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Abstract

The continuous rigid frame box girders have complex shapes. If not properly maintained at an early stage, they are prone to cracking. By taking the actual occurrence of diagonal cracks in the web of a cast-in-place box girder in a certain project as an example, this paper measured the mechanical, thermal, and deformation performance of concrete. Based on the concrete maturity theory, three-dimensional simulation analysis technology was adopted to study the causes of cracks. The results indicate that the main cause of concrete cracking is low ambient temperature. After demoulding, the concrete temperature rapidly drops to ambient temperature, leading to the formation of large tensile stress inside the concrete. The reason for cracking along the position of the corrugated pipe is that the concrete section at that location decreases, making it prone to stress concentration. Possible cracking prevention measures include maintaining ventilation as much as possible before demoulding, controlling the highest concrete temperature, and applying covers and steam maintenance technique after demoulding to avoid direct exposure of concrete to cold air and prolong the cooling time of concrete. After adopting the optimized maintenance measures by simulation calculations, the measured temperature history and stress history show consistent trends with the calculated results, and the solid structure doesn't crack again.

Publication Date

11-8-2022

DOI

10.14048/j.issn.1671-2579.2022.05.023

First Page

124

Last Page

131

Submission Date

April 2025

Reference

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