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Advances in Concrete Construction Volume 5, Number 5, October 2017 , pages 469-479 DOI: https://doi.org/10.12989/acc.2017.5.5.469 |
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Shear-lag behavior of prestressed concrete box-girder bridges during balanced cantilever construction |
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Xingu Zhong, Tianyu Zhang, Xiaojuan Shu and Hongliang Xu
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| Abstract | ||
| Balanced cantilever construction is extensively used in the construction of prestressed concrete (PSC) box-girder bridges. Shear-lag effect is usually considered in finished bridges, while the cumulative shear-lag effect in bridges during balanced cantilever construction is considered only rarely. In this paper, based on the balanced cantilever construction sequences of large-span PSC box-girder bridges, the difference method is employed to analyze the cumulative shear-lag effect of box girders with varying depth under the concrete segments\' own weight. During cantilever construction, no negative shear-lag effect is generated, and the cumulative shear-lag effect under the balanced construction procedure is greater than the instantaneous shear-lag effect in which the full dead weight is applied to the entire cantilever. Three cross-sections of Jianjiang Bridge were chosen for the experimental observation of shear-lag effect, and the experimental results are in keeping with the theoretical results of cumulative shear-lag effect. The research indicates that only calculating the instantaneous shear-lag effect is not sufficiently safe for practical engineering purposes. | ||
| Key Words | ||
| box-girder bridges; balanced cantilever construction; shear-lag effect; the cumulative effect; prestress | ||
| Address | ||
| Xingu Zhong, Tianyu Zhang and Xiaojuan Shu: School of Civil Engineering, Hunan University of Science and Technology; Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control, Xiangtan, 411201, China Hongliang Xu: China CEC Engineering, Corporation, Changsha, China | ||
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