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Reliability assessment and updating of notched timber components subjected to environmental and mechanical loading

机译：承受环境和机械载荷的缺口木材组件的可靠性评估和更新

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摘要

Cracking initiation and propagation are frequently recognized as main causes leading to failure of timber structures. Since the kinematics of both processes is largely influenced by environmental conditions, a comprehensive reliability assessment of notched structures should take into account such environmental factors. The main purpose of this paper is to propose a methodology for reliability assessment and updating of notched timber components based on mechanical (A-integral formulation) and reliability (simulation and Bayesian networks) methods, and experimental data. The A-integral formulation is used to estimate energy release rates in modes I and II by taking into account thermal effects; but its numerical implementation is time-consuming for uncertainty propagation. In order to deal with this problem, Bayesian networks were used for reliability assessment and updating. The experimental data used for updating purposes were obtained from measurements of deflection, temperature and relative humidity on a notched beam (Douglas Fir specie) exposed to outdoor environment and constant loading. The whole proposed methodology was illustrated with the reliability assessment and updating of the studied notched beam. The results indicated that the proposed approach is able to integrate measurements of temperature and deflection for reliability updating.
机译：裂纹的萌生和扩展通常被认为是导致木材结构失效的主要原因。由于这两个过程的运动学在很大程度上受环境条件的影响，因此对带缺口结构的全面可靠性评估应考虑到此类环境因素。本文的主要目的是基于机械（A积分公式）和可靠性（模拟和贝叶斯网络）方法以及实验数据，提出一种用于缺口木材组件可靠性评估和更新的方法。通过考虑热效应，使用A积分公式估算模式I和II中的能量释放速率。但是其数值实现对于不确定性传播是耗时的。为了解决这个问题，贝叶斯网络用于可靠性评估和更新。用于更新目的的实验数据是从暴露在室外环境和恒定载荷下的有缺口梁（Douglas Fir物种）的挠度，温度和相对湿度的测量中获得的。提出了整个方法，并通过可靠性评估和对缺口梁的更新进行了说明。结果表明，所提出的方法能够集成温度和挠度的测量值，以进行可靠性更新。

著录项

  • 来源
    《Engineering Structures》 |2018年第1期|107-116|共10页
  • 作者

    Tran T. -B.; Bastidas-Arteaga E.; Aoues Y.; Nziengui C. F. Pambou; Hamdi S. E.; Pitti R. Moutou; Fournely E.; Schoefs F.; Chateauneuf A.;

  • 作者单位

    Univ Nantes, Inst Res Civil & Mech Engn, UBL, GeM,Sea & Littoral Res Inst,CNRS UMR 6183,FR 3473, Nantes, France;

    Univ Nantes, Inst Res Civil & Mech Engn, UBL, GeM,Sea & Littoral Res Inst,CNRS UMR 6183,FR 3473, Nantes, France;

    INSA Rouen, Lab Optimisat & Fiabilite Mecan Struct LOFIMS, St Etienne Du Rouvray, France;

    Univ Clermont Auvergne, CNRS, Inst Pascal, Clermont Ferrand, France;

    Univ Clermont Auvergne, CNRS, Inst Pascal, Clermont Ferrand, France;

    Univ Clermont Auvergne, CNRS, Inst Pascal, Clermont Ferrand, France;

    Univ Clermont Auvergne, CNRS, Inst Pascal, Clermont Ferrand, France;

    Univ Nantes, Inst Res Civil & Mech Engn, UBL, GeM,Sea & Littoral Res Inst,CNRS UMR 6183,FR 3473, Nantes, France;

    Univ Clermont Auvergne, CNRS, Inst Pascal, Clermont Ferrand, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Timber; Bayesian network; Reliability; Updating; Mixed mode fracture; Viscoelasticity;

    机译：木材;贝叶斯网络;可靠性;更新;混合模式断裂;粘弹性;

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