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首页> 外文期刊>Journal of bridge engineering >Strain Energy-Based Fatigue Life Evaluation of Deck-to-Rib Welded Joints in OSD Considering Combined Effects of Stochastic Traffic Load and Welded Residual Stress
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Strain Energy-Based Fatigue Life Evaluation of Deck-to-Rib Welded Joints in OSD Considering Combined Effects of Stochastic Traffic Load and Welded Residual Stress

机译：考虑随机交通荷载和焊接残余应力共同作用的OSD甲板-肋骨焊接接头基于应变能的疲劳寿命评估

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摘要

Welded residual stress and stochastic traffic at the deck-to-rib welded joints in the orthotropic steel deck (OSD) of bridges highly affects the fatigue life of bridges. This study presents a strain energy-based method to evaluate the service life of welded joints in the OSD considering the combined effects of traffic load and welded residual stress. Thermomechanical analysis is performed for the welding process of the welded joints using a finite-element model to analyze the distribution of welded residual stress at critical locations of the welded joints. An analysis model is developed to simplify the nonlinear superposition of vehicle-induced stress and welded residual stress. A modified strain energy-based fatigue evaluation approach is presented based on the superposition of stresses. Based on the presented model, a new W-a-N-f curve is proposed to take the effects of welded residual stress into consideration. The presented method is validated against experimental results, and then it is applied to investigate the fatigue life of welded joints in an in-service cable-stayed bridge. The theoretical and inspection results are compared and analyzed. The results show that there is a better coincidence between the predicted fatigue life using the presented approach and the inspected fatigue life in contrast with the conventional approach of neglecting the effects of welded residual stress. (C) 2017 American Society of Civil Engineers.
机译：正交异性钢桥面（OSD）的桥面至肋间焊接缝处的焊接残余应力和随机流量会极大地影响桥梁的疲劳寿命。这项研究提出了一种基于应变能的方法来评估OSD中焊接接头的使用寿命，其中考虑了交通负荷和焊接残余应力的综合影响。使用有限元模型对焊接接头的焊接过程进行热力学分析，以分析焊接接头关键位置的焊接残余应力分布。建立了一个分析模型来简化车辆引起的应力和焊接残余应力的非线性叠加。提出了一种基于应力叠加的改进的基于应变能的疲劳评估方法。在此模型的基础上，提出了一条新的W-a-N-f曲线，以考虑焊接残余应力的影响。通过实验验证了所提方法的有效性，然后将其应用于在役斜拉桥焊接接头的疲劳寿命研究。对理论和检验结果进行了比较和分析。结果表明，与传统的忽略焊接残余应力影响的方法相比，使用本文提出的方法预测的疲劳寿命与检查的疲劳寿命之间具有更好的一致性。 （C）2017年美国土木工程师学会。

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  • 来源
    《Journal of bridge engineering》 |2018年第2期|04017127.1-04017127.15|共15页
  • 作者

    Cui Chuang; Bu Yizhi; Bao Yi; Zhang Qinghua; Ye Zhongtao;

  • 作者单位

    Southwest Jiaotong Univ, Dept Bridge Engn, 111 Sect Northbound,1 Second Ring Rd, Chengdu 610031, Sichuan, Peoples R China;

    Southwest Jiaotong Univ, Dept Bridge Engn, 111 Sect Northbound,1 Second Ring Rd, Chengdu 610031, Sichuan, Peoples R China;

    Missouri Univ Sci & Technol, Dept Civil Architectural & Environm Engn, 1401 North Pine St, Rolla, MO 65401 USA;

    Southwest Jiaotong Univ, Dept Bridge Engn, 111 Sect Northbound,1 Second Ring Rd, Chengdu 610031, Sichuan, Peoples R China;

    State Key Lab Bridge Struct Hlth & Safety, 103 JianShe Rd, Wuhan 430034, Hubei, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fatigue lifetime assessment; Orthotropic steel deck (OSD); Stochastic vehicle load; Strain energy method; Welded residual stress;

    机译：疲劳寿命评估;正交异性钢甲板;随机车辆载荷;应变能法;焊接残余应力;

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