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Fatigue reliability evaluation of short-span concrete bridges under dynamic impacts of stochastic truck loading

机译:随机卡车装载动态冲击下短跨度混凝土桥梁疲劳可靠性评价

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摘要

This study presents an approach for the fatigue stress spectrum simulation of short-span bridges under the dynamic impacts of stochastic traffic loading. This approach is utilised to evaluate the fatigue reliability of existing bridges. Response functions defined by intervals are used to approximate the equivalent fatigue stress range of the bridge. Probability models of the fatigue stress ranges are evaluated with Gaussian mixture models. The effectiveness of the proposed method is validated via a case study of a simply supported bridge. The numerical results indicate that the impact effect of vehicle loads on short-span bridge leads to an obvious increase in both the stress range and the number of stress cycles. Both the degradation of the road surface roughness condition and the traffic growth lead to a significant decrease in the fatigue reliability.
机译:本研究提出了一种在随机交通荷载动态影响下的短跨度桥梁疲劳应力谱谱的方法。 这种方法用于评估现有桥梁的疲劳可靠性。 间隔定义的响应函数用于近似桥的等效疲劳应力范围。 通过高斯混合模型评估疲劳应力范围的概率模型。 通过简单支持的桥梁的案例研究验证了所提出的方法的有效性。 数值结果表明,车辆荷载对短跨度桥梁的冲击效应导致应力范围和应力循环次数的明显增加。 道路表面粗糙度条件的劣化和交通增长都导致疲劳可靠性的显着降低。

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