Abstract Bridge decks are usually formed from profiled steel–concrete composite slabs, which consist of steel and concrete. Slip occurs at the interface between the concrete and steel, which results in unique mechanical and fatigue properties of the composite slab. The objective of this study is to investigate the mechanical and fatigue performance of profiled steel sheeting–concrete bridge decks subjected to vehicular loads. A new method for calculating the deflection of profiled steel sheeting–concrete composite slabs based on a discontinuous stiffness is proposed, and the deformation and internal force components of composite plates are deduced theoretically. The midspan deflection and end-slip calculated via this method are close to the experimental values. With a focus on the fatigue performance of the bridge deck, this paper discusses the fatigue design method of the composite slab and presents fatigue-check calculations for the Khartoum Al-Halfaia bridge over the Nile. A parameter analysis of the composite slab bridge was performed. The effects of the thickness and section geometry of the profiled steel plate and the strength grade and thickness of the concrete on the fatigue performance were investigated, and corresponding improvement measures were examined. It was found that the thickness and geometry of the section significantly affect the shear-stress amplitude of the plate end interface, while the concrete strength grade has little influence on the fatigue performance of the composite slab.

中文翻译：

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车辆荷载作用下压型钢板-混凝土桥面板的疲劳性能

摘要 桥面板通常由型钢-混凝土组合板构成，由钢和混凝土组成。滑移发生在混凝土和钢材之间的界面处，这导致复合板具有独特的机械和疲劳性能。本研究的目的是研究承受车辆载荷的压型钢板-混凝土桥面板的机械和疲劳性能。提出了一种基于非连续刚度的压型钢板-混凝土组合板挠度计算新方法，从理论上推导了组合板的变形和内力分量。通过该方法计算的跨中挠度和端部滑移与实验值接近。以桥面板的疲劳性能为重点，本文讨论了复合板的疲劳设计方法，并介绍了尼罗河上的 Khartoum Al-Halfaia 桥梁的疲劳校核计算。进行了组合板桥的参数分析。研究了压型钢板的厚度和截面几何形状以及混凝土的强度等级和厚度对疲劳性能的影响，并研究了相应的改进措施。研究发现，截面的厚度和几何形状对板端界面的剪应力幅值有显着影响，而混凝土强度等级对复合板的疲劳性能影响不大。对组合板桥进行了参数分析。研究了压型钢板的厚度和截面几何形状以及混凝土的强度等级和厚度对疲劳性能的影响，并研究了相应的改进措施。研究发现，截面的厚度和几何形状对板端界面的剪应力幅值有显着影响，而混凝土强度等级对复合板的疲劳性能影响不大。进行了组合板桥的参数分析。研究了压型钢板的厚度和截面几何形状以及混凝土的强度等级和厚度对疲劳性能的影响，并研究了相应的改进措施。研究发现，截面的厚度和几何形状对板端界面的剪应力幅值有显着影响，而混凝土强度等级对复合板的疲劳性能影响不大。