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<p>Ultra-high-performance concrete (UHPC), owing to its high strength, durability, and excellent crack resistance, has been increasingly applied in precast floor slabs and prefabricated structures. However, the structural performance of UHPC slabs during the construction stage remains insufficiently studied. To address this gap, three precast slabs with different clear spans (1200&#xa0;mm, 1800&#xa0;mm, and 2400&#xa0;mm) were designed and fabricated, with consideration of end support lengths. Uniformly distributed load tests were conducted to investigate deformation development, crack propagation, and load-bearing behavior under varying support spacings. Furthermore, a three-dimensional finite element model was established using ABAQUS and validated against the experimental results. Based on the validated model, a parametric analysis was carried out to evaluate the influence of slab thickness, diameters of the upper and lower chord bars, and truss height on the load-bearing capacity and deformation behavior. The results indicate that a support spacing of 2400&#xa0;mm provides both sufficient safety reserves and economic efficiency. Moreover, increasing truss height, upper chord diameter, and UHPC slab thickness significantly improves the load-bearing capacity and flexural stiffness, while the lower chord diameter has only a minor effect.</p>

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Research on the Mechanical Performance of Ultra-High Performance Concrete Reinforced Truss Precast Slabs during the Construction Phase

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Wenzhe Yin,
  • Yafeng Chang,
  • Lin Li,
  • Yuan Gao,
  • Qinbin Hu,
  • Ergang Xiong

摘要

Ultra-high-performance concrete (UHPC), owing to its high strength, durability, and excellent crack resistance, has been increasingly applied in precast floor slabs and prefabricated structures. However, the structural performance of UHPC slabs during the construction stage remains insufficiently studied. To address this gap, three precast slabs with different clear spans (1200 mm, 1800 mm, and 2400 mm) were designed and fabricated, with consideration of end support lengths. Uniformly distributed load tests were conducted to investigate deformation development, crack propagation, and load-bearing behavior under varying support spacings. Furthermore, a three-dimensional finite element model was established using ABAQUS and validated against the experimental results. Based on the validated model, a parametric analysis was carried out to evaluate the influence of slab thickness, diameters of the upper and lower chord bars, and truss height on the load-bearing capacity and deformation behavior. The results indicate that a support spacing of 2400 mm provides both sufficient safety reserves and economic efficiency. Moreover, increasing truss height, upper chord diameter, and UHPC slab thickness significantly improves the load-bearing capacity and flexural stiffness, while the lower chord diameter has only a minor effect.