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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第1期    总第305期    2020年1月

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文章编号:1672-7207(2020)01-0213-08
斜拉索损伤对在役斜拉桥体系可靠度的影响
颜东煌1,郭鑫1, 2

(1. 长沙理工大学 土木工程学院,湖南 长沙,410114;
2. 长沙理工大学 长沙理工大公路工程试验检测中心,湖南 长沙,410007
)

摘 要: 为了研究拉索腐蚀与疲劳损伤对在役斜拉桥服役安全的影响,分析平行钢丝拉索斜拉桥的时变体系可靠度。采用串-并联模型研究平行钢丝索强度概率受拉索长度和数量的影响,对比拉索断裂产生的静力与动力效应,并基于更新响应面方法捕捉拉索断裂产生的非线性效应。基于钢丝的疲劳试验结果评估某双塔混凝土斜拉桥的时变体系可靠度。研究结果表明:腐蚀和未腐蚀拉索20 a的抗拉强度均值分别下降32%和13%,基于串-并联模型可捕捉钢丝长度和数量效应对拉索强度概率分布均值和标准差的影响;单根拉索断裂可导致相邻拉索索力静力效应增加7%,而动力效应达到11%;基于更新响应面方法采用20个均匀设计样本点即可捕捉到该非线性效应;在“疲劳”和“腐蚀-疲劳”这2种损伤作用下,该斜拉桥在第20年的结构体系可靠指标由4.62分别下降至4.42和和2.46,表明腐蚀效应对斜拉桥运营期体系可靠度影响显著。

 

关键字: 斜拉桥;斜拉索;体系可靠度;腐蚀;损伤

Influence of damage of stay cables on system reliability of in-service cable-stayed bridges
YAN Donghuang1, GUO Xin1, 2

1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;
2. Institute of Highway Detection, Changsha University of Science & Technology, Changsha 410007, China

Abstract:In order to study the influence of cable corrosion and fatigue damage on the service safety of in-service cable-stayed bridges, the reliability index of time-varying system of parallel steel cable cable-stayed bridges was analyzed. The series-parallel model was used to study the influence of the characteristic parameters of the parallel cable strength probability on the length and quantity of the cable. The static and dynamic effects generated by the cable break were compared, and the non-resistance response surface method was used to capture the nonlinear of the cable break. Based on the fatigue test results of steel wire, the reliability of time-varying system of a double-tower concrete cable-stayed bridge was evaluated. The results show that the average tensile strength of corrosion and uncorroded cables decreases by 32% and 13% after 20 a, respectively. Based on the series-parallel model, the length and quantity effects of the steel wire can be captured for the mean and standard deviation of the cable strength probability distribution. Single cable breaks can cause the static force effect of adjacent cables to increase by 7%, while the dynamic effect reaches 11%. This nonlinear effect can be captured by using 20 uniform design sample points based on the updated response surface method. With the two damages of fatigue and corrosion-fatigue, the reliability index of the cable-stayed bridge in the 20th year decreases from 4.62 to 4.42 and 2.46, respectively. This phenomenon indicates the significant effect of corrosion on the reliability of the cable-stayed bridge during the operation period.

 

Key words: cable-stayed bridge; stay cable; system reliability; corrosion; damage

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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