[1]薛晓锋,靳启文,王通行.多损伤场景下大跨径斜拉桥易损性[J].长安大学学报(自然科学版),2019,39(05):39-47.
　XUE Xiao feng,JIN Qi wen,WANG Tong xing.Structural vulnerability of longspan cablestayed bridge subjected to multiple damage scenarios effect[J].Journal of Chang’an University (Natural Science Edition),2019,39(05):39-47.
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多损伤场景下大跨径斜拉桥易损性()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第39卷
期数:
2019年05期
页码:
39-47
栏目:
桥梁与隧道工程
出版日期:
2019-09-15

文章信息/Info

Title:
Structural vulnerability of longspan cablestayed bridge subjected to multiple damage scenarios effect
作者:
薛晓锋; 靳启文; 王通行
（1. 长安大学 旧桥检测与加固技术交通行业重点试验室，陕西 西安 710064； 2. 河南工业大学 土木建筑学院，河南 郑州 450001）
Author(s):
 XUE Xiaofeng;  JIN Qiwen;  WANG Tongxing
（1. Key Laboratory of Bridge Detection Reinforcement Technology, Ministry of Communications, Chang’an University, Xi’an 710064, Shaanxi, China; 2. College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, Henan, China）
关键词:
桥梁工程; 拉索性能退化; 结构易损性; 大跨径斜拉桥; 分离式钢箱梁; 结构健康监测
Keywords:
bridge engineering;  performance degradation of stay cable;  structural vulnerability;  longspan cablestayed bridge;  separated steel box girder;  SHM
文献标志码:
A
摘要:
为了研究大跨径双索面斜拉桥易损斜拉索部位，进一步优化结构健康监测传感器布置方案，基于大跨径斜拉桥结构特点及受力性能，以斜拉桥主梁屈曲安全系数和应力安全系数为评价指标，以大跨径全漂浮分肢柱式塔四索面分离式钢箱梁斜拉桥为依托，采用有限元分析软件，分别采用Beam4梁单元和Link10桁架单元模拟塔/梁构件和拉索构件，建立该斜拉桥的三维有限元空间模型；计算分析了拉索整体性能退化、单根断索、单对断索3类损伤场景下149个工况的主梁屈曲安全系数和应力安全系数。分别考虑结构损伤比例和所造成损伤程度，采用Pareto多目标评价方法，根据结构最小损伤比例作用所造成结构损伤程度最大的优化原则，分别研究了3类损伤场景下斜拉索的易损性，确定了易损斜拉索的部位。研究结果表明：成桥拉索索力随着索长的增加而逐渐增大，内侧索力基本大于外侧索力；拉索整体性能退化程度从无损伤到损伤增加至30%，主梁屈曲安全系数呈线性增大趋势，应力安全系数呈线性减小趋势，但二者变化幅度均较小；单根断索或者单对断索损伤场景下，易损拉索为中跨10#、边跨6#，较易损拉索为1#~5#、7#~9#等。该结果可为研究双塔双索面钢箱梁斜拉桥斜拉索的易损薄弱部位，布控长期监测传感器和提高结构安全性提供科学依据和参考。
Abstract:
To study the vulnerability of the cablestayed bridge with long span and double cable planes, and optimize the sensor placement for structural health monitoring (SHM), the structural characteristics and mechanical properties of this type of bridge were considered. The buckling and stress safety factors were selected as evaluation indexes. One floating longspan cablestayed bridge with split column towers and split steel box girders and four cable was considered as an example, and the finite element model was established, and towers/girders 〖HJ1.65mm〗component, and cables component were simulated by elements Beam4 and Link10, respectively. The buckling safety factor and stress safety factor of the main beam under 149 working conditions in the three types of damage scenarios, such as overall performance degradation, single cable and singlepair cable broken, were calculated and analyzed. The proportion of structural damage and the corresponding damage degree were also considered. According to the principle that the minimum damage ratio causes the largest damage degree, the vulnerable cable subjected to three kinds of damage scenarios were studied and determined based on the Pareto optimization method.The results show that the cable force increases gradually with an increase in cable length, and the interior cable force inside is usually greater than that at the exterior. The overall performance degradation of the cable increases from nondamage to damage to 30% of the main girder. The buckling safety factor of the main girder show a linearly increases, while the stress safety factor show a linearly decreases, both the change range of them are small. Under single cable broken and single pair cable broken scenarios, cables 10# and 6# (both outside and inside) are the most vulnerable scenarios, and cables 1# to 5# and cables 7# to 9# follow. It can provide scientific basis and reference for the vulnerable parts of cables study of double tower and double cable planes steel box girders, sensor placement of this kind of bridge, and structural safety can be further enhanced. 2 tabs, 14 figs, 28 refs.

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更新日期/Last Update: 2019-10-16