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Abstract

Horizontal cracking at the foundation level is uncommon in gravity U-type abutments. This paper investigates the causes and reinforcement measures for unconventional horizontal cracks in the foundation and vertical cracks in the abutment wall of a gravity U-type abutment on a highway bridge. Survey and analysis results show that the vertical cracks in the abutment wall are structural cracks caused by excessive reaction forces from permanent loads combined with the impact loads from vehicles at expansion joints. The horizontal foundation cracks result from the presence of filler interlayers at the foundation, which softened over time due to water exposure, leading to foundation voiding or poor contact. The long-term impact of vehicle loads caused delamination failure. To address the causes of these cracks, reinforcement measures such as steel pipe grouting to fill voids and strengthen the foundation, concrete section enlargement to enhance structural capacity, and the addition of auxiliary supports to distribute loads and reduce stress concentrations are proposed.

Publication Date

5-11-2023

DOI

10.14048/j.issn.1671-2579.2023.02.025

First Page

140

Last Page

143

Submission Date

March 2025

Reference

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