Analytical Parametric Study of a Tied-Back System for Reinforcing Distressed Bridge Abutments Vol I
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1990-12-01
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Edition:Final Report
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Abstract:A bridge abutment is defined as the structure that supports one terminus of the superstructure of a bridge. They are used to transfer the loads from the bridge superstructure to the underlying soil and to provide lateral support to the embankment. Many bridge abutments in South Dakota have experienced significant lateral movements. One of the proposed remedial methods for repairing this distress condition is a tied-back reinforcement system that consists of regularly spaced tie rods with deadman provided at their ends as shown in Figure 1. Anchorage by means of cylindrical drilled-in concrete pile deadman have typically been employed. A computer program, which includes a design method based on the limiting equilibrium approach and an analysis method using the generalized plane strain finite element method for a detailed study of tie-back reinforcement system, was originally developed by the author through a previous South Dakota Department of Transportation research grant no. 3309 {l). The analysis was based on the generalized plane strain approach. It assumed that the out-of-plane strain remains zero rather than the out-of-plane displacement being zero as is commonly used in the conventional plane strain approach.
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