[1]王莹,李兆霞,赵丽华.大跨钢桥钢箱梁损伤时变模型及疲劳可靠性评估[J].东南大学学报(自然科学版),2013,43(5):1017-1023.[doi:10.3969/j.issn.1001-0505.2013.05.020]
　Wang Ying,Li Zhaoxia,Zhao Lihua.Time-varying damage model and fatigue reliability assessment for box-girder of long-span steel bridge[J].Journal of Southeast University (Natural Science Edition),2013,43(5):1017-1023.[doi:10.3969/j.issn.1001-0505.2013.05.020]
点击复制

大跨钢桥钢箱梁损伤时变模型及疲劳可靠性评估()
分享到：

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
43
期数:
2013年第5期
页码:
1017-1023
栏目:
交通运输工程
出版日期:
2013-09-20

文章信息/Info

Title:
Time-varying damage model and fatigue reliability assessment for box-girder of long-span steel bridge
作者:
王莹; 李兆霞; 赵丽华
东南大学土木工程学院, 南京 210096; 东南大学江苏省工程力学分析重点实验室, 南京 210096
Author(s):
Wang Ying;  Li Zhaoxia;  Zhao Lihua
School of Civil Engineering, Southeast University, Nanjing 210096, China
Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 210096, China
关键词:
大跨斜拉桥;  索梁锚固区;  表面裂纹;  损伤时变模型;  应力强度因子;  疲劳状态评估
Keywords:
long span cable-stayed bridge;  cable-girder anchorage structure;  surface crack;  modified model with cracking;  stress intensity factor;  fatigue assessment
分类号:
U441.4
DOI:
10.3969/j.issn.1001-0505.2013.05.020
摘要:
以润扬长江公路大桥北汊斜拉桥为研究对象,建立了包含桥梁整体结构、索梁锚固区构件及含表面裂纹焊接细节的多尺度模型,采用子模型法获得了索梁锚固区域中应力集中区和裂纹尖端应力场分布,分析了疲劳裂纹长度对应力强度因子的影响,研究了不同长度的初始裂纹的疲劳寿命和考虑检测信息的疲劳可靠度的更新情况.研究结果表明,采用损伤时变特性尤其是易发生的裂纹信息进行多尺度模型更新,可实现桥梁索梁锚固区域中复杂受力区的局部应力分布和疲劳状态可靠度的更新分析,为含裂纹桥梁结构的疲劳状态评定提供了一种精确分析方法,一定程度上可弥补桥梁健康监测系统无法反映复杂构型局部焊缝区域应力分布规律的不足.
Abstract:
A multi-scale analytical model of the Runyang Cable-stayed Bridge was developed. This model includes the macro box-girder model, the microscopic cable-girder anchorage zone model, and the mesoscopic crack model. The distribution of stress in the concentration zone of the anchorage structure and the crack tip was obtained by the sub-model method. The effect of the crack length on the stress intensity factor was investigated. The fatigue life under different initial cracks and fatigue failure probability considering the inspection messages were investigated. The results show that employing time-varying damage information, especially crack information, to update multi-scale analytical model, can improve the analysis of local stress distribution in complicated stress zone and update fatigue reliability index. It is an effective method to assess fatigue state of bridges with crack. To some extent, it can circumvent the problem that the structural health monitoring system cannot detect stress distribution of the weld zone.

参考文献/References:

[1] Li Z X. Concurrent multi-scale modeling of civil infrastructures for analyses on structural deteriorating.Part Ⅰ: modeling methodology and strategy[J]. Finite Element in Analysis and Design, 2009, 45(11): 782-794.
[2] Wang Y, Li Z X, Wang C M. Concurrent multifactor optimisation techniques for model updating of long-span bridges[J]. Structure and Infrastructure Engineering, 2013, 9(6): 578-593.
[3] 孙正华, 李兆霞, 陈鸿天.结构行为一致多尺度有限元模型修正及验证[J]. 东南大学学报:自然科学版, 2009, 39(1): 85-90.
　　Sun Zhenghua, Li Zhaoxia, Chen Hongtian. Updating and verification for multi-scale finite element model of structure behavior [J]. Journal of Southeast University: Natural Science Edition, 2009, 39(1): 85-90.(in Chinese)
[4] Liu Xiumin, Chen Congxin, Zhen Yun. Stability and failure mechanism of tunnel anchorage for suspension bridge [J]. Disaster Advances,2012, 5(1): 181-186.
[5] Timosidis D, Pantazopoulou S J. Anchorage of longitudinal column reinforcement in bridge monolithic connections [J]. Journal of Structural Engineering,ASCE, 2009, 135(4): 344-355.
[6] 瞿伟廉, 何杰, 王文利.基于子模型法的钢桁桥整体节点动力相应分析[J]. 地震工程与工程振动,2009, 29(3): 95-100.
　　Zhai Weilian, He Jie, Wang Wenli. Dynamic stress analysis of monolithic joint of steel truss bridge based on submodel method [J]. Journal of Earthquake Engineering and Engineering Vibration, 2009, 29(3): 95-100.(in Chinese)
[7] Chan T H T. Hot spot stress approach for Tsing Ma Bridge fatigue evaluation under traffic using finite element method [J]. Structural Engineering and Mechanics, 2005, 19(3): 261-279.
[8] 赵建华. 断裂力学在桥梁裂纹检测分析中的应用[D]. 西安: 长安大学工程力学学院, 2008.
[9] BSI. BS 5400 Code of practice for fatigue[EB/OL].(1982-03)[2012-04-08]. http://zh.scribd.com/doc/64041770/BS5400-10-1980-Code-of-Practice-for-Fatigue.
[10] BSI. BS 7910 Guide to methods for assessing the acceptability of flaws in metallic structures[EB/OL].(2005-07)[2012-04-08]. http://shop.bsigroup.com/ProductDetail/?pid=000000000030164728.
[11] 王春生, 刘鑫, 俞欣, 等. 基于无损探测信息的既有钢桥构件疲劳可靠度更新评估[J]. 土木工程学报, 2010, 43(8): 81-87.
　　Wang Chunsheng, Liu Xin, Yu Xin, et al. Fatigue reliability updating evaluation using nondestructive inspections for existing steel bridges[J]. China Civil Engineering Journal, 2010, 43(8): 81-87.(in Chinese)

备注/Memo

备注/Memo:
作者简介: 王莹(1980—),女,博士,讲师;李兆霞(联系人),女,博士,教授,博士生导师,zhxli@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(11072060, 51008069)、江苏省优势学科资助项目.
引文格式: 王莹,李兆霞,赵丽华.大跨钢桥钢箱梁损伤时变模型及疲劳可靠性评估[J].东南大学学报:自然科学版,2013,43(5):1017-1023. [doi:10.3969/j.issn.1001-0505.2013.05.020]
更新日期/Last Update: 2013-09-20