinear time history analyses (THAs) were performed to assess effect of BRBs on the seismic performance of skewed bridges. The seismic behavior of skewed bridges can be significantly different from that of straight bridges due to potential torsional effects caused by the combination of longitudinal and transverse seismic responses. Therefore, optimized BRB designs ...