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2023 | OriginalPaper | Chapter

16. Evaluation of Early-Age Cracking in Arch Feet of PC Girder-CFST Arch Rib Composite Bridge

Authors : Xu Huang, Huaqian Zhong, Shaohua He, Ayman S. Mosallam, Ashraf Abdelkhalek Agwa

Published in: Advances in Smart Materials and Innovative Buildings Construction Systems

Publisher: Springer Nature Switzerland

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Abstract

The prestressed concrete (PC) girder-to-concrete filled steel tubular (CFST) arch composite bridge has increasingly become popular in recently constructed railway bridges. The CFST arch feet connecting the PC girder and CFST arch rib are commonly cracked during bridge construction. This paper performs experimental and numerical studies on CFST arch feet to uncover the reasons behind the early-age cracking of the arch feet’ concrete. Firstly, the prototype bridge was briefly introduced, and a finite element (FE) model using beam element was established to determine internal forces at the arch feet. Then, a solid FE model was established for the arch-to-girder joint structure, and the procedure of hydration heat for the CFST core concrete was simulated and presented. The accuracy of the solid model was calibrated using the experimental results obtained from the arch feet of the actual bridge. Critical factors that cause tensile stress in the concrete abutment are determined based on the results. It shows that concrete hydration heat caused significant temperature differences between the CFST core and abutment concrete, triggering large tensile stress in the concrete arch feet. The maximum tensile stress measured at the abutment surface was 2.3 MPa on average, which was beyond the concrete cracking strength. Furthermore, recommendations for lowering the risk of concrete cracking are suggested. The outcome of this study is supposed to provide a reference for optimizing the early-age cracking performance of CFST arch feet (CFSTAF) in PC girder-to-CFST arch composite bridges.

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Metadata
Title
Evaluation of Early-Age Cracking in Arch Feet of PC Girder-CFST Arch Rib Composite Bridge
Authors
Xu Huang
Huaqian Zhong
Shaohua He
Ayman S. Mosallam
Ashraf Abdelkhalek Agwa
Copyright Year
2023
DOI
https://doi.org/10.1007/978-3-031-47428-6_16