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The performance of the Steel-UHPC composite decks was negatively impacted by shrinkage, which led to cracking in the UHPC layer and induced secondary stresses in the steel plate. This deterioration compromises the durability and safety of structures. This issue remains unresolved because of limited experimental research data, posing challenges when considering shrinkage effects in the design of composite bridge decks cured at room temperature and humidity. To address these challenges, an experimental investigation and numerical simulation were conducted on a full-scale steel-UHPC composite deck specimen to study the development and distribution of shrinkage effects under the actual construction conditions of steel-UHPC composite bridge decks. This study focuses on determining the shrinkage behavior of UHPC with a comparatively low fiber content for economical UHPC. The investigation was conducted under real-world construction conditions, including a shrinkage monitoring test in composite bridge decks cured under normal environmental conditions. Similarly, Finite Element (FE) analyses were carried out to simulate the shrinkage behavior of the specimens, incorporating a model with a temperature-dependent UHPC modulus and a damaged plasticity constitutive model. The experimental results revealed that the strain in the UHPC and steel decks increased rapidly in the first 10–12 days before stabilizing. Based on the experimental results, the initial setting time of UHPC after casting was observed to be 20–30 h after casting under normal temperature and humidity conditions. Furthermore, the distribution of shrinkage-induced strain in UHPC was found to be more pronounced near the edges and less significant in the middle, whereas the steel plate experienced more prominent effects at the center. The simulation results were consistent with the experimental trends, with explainable errors. Additionally, simulations indicated that the shrinkage effects worsened closer to the center of the specimen. Overall, the research outcomes provide valuable information for addressing shrinkage-induced strain-related issues in Steel-UHPC composite decks with low fiber content.

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Experimental and Numerical Study of Shrinkage Behavior in Economical UHPC for Naturally Cured Orthotropic Steel-UHPC Composite Decks

  • 会议论文

  • 发表日期：

    2025年

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  • Sheraz Abbas,
  • Xu Chen,
  • Qinghua Xiao,
  • Muhammad Fahad Ullah

摘要

The performance of the Steel-UHPC composite decks was negatively impacted by shrinkage, which led to cracking in the UHPC layer and induced secondary stresses in the steel plate. This deterioration compromises the durability and safety of structures. This issue remains unresolved because of limited experimental research data, posing challenges when considering shrinkage effects in the design of composite bridge decks cured at room temperature and humidity. To address these challenges, an experimental investigation and numerical simulation were conducted on a full-scale steel-UHPC composite deck specimen to study the development and distribution of shrinkage effects under the actual construction conditions of steel-UHPC composite bridge decks. This study focuses on determining the shrinkage behavior of UHPC with a comparatively low fiber content for economical UHPC. The investigation was conducted under real-world construction conditions, including a shrinkage monitoring test in composite bridge decks cured under normal environmental conditions. Similarly, Finite Element (FE) analyses were carried out to simulate the shrinkage behavior of the specimens, incorporating a model with a temperature-dependent UHPC modulus and a damaged plasticity constitutive model. The experimental results revealed that the strain in the UHPC and steel decks increased rapidly in the first 10–12 days before stabilizing. Based on the experimental results, the initial setting time of UHPC after casting was observed to be 20–30 h after casting under normal temperature and humidity conditions. Furthermore, the distribution of shrinkage-induced strain in UHPC was found to be more pronounced near the edges and less significant in the middle, whereas the steel plate experienced more prominent effects at the center. The simulation results were consistent with the experimental trends, with explainable errors. Additionally, simulations indicated that the shrinkage effects worsened closer to the center of the specimen. Overall, the research outcomes provide valuable information for addressing shrinkage-induced strain-related issues in Steel-UHPC composite decks with low fiber content.