Advances in concrete construction

  • 제5권5호
  • /
  • Pages.469-479
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  • 2017
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  • 2287-5301(pISSN)
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  • 2287-531X(eISSN)
테크노프레스 (Techno-Press)
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Shear-lag behavior of prestressed concrete box-girder bridges during balanced cantilever construction

  • Zhong, Xingu (School of Civil Engineering, Hunan University of Science and Technology: Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control) ;
  • Zhang, Tianyu (School of Civil Engineering, Hunan University of Science and Technology: Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control) ;
  • Shu, Xiaojuan (School of Civil Engineering, Hunan University of Science and Technology: Hunan Provincial Key Laboratory of Structural Engineering for Wind Resistant and Vibration Control) ;
  • Xu, Hongliang (China CEC Engineering, Corporation)
  • 투고 : 2016.12.21
  • 심사 : 2017.09.12
  • 발행 : 2017.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

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.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

참고문헌

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피인용 문헌

  1. A New Approach for Free Vibration Analysis of Thin-Walled Box Girder Considering Shear Lag Effect vol.2019, pp.None, 2017, https://doi.org/10.1155/2019/3902828