| 混凝土桥梁构件服役期的抗力概率模型 |
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| 引用本文： | 张建仁,刘扬. 混凝土桥梁构件服役期的抗力概率模型[J]. 长沙理工大学学报(自然科学版), 2004, 1(1): 27-33 |
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| 作者姓名： | 张建仁 刘扬 |
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| 作者单位： | 长沙理工大学,桥梁与结构工程学院,湖南,长沙,410076;长沙理工大学,桥梁与结构工程学院,湖南,长沙,410076 |
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| 基金项目： | 交通部重点科技项目(95-06-02-12)，交通部西部交通建设科技项目(200331882315) |
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| 摘 要： | 构件的抗力概率模型是进行混凝土桥梁服役期的动态可靠性研究的基础之一．结构的抗力随时间的变化是一个随机过程问题．结合实桥数据建立了桥梁构件中混凝土强度的历时变化模型，讨论了因锈蚀导致的钢筋强度和钢筋截面积的退化．在此基础上，研究了在不修复情况下桥梁构件抗力的概率模型应满足的基本条件，采用独立增量过程作为抗力的概率模型及采用回归拟合方法确定了混凝土桥梁构件服役期抗力的均值函数、方差函数和自相关系数，并进行了参数敏感性分析．
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| 关 键 词： | 桥梁工程 抗力概率模型 独立增量过程 钢筋锈蚀 结构构件 |
| 文章编号： | 1672-9331(2004)01-0027-07 |
| 修稿时间： | 2004-03-17 |
Statistical Models for the Lifetime Resistance of Concrete Bridges |
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| ZHANG Jian-ren,LIU Yang. Statistical Models for the Lifetime Resistance of Concrete Bridges[J]. Journal of Changsha University of Science and Technology(Natural Science), 2004, 1(1): 27-33 |
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| Authors: | ZHANG Jian-ren LIU Yang |
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| Abstract: | The changes in resistance of concrete components are time-dependent. Besides reduction in area of corrosion, some factors influencing the resistance such as degradation of steel and concrete strength, are studied in the paper. Moreover, several conditions the statis model for lifetime resistance should satisfy are introduced and a non-stationary random process is proposed to describe the lifetime resistance. This model has been applied in a case study of a simply-supported T girder of bridge. |
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| Keywords: | bridge engineering corrosion of bar structural component resistance statistical model |
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