新型波形钢-UHPC组合桥面板抗弯性能研究
Research on Flexural Performance of Undulating Steel-UHPC Composite Bridge Decks
文中提出了一种新型波形钢-超高性能混凝土(ultra-high performance concrete, UHPC)组合桥面板结构体系,围绕该类桥面板的抗弯性能开展深入研究,为进一步探究其疲劳性能奠定基础。首先,针对该组合桥面板结构设计制作了3个试件,并对其进行了3组正弯矩作用下的足尺模型试验,探究不同剪跨长度下结构的破坏模式、承载能力、钢-UHPC层间滑移等关键力学指标的发展规律。在此基础上,建立了考虑UHPC材料非线性和钢-UHPC层间接触非线性的有限元模型,用于确定新型组合桥面板结构关键设计参数及其对结构性能的影响规律。最后,基于塑性理论建立了适用于新型组合桥面板极限承载能力预测的理论模型。结果表明:正弯矩作用下新型组合桥面板的破坏形式均为弯曲破坏,结构的承载能力和变形能力均随着剪跨长度的减小而增大;所建立的有限元模型能准确模拟结构的受力特性,可用于研究不同参数对结构受力特性的影响规律,其中剪跨长度、波形钢高度和组合销数量是影响结构受力特性的关键设计参数;所建立的新型组合桥面板承载能力理论模型可准确预测其极限承载能力,相关研究成果可为该组合桥面板的工程应用提供参考。
A novel undulating steel-UHPC composite bridge deck system was proposed, and its flexural performance was comprehensively investigated to provide a foundation for future studies on fatigue behavior. Full-scale model tests were conducted under three sets of positive bending moments to examine failure modes, load-bearing capacities, and the evolution of key mechanical parameters, such as interlayer slip between steel and UHPC, under varying shear span lengths. Based on the experimental results, a finite element model incorporating the nonlinear properties of UHPC and the interlayer contact behavior between steel and UHPC was developed. This model was applied to analyze the influence of critical design parameters on the performance of the composite deck system. Furthermore, a theoretical model grounded in plasticity theory was established to predict the ultimate load-bearing capacity of the system. The findings revealed that the failure mode of the composite deck system under positive bending moments is bending failure. Both the load-bearing and deformation capacities increase as the shear span length decreases. The finite element model accurately captured the structural behavior and proved effective in investigating the effects of design parameters. Key factors influencing structural performance include shear span length, undulating steel height, and the number of shear connectors. The theoretical model provided reliable predictions of ultimate load-bearing capacity, offering a solid basis for the design and application of the novel composite bridge deck system in engineering practice.
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国家自然科学基金(52408217)
桥梁结构健康与安全国家重点实验室开放课题(BHSKL19-06-KF)
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