Effects of Longitudinal Reinforcement Ratio on Flexural Capacity of One-Way Slab of UHPC Waffle Bridge Deck

ZHANG Rui; ZHAO Ran; LIU Zhenlun; HU Peng; CHEN Kedao; LI Xi

doi:10.3969/j.issn.0258-2724.20210923

Volume 58 Issue 6

Dec. 2023

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Journal of Southwest Jiaotong University > 2023 > 58(6): 1432-1439.

ZHANG Rui, ZHAO Ran, LIU Zhenlun, HU Peng, CHEN Kedao, LI Xi. Effects of Longitudinal Reinforcement Ratio on Flexural Capacity of One-Way Slab of UHPC Waffle Bridge Deck[J]. Journal of Southwest Jiaotong University, 2023, 58(6): 1432-1439. doi: 10.3969/j.issn.0258-2724.20210923

Citation:

ZHANG Rui, ZHAO Ran, LIU Zhenlun, HU Peng, CHEN Kedao, LI Xi. Effects of Longitudinal Reinforcement Ratio on Flexural Capacity of One-Way Slab of UHPC Waffle Bridge Deck[J]. Journal of Southwest Jiaotong University, 2023, 58(6): 1432-1439. doi: 10.3969/j.issn.0258-2724.20210923

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Effects of Longitudinal Reinforcement Ratio on Flexural Capacity of One-Way Slab of UHPC Waffle Bridge Deck

doi: 10.3969/j.issn.0258-2724.20210923

1.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China
2.
School of Civil Engineering, Qingdao University of Technology, Qingdao 266525, China

Received Date: 15 Nov 2021
Rev Recd Date: 02 Mar 2022

Available Online: 28 Jun 2023

Publish Date: 24 Mar 2022

Abstract

Abstract

To study the effect of longitudinal reinforcement ratio on the flexural capacity of a one-way slab of an ultra-high performance concrete (UHPC) wafer bridge deck, six full-scale T-beam models with varying longitudinal reinforcement ratios were produced by using the principle of equivalent width to simplify the analysis. Firstly, the basic mechanical properties of UHPC were studied, followed by the flexural behavior and failure mode of T-shaped UHPC beams through loading experiments. Secondly, a constitutive model for the tensile and compressive strength of UHPC was proposed based on the results of material performance tests. Through section analysis, a formula for calculating the ultimate flexural capacity of T-shaped UHPC beams was derived. Finally, the applicability of the proposed formula was validated based on previous research results. The research findings indicate that although reducing the longitudinal reinforcement ratio will weaken the ultimate flexural capacity and ductility of T-shaped UHPC beams, the failure mode of the components will not change, and T-shaped UHPC beams will still exhibit ductile failure characteristics, even with low or no reinforcement, due to the excellent tensile strength and toughness of UHPC. Moreover, the results of section analysis derivation indicate that the coefficient of variation of the ultimate tensile strength of UHPC under tension is proportional to the longitudinal reinforcement ratio. Therefore, increasing the longitudinal reinforcement ratio can significantly enhance the tensile strength of UHPC. The proposed formula was found to be applicable.
- bridge engineering,
- T-shaped beam,
- ultra-high performance concrete (UHPC),
- flexure test,
- longitudinal reinforcement ratio,
- section analysis

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References

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