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刘国光,杨跃敏,武志玮. 基于耦合概率法的空间杆系结构失效概率分析[J]. 科学技术与工程, 2021, 21(8): 3244-3251.
LIU Guo-guang,YANG Yue-min,WU Zhi-wei.Failure Probability Analysis of on Spatial Truss Structure by Coupling Probability Method[J].Science Technology and Engineering,2021,21(8):3244-3251.
基于耦合概率法的空间杆系结构失效概率分析
Failure Probability Analysis of on Spatial Truss Structure by Coupling Probability Method
投稿时间:2020-06-22  修订日期:2020-07-29
DOI:
中文关键词:  空间结构  耦合概率分析  星型穹顶  杆件移除法  结构失效
英文关键词:spatial structure  coupling probability analysis  star-type dome  member removal  structural failure
基金项目:天津市教委科研计划项目(2018KJ243)
        
作者单位
刘国光 中国民航大学机场学院
杨跃敏 中国民航大学机场学院
武志玮 中国民航大学机场学院
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中文摘要:
      结构失效概率的量化计算是预测结构剩余寿命的重要途径之一。本文以结构三阶耦合失效理论为基础,通过应力变化率法和杆件移除法相结合评价单元杆件失效模态的相关系数,建立了一种空间杆系结构失效概率计算的新方法。首先采用耦合概率法分析得到了结构在不同子系统破坏模式下失效概率上界与下界的表达式,并与泰勒展开法进行验证比较分析。同时进行了六角星型穹顶结构破坏实验,最后通过应力变化率法分析了结构加载破坏全过程的杆件内力时程曲线,总结了六角星型穹顶结构破坏与耦合失效概率区间的变化规律。结果表明,耦合概率法能够很好地展示多子系统间的组合失效结果,将多维积分转化为一维积分,具有较高的计算精度的同时仍具有很好地适用性,可用于计算空间杆系结构失效概率区间,预测结构破坏模态并量化评价结构可靠性。
英文摘要:
      Numerical calculation of structural failure probability is one of an important approach to predict structure remained service life. A novel method was developed to calculate the failure probability of spatial truss structure based on the theory of three-order coupling failure of a structural system. In this method, the stress change rate method and element-removing method were combined to evaluate correlation coefficient of failure modes of the bar. The coupling probability method was applied to analyze the expression of the upper and lower bounds of structural function under different failure modes, and it was verified and compared with the Taylor expansion method. Besides, damage test of a six star-type dome was conducted. By which, the time history of stress of bar was recorded during the process by a stress rate method, and the variation characteristics of six star-type dome failure and structural failure probability intervals were concluded. The results show that the coupling probability method can well show the combined failure results among multiple subsystems. The method of converting multi-dimensional integrals into one-dimensional integrals has high calculation accuracy and good applicability. It can be used effectively to analyze the failure profanity of spatial truss structure and predict structure failure mode and analyze structural characteristics in numerical.
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