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Abstract

In order to determine the effect of hydration heat of the post-cast section of cast-in-place prestressed concrete box girder on its own section and adjacent poured section during the construction process, the mechanical properties, temperature field of hydration heat, and strain field of early-age concrete N13 section of the southern span concrete box girder were measured on site against the background of Wuxue Yangtze River Bridge. The finite element models of the N13 section and its adjacent poured sections were established to analyze the development law of hydration heat temperature field and stress field between adjacent sections of the concrete box girder. The results show that under the action of hydration heat at the early age of the post-cast section, the concrete of the post-cast section cannot move freely and thus produce compressive stress due to the transverse bridge constraint effect of adjacent sections. The temperature-induced tensile stress in the inner web and roof of the adjacent poured sections at about 1.0 m away from the joint surface is relatively large, with the maximum tensile stress being 3.93 MPa and 4.54 MPa, respectively, which exceeds the tensile strength of the concrete sections at the corresponding time and may lead to the cracking of the box girder. The effective measures to prevent concrete cracking are to reduce the temperature rise of hydration heat and stretch the horizontal and vertical prestress in the adjacent sections before pouring of post-cast section.

Publication Date

11-24-2023

DOI

10.14048/j.issn.1671-2579.2023.05.017

First Page

96

Last Page

103

Submission Date

March 2025

Reference

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