| 钢筋混凝土桥梁构件的时变可靠度分析 |
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| 引用本文： | 张宇贻,秦权.钢筋混凝土桥梁构件的时变可靠度分析[J].清华大学学报(自然科学版),2001,41(12):65-67. |
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| 作者姓名： | 张宇贻 秦权 |
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| 作者单位： | 清华大学土木工程系,北京,100084 |
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| 基金项目： | 国家“攀登计划 B”项目“重大土木与水利工程完全性与耐久性的基础研究” |
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| 摘 要： | 桥梁蜕化降低了桥梁的抗力 ,增加其不定性 ,降低了桥梁的可靠度。该文根据混凝土中氯离子扩散及其引起的钢筋锈蚀的机理 ,建立了钢筋混凝土构件的蜕化模型 ,并运用 Monte Carlo方法计算了锈蚀钢筋混凝土构件在和平稳二项活荷载过程和随机恒荷载联合作用下的时变失效概率。结果表明 :活荷载变异系数影响最大 ,活荷载变化次数其次 ,活荷载的出现概率也有一定影响。恒荷载变异系数和抗力初始值的变异系数的影响很小。
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| 关 键 词： | 结构蜕化 时变可靠度 钢筋锈蚀 |
| 文章编号： | 1000-0054(2001)12-0065-03 |
| 修稿时间： | 2000年7月18日 |
Time-dependent reliability analysis of deteriorating RC bridge girders |
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| ZHANG Yuyi,QIN Quan.Time-dependent reliability analysis of deteriorating RC bridge girders[J].Journal of Tsinghua University(Science and Technology),2001,41(12):65-67. |
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| Authors: | ZHANG Yuyi QIN Quan |
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| Abstract: | A deteriorating resistance model of corroded RC bridge girders was developed to evaluate the time dependant failure probabilities of the girders. The model is based on the mechanisms of chloride diffusion in concrete and steel corrosion. The model combines the effects of life loading with a stationary binomial process and a random dead load using the Monte Carlo method. The failure probability and its sensitivities to six factors were calculated. The results show that the three factors relating to traffic load, i.e. the coefficient of deviation, the ratio of the design working life to the interval length of its Poisson square wave and the existence probability in each interval, most significantly influence the failure probability. |
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| Keywords: | structure deterioration time dependent reliability reinforcement corrosion |
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