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Abstract

Large-sized prestressed reinforced concrete box girder makes it easy to produce floor cracks due to construction temperature. In view of the floor cracks of a short tower cable-stayed wide box girder in Nanchong, Sichuan Province at the beginning of construction, a mixed element calculation model was established to simulate the stress calculation of the effects of temperature difference of hydration heat, sunshine temperature difference, overall cooling, and their combination factors on the floor of 7# section box girder. The stresses in some areas of the floor under the combined conditions of Ⅰ, Ⅳ, and Ⅴ reached 2.0, 4.0, and 4.9 MPa, respectively, which were greater than the allowable value of crack resistance and were consistent with the actual crack situation. Combined with the stress analysis, the subsequent box girder construction adopted the double mixing technology to reduce the hydration heat, extend the final setting time to 16 h, lower the concrete mold temperature, and improve “inner drop and outer protection” maintenance and other measures, so as to effectively control the floor cracks.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.0024

First Page

131

Last Page

135

Submission Date

May 2025

Reference

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