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首页> 外文期刊>Journal of bridge engineering >Load Redistribution and Remaining Fatigue Life of Steel Built-Up Members Subjected to Flexure Following a Component Failure
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Load Redistribution and Remaining Fatigue Life of Steel Built-Up Members Subjected to Flexure Following a Component Failure

机译：部件失效后易受弯的钢制组合构件的载荷重分布和剩余疲劳寿命

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摘要

Built-up steel girders have been shown to be resistant to totalmember collapse in the event that a single component fails from brittle fracture or from fatigue. However, accurate methods to determine the remaining capacity of members with partially failed cross sections have not been addressed. Because the failure of a single component represents a localized failure, a simple flexural stress calculation of a member cross section, using only the remaining components, does not represent the actual member capacity. Additionally, a traditional linear stress distribution over the height of a flexural member is not accurate due to the load transfer, engagement of mechanical fasteners, and remaining portions of unfailed components. This paper will present the methods used in determining the localized stress distribution as well as how to estimate the appropriate levels of stress in partially failed built-up steel members. Results of experimental fatigue tests are presented along with an analytical parametric study investigating the localized stresses near a partially failed component. This information is critical in determining the strength capacity of members who have experienced a failure in one of the components, as well as determining the remaining fatigue life of built-up girders subjected to vehicular loads. (C) 2017 American Society of Civil Engineers.
机译：事实表明，如果单个组件因脆性断裂或疲劳而失效，则组合式钢梁可以抵抗全部构件的坍塌。但是，尚未确定用于确定横截面部分失效的构件的剩余容量的准确方法。因为单个组件的故障表示局部故障，所以仅使用其余组件的简单的构件横截面挠曲应力计算并不代表实际的构件承载力。另外，由于载荷传递，机械紧固件的接合以及未失效组件的剩余部分，在挠曲构件的高度上的传统线性应力分布是不准确的。本文将介绍确定局部应力分布的方法，以及如何估计部分失效的组合钢构件中适当的应力水平。提出了实验疲劳测试的结果以及分析参数化研究，该研究调查了部分失效组件附近的局部应力。该信息对于确定遭受其中一个组件故障的构件的强度能力以及确定承受车辆载荷的组合梁的剩余疲劳寿命至关重要。 （C）2017年美国土木工程师学会。

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