| 平面预应力钢桁架整体可靠性分析 |
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| 引用本文： | 王新堂,杨晓明,李俊华.平面预应力钢桁架整体可靠性分析[J].特种结构,2005,22(4):61-64. |
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| 作者姓名： | 王新堂 杨晓明 李俊华 |
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| 作者单位： | 1. 宁波大学建筑工程与环境学院,315211
2. 青岛理工大学建筑设计研究院,266033 |
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| 基金项目： | 宁波市重点博士基金项目(2004A610019) |
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| 摘 要： | 本文首先基于随机摄动理论建立了具有弹性约束的索张拉预应力钢桁架结构随机内力统计特性分析的计算公式,整体结构的基本随机参数包括折线索单元和桁架单元的截面面积(或综合刚度)、张拉钢索的预拉力、外荷载及约束刚度等。利用一次二阶矩法建立了任意单元失效模式的可靠度指标与验算点的迭代模型,并基于点估计法得到了整体结构可靠性指标的计算模型。通过数值分析对影响整体结构可靠性指标的有关参数进行了讨论,得到了一些有益的结论,为索张拉预应力钢结构整体可靠性设计奠定了一定的基础。
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| 关 键 词： | 预应力钢结构 一次二阶矩 点估计法 整体可靠性 |
Analysis of Structure System Reliability of Planar Prestressed Steel Trusses |
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| Wang Xintang,Yang Xiaoming,Li Junhua.Analysis of Structure System Reliability of Planar Prestressed Steel Trusses[J].Special Structures,2005,22(4):61-64. |
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| Authors: | Wang Xintang Yang Xiaoming Li Junhua |
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| Affiliation: | (1.Faculty of Architectural,Civil Enginnering and Environment,Ningbo University,315211,China, 2.Qingdao Technological University,266033,China) |
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| Abstract: | Based upon random perturbation theories,the computational model of statistical chracteristics of random internal forces of the planar prestressed steel trusses with elastic restraint is first established,in which the random parameters of areas of cross sections of all the elements,area of cables,pretension of cables,external forces and stiffness of elastic restraint are considered.First Order Second Moment is used to establish the computational model of reliability index of each element,and reliability index of the structural system is further obtained with the method of Point Evalution Techique.Finally,some computational examples are put forward and the results are discussed to obtain some useful conclusions,which lay a fundation for reliability analysis of the prestressed steel structural system. |
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| Keywords: | Prestressed steel trusses First order second moment Point evalution technique Structural system reliability |
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