Investigation and Control of Cracks in Wet Joint of Concrete Box Girders

Zhu, Haibo; Zhao, Yang; Luo, Xue; Xu, Rongqiao

doi:10.1061/(asce)cf.1943-5509.0001656

Cited by 2 publications

(2 citation statements)

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Section: Introductionmentioning

confidence: 99%

“…17 Meanwhile, there is also a lack of quantitative analysis on the thermal stress caused by the cast temperature field, and the research on the correlation between the thermal stress field, thermomechanical behavior, and the risk of thermal cracks. [18][19][20] Based on a three-span prestressed continuous rigid frame bridge under the construction, the cast temperature field and the related thermal stress field of the zero block with the biggest cast volume among the segments of box girder are measured using the embedded instruments in this study. Combining with the FEM simulations using large-scale commercial software ANSYS, the common features of the high-strength concrete box girder in the process of hydration heat are obtained.…”

Section: Introductionmentioning

confidence: 99%

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Measurements and numerical simulations for cast temperature field and early-age thermal stress in zero blocks of high-strength concrete box girders

Zhang

Xiong

Wang

2022

Advances in Mechanical Engineering

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The measurements and simulations using finite element software are carried out on the cast temperature field as well as the related thermal stress field in zero blocks of segmental high-strength concrete box girder. The thermodynamic parameters, to some extent dominating the effectiveness of the simulation, are determined carefully in terms of the statistical data, the empirical formulas as well as the measured data in an actual project, which leads to reliable simulation results by means of the finite element software. The comparison between the calculated and measured values of temperature field shows that the maximum error among all measuring points is only 1.71%. Meanwhile, the predicted directions of principal tensile stress coincide with the actual directions of the observed cracks well. Based on the above work, the common features of the cast temperature field caused by heat of hydration are obtained for this kind of structures. The relationships of the cast temperature field, the thermal stress, and the early-age cracks are discussed quantitatively in order to provide reasonable suggestions for temperature control and crack prevention in similar projects.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%