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浙江大学学报(工学版)
J4  2012, Vol. 46 Issue (4): 643-649    DOI: 10.3785/j.issn.1008-973X.2012.04.011
土木工程     
大气环境下服役公路梁桥结构时变可靠度分析
孙晓燕1, 潘宏2, 王海龙1, 王建秀3
1.浙江大学 建筑工程学院, 浙江 杭州 310027； 2.浙江杭萧钢构股份有限公司,浙江 杭州 310003；
3.北京市建筑工程设计有限公司,北京 100055
Time-dependent reliability analysis of existing bridges under
atmospheric environment
SUN Xiao-yan1, PAN Hong2, WANG Hai-long1, WANG Jian-xiu3
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, China;
2. Zhejiang Hangxiao Steel Structure Limited Company, Hangzhou 310003, China;
3. Beijing Construction Engineering Limited Company, Beijing 100055, China
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摘要：

为了准确评估钢筋锈蚀对大气环境下服役桥梁耐久性能影响,结合一般大气环境下钢筋锈蚀的系统研究成果和服役桥梁实际检测资料,综合考虑钢筋截面面积、屈服强度和黏结强度的降低,建立服役公路桥梁弯曲抗力退化时变模型,在现有运营荷载等级和服役周期基础上分析结构时变可靠度.针对一座实际服役桥梁开展分析,计算表明：在一般大气环境下综合考虑钢筋锈蚀对钢筋截面面积、屈服强度和黏结退化的影响,桥梁结构时变可靠度在31 a左右即下降到需要维修补强的程度,与工程实际的首次维修维修时间基本一致,远远提前于只考虑钢筋截面面积单因素简化模型预测时间.多因素模型预测的桥梁结构时变失效风险较其他模型明显增大,同时在各个蜕化因素中,黏结退化对结构承载力降低有显著影响.
Abstract:

In order to accurately evaluate the existing bridges durability performance under atmospheric corrosion, the research achievements related to rebar corrosion were integrated and combined with field measurement of existing bridges. A multi-factor time-dependent resistance model of bridge bending capacity was established with degradation in rebar area, yield strength and bonding considered. The system reliability was investigated based on practical current live load level and service time. The case study of one real existing bridge shows that the initial maintenance time predicted by multi-factor model is 31 years, which is consistent with the bridge management situation, that is earlier than the single-factor model prediction. The failure risk predicted from multi-factors model is obviously higher than that gotten from other models. The bonding degradation should be the significant factor in the bridge durability analysis.
出版日期: 2012-05-17
:  TB 114.3  
基金资助:

 国家“863”高技术研究发展计划资助项目(2007AA04Z437)；国家自然科学基金资助项目（50808158）；浙江省重点科技创新团队资助项目（2010R50034）；浙江省自然科学基金资助项目（Y107049）；高等学校博士学科点专项科研基金资助项目（200803351117）;杭州市科技计划软科学经费资助项目.
通讯作者: 王海龙，男，副教授.     E-mail: hlwang@zju.edu.cn
作者简介: 孙晓燕（1976—）,女,副教授,从事桥梁结构健康监测、既有桥梁评估和维修的研究.E-mail: selina@zju.edu.cn
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引用本文:

孙晓燕, 潘宏, 王海龙, 王建秀. 大气环境下服役公路梁桥结构时变可靠度分析[J]. J4, 2012, 46(4): 643-649.

SUN Xiao-yan, PAN Hong, WANG Hai-long, WANG Jian-xiu. Time-dependent reliability analysis of existing bridges under
atmospheric environment. J4, 2012, 46(4): 643-649.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2012.04.011    或    http://www.zjujournals.com/eng/CN/Y2012/V46/I4/643

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