The rigorous modeling of traveling loads on bridges in a dynamic regime is not an easy task as the traveling load contributes to the dynamic of the structural system with its mass and damping. In this paper, a simplified approach for traveling loads on bridges in dynamic regime is proposed. The main simplification consists in neglecting the traveling mass. The validity of the proposed simplification is checked with a sensitivity analysis considering a few realistic case-study bridges. The ranges of velocity and traveling-force/bridge-weight ratio are identified. Eventually, the proposed methodology is applied to two case studies, (i) an existing Italian reinforced concrete viaduct and (ii) a pedestrian bridge. The applications show that the proposed simplified approach can be applied to a range of civil engineering problems such as the quantification of the structural reliability of existing structures or the assessment of pedestrian comfort.

中文翻译：

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动态状态下桥梁行进载荷有限元建模的计算框架

在动态状态下对桥梁上的行进载荷进行严格建模并非易事，因为行进载荷通过其质量和阻尼对结构系统的动态做出贡献。在本文中，提出了一种在动态状态下在桥梁上行驶荷载的简化方法。主要的简化在于忽略行进质量。考虑到一些实际的案例研究桥梁，通过敏感性分析检查了所提出的简化的有效性。确定了速度和行驶力/桥重比的范围。最终，所提出的方法应用于两个案例研究，（i）现有的意大利钢筋混凝土高架桥和（ii）人行天桥。