Seismic Performance of Retrofitted Reinforced Concrete Bridge Pier

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Title: Seismic Performance of Retrofitted Reinforced Concrete Bridge Pier

Author(s): Matthew J. Schoettler, Jose I. Restrepo, Frieder Seible, and Ed Matsuda

Publication: Structural Journal

Volume: 102

Issue: 6

Appears on pages(s): 849-859

Keywords: foundation; joint; pile cap

Date: 11/1/2005

Abstract:
The experimental testing of a bridge pier for seismic performance is presented in this paper. A typical bent of Bay Area Rapid Transit’s (BART’s) West Oakland Aerial Guideway was investigated at half scale. Two pseudo-cyclic bidirectional tests were conducted on a single test specimen modeling an existing pier including proposed retrofit measures. Twenty-four battered piles provided the foundation moment capacity during a system test. This test evaluated the likely failure mechanism of the pile-pile cap connection. The second test isolated the column-footing joint by restraining pile cap rotation and translation. In this test, retrofitted pile cap was evaluated for its joint shear response. The system test results indicated a limited system ductility after pile failure, followed by a rocking response of the pier. Results from the joint shear test indicated the retrofit was sufficient to prevent a joint shear failure and helped establish the allowable column-footing joint shear stress to use in retrofit design.