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首页> 外文期刊>Journal of structural engineering >Repairing Distortion-Induced Fatigue Cracks in Steel Bridge Girders Using Angles-with-Plate Retrofit Technique. Ⅱ: Computer Simulations
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Repairing Distortion-Induced Fatigue Cracks in Steel Bridge Girders Using Angles-with-Plate Retrofit Technique. Ⅱ: Computer Simulations

机译：使用板角改造技术修复钢桥梁中的变形引起的疲劳裂纹。 Ⅱ：计算机仿真

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This paper presents the results from computer simulations of 914 mm (36 in.) deep girder-cross frame subassemblies to study the effects of distortion-induced fatigue and to evaluate the effectiveness of a newly proposed cost-effective retrofit measure. The proposed retrofit measure consists of adding steel angles connecting the girder web and the transverse connection plate (CP), and a steel plate on the back side of the girder web. The retrofit measure is intended to reduce stress demand at the welds, to restrain the web-gap region from deforming in the out-of-plane direction, and to distribute lateral forces transferred by cross-frames over a wider region of the web. Parametric studies were carried out to determine the optimal configuration to prevent growth of fatigue cracks of various lengths in the web-gap region. It was found that the proposed retrofit measure reduced peak stress demands with respect to the unretrofitted configuration by 50% or more, making it likely that it will prevent fatigue crack reinitiation. The parametric studies showed that the proposed retrofit measure became more effective in reducing the peak stress demand as the stiffness of the elements increased, with the lowest average stress demand occurring when the angles and backing plate were assigned thicknesses equal to 2.67 times the thickness of the web. Experimental verification of this study is presented in a companion paper.
机译：本文介绍了914毫米（36英寸）深梁交叉框架子组件的计算机仿真结果，以研究变形引起的疲劳的影响并评估新提议的具有成本效益的改造措施的有效性。拟议的改造措施包括增加用于连接腹板腹板和横向连接板（CP）的角钢，以及在腹板腹板后侧的钢板。改造措施旨在减少焊缝处的应力需求，限制腹板间隙区域在平面外方向上变形，并将横向框架传递的横向力分布在腹板的较宽区域。进行了参数研究，以确定最佳的构型，以防止在幅隙区域内出现各种长度的疲劳裂纹。已经发现，提出的改型措施相对于未改型的构型将峰值应力需求降低了50％或更多，从而有可能防止疲劳裂纹的重新出现。参数研究表明，随着单元刚度的增加，拟议的改造措施在降低峰值应力需求方面变得更加有效，当角钢和背板的厚度等于壁厚的2.67倍时，平均应力需求最低。网络。该研究的实验验证在随附的论文中进行。

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