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Experimental Study on Flexural Behaviour of Prestressed Specified Density Concrete Composite Beams

Author

Listed:
  • Xingyu Song

    (College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225000, China)

  • Yan Liu

    (College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225000, China)

  • Xiaodong Fu

    (International Century Design of Architecture, Changzhou 213000, China)

  • Hongwei Ma

    (College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225000, China)

  • Xiaolun Hu

    (School of Transportation, Southeast University, Nanjing 211189, China)

Abstract

To solve the problem of poor seismic resistance due to the disadvantages of traditional concrete composite beams, such as heavy self-weight in prefabricated buildings, prestressed specified-density concrete composite beams are proposed herein. First, a mix ratio test of specified-density concrete was performed. Second, five prestressed specified-density composite beams, a prestressed ordinary concrete composite beam, and a prestressed semi lightweight concrete cast-in-situ beam were tested. The influence of the precast concrete height, reinforcement ratio, and concrete materials on the failure mechanism, flexural bearing capacity, and short-term stiffness of the composite beams were analysed. From the results, the specified-density concrete composite beams and the ordinary composite beam had similar ultimate bearing capacities, but the average distance between crack spacings of the former was smaller. The precast concrete height affected the bending performance of the prestressed specified density concrete composite beam insignificantly, but the maximum ultimate bearing capacity of the composite beam could be increased by 35.6% by increasing the reinforcement ratio. The composite beam and the cast-in-place beam exhibited similar load-carrying capabilities and deformation properties. The average crack spacing, cracking load, and ultimate load value of the specified density concrete composite beams calculated according to the China national standard “Code for design of concrete structures” were consistent with the measured values.

Suggested Citation

  • Xingyu Song & Yan Liu & Xiaodong Fu & Hongwei Ma & Xiaolun Hu, 2022. "Experimental Study on Flexural Behaviour of Prestressed Specified Density Concrete Composite Beams," Sustainability, MDPI, vol. 14(22), pages 1-14, November.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:22:p:14727-:d:966945
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    References listed on IDEAS

    as
    1. How-Ji Chen & Kuo-Cheng Wu & Chao-Wei Tang & Chung-Ho Huang, 2018. "Engineering Properties of Self-Consolidating Lightweight Aggregate Concrete and Its Application in Prestressed Concrete Members," Sustainability, MDPI, vol. 10(1), pages 1-13, January.
    2. Jian Meng & Ziling Xu & Zeli Liu & Song Chen & Chen Wang & Ben Zhao & An Zhou, 2022. "Experimental Study on the Mechanics and Impact Resistance of Multiphase Lightweight Aggregate Concrete," Sustainability, MDPI, vol. 14(15), pages 1-15, August.
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