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首页> 外文学位 >Elastic bending moment and shear force limit states of steel bridge plate girders considering fatigue crack growth.
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Elastic bending moment and shear force limit states of steel bridge plate girders considering fatigue crack growth.

机译：考虑疲劳裂纹扩展的钢桥平板梁的弹性弯矩和剪力极限状态。

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摘要

The passage of vehicular traffic over short-span steel highway bridges generates cumulative fatigue damage within the supporting plate girders. Over time, fatigue crack growth may lead to the untimely occurrence of elastic limit states which may cause a bridge to become structurally deficient or even collapse. It may be useful for structural engineers to be able to design or otherwise modify plate girders for presumed through-thickness fatigue crack configurations so that the premature occurrence of elastic limit states may be averted. The objective of this research was to develop theoretical expressions for the residual bending moment and shear force strengths of I-shaped, transversely stiffened, steel plate girders corresponding to various elastic limit states. Several through-thickness fatigue crack configurations were considered. The formulation of the expressions employed various theories from solid mechanics including elasticity theory, linear elastic fracture mechanics, classical plate theory, and the principle of stationary potential energy. Finite element analyses were then conducted to validate the formulated expressions. The correspondence between the analytical and numerical results was generally in good agreement. Plots of the formulated and validated expressions as functions of crack length and load cycle demonstrated that various elastic limit states influence the overall residual strength of a fatigue-cracked plate girder at varying scales; certain limit states may be neglected in favor of more detrimental limit states. A design procedure for modifying the initial design of a plate girder for prescribed fatigue crack configurations was finally developed and demonstrated by employing the newly formulated and validated expressions.
机译：车辆通过短跨度的钢质公路桥梁时，会在支撑板梁内产生累积的疲劳损伤。随着时间的流逝，疲劳裂纹的增长可能会导致弹性极限状态的不合时宜的出现，从而可能导致桥梁结构上的缺陷甚至崩溃。对于结构工程师来说，能够针对假定的全厚度疲劳裂纹配置设计或修改板梁可能很有用，这样可以避免过早出现弹性极限状态。这项研究的目的是为与各种弹性极限状态相对应的I形，横向加劲的钢板梁的残余弯矩和抗剪强度制定理论表达式。考虑了几种贯穿厚度的疲劳裂纹构造。表达式的表述采用了来自固体力学的各种理论，包括弹性理论，线性弹性断裂力学，经典板理论和静态势能原理。然后进行有限元分析以验证所表达的表达式。分析结果与数值结果之间的对应关系总体上吻合良好。根据裂纹长度和载荷循环的函数所公式化并验证的表达式的图线表明，各种弹性极限状态会以不同的比例影响疲劳裂纹板梁的总体残余强度。某些极限状态可能会被忽略，而倾向于更多有害的极限状态。最终开发出了一种设计程序，该程序修改了用于规定疲劳裂纹构造的板梁的初始设计，并通过使用新制定和验证的表达式进行了演示。

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  • 作者

    Mendes, Sebastian B.;

  • 作者单位

    University of Rhode Island.;

  • 授予单位 University of Rhode Island.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 319 p.
  • 总页数 319
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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