[1]张鹏飞,殷志欢,常军.复杂应力耦合作用下斜拉桥正交异性桥面板疲劳断裂[J].长安大学学报(自然科学版),2021,41(4):78-89.
　ZHANG Peng fei,YIN Zhi huan,CHANG Jun.Fatigue fracture of orthotropic steel deck of cablestayedbridge under complex coupling stress[J].Journal of Chang’an University (Natural Science Edition),2021,41(4):78-89.
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复杂应力耦合作用下斜拉桥正交异性桥面板疲劳断裂()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第41卷
期数:
2021年4期
页码:
78-89
栏目:
桥梁与隧道工程
出版日期:
2021-07-15

文章信息/Info

Title:
Fatigue fracture of orthotropic steel deck of cablestayedbridge under complex coupling stress
作者:
张鹏飞; 殷志欢; 常军
(苏州科技大学 土木工程学院，江苏 苏州 215011）
Author(s):
ZHANG Pengfei;  YIN Zhihuan;  CHANG Jun
(College of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, Jiangsu, China)
关键词:
桥梁工程; 随机车辆荷载; 残余应力; 耦合作用; 疲劳裂纹扩展; 焊接
Keywords:
bridge engineering;  random vehicle load;  residual stress;  coupling effect;  fatigue crack growth;  welding
文献标志码:
A
摘要:
为研究随机车辆荷载与焊接残余应力等复杂应力耦合作用下，斜拉桥主梁正交异性桥面板焊接细节的疲劳断裂性能，以苏通长江大桥为工程背景，在调研统计交通量的基础上，基于MonteCarlo法建立随机车辆荷载模型，分析随机车辆荷载作用下正交异性桥面板焊接细节的力学行为；基于ANSYS有限元软件，建立焊接细节热分析模型，模拟焊接加热过程与冷却过程，获得焊趾附近残余应力分布。将焊接残余应力作为初始应力，采用数值模拟获得随机车辆荷载与焊接残余应力耦合作用下正交异性桥面板焊接细节的疲劳应力谱。基于双参数疲劳裂纹扩展模型，考虑疲劳裂纹扩展裂纹闭合效应，分析随机车辆荷载与焊接残余应力耦合作用下，正交异性桥面板焊接细节疲劳裂纹扩展行为。结果表明：焊接残余应力与随机车辆荷载耦合作用下，焊接细节疲劳应力幅值远大于车辆荷载作用的应力幅值；在随机车辆荷载与焊接残余应力耦合作用下，正交异性桥面板顶板与U肋焊接节点的剩余疲劳寿命随裂纹长度的增大而下降；焊接残余应力的存在极大地降低了焊接节点的疲劳寿命，与仅考虑随机车辆荷载作用下焊接节点的疲劳寿命相比，〖JP2〗焊接残余应力与车辆荷载应力耦合作用下的疲劳寿命下降30%~40%，且疲劳寿命降低幅度随残余应力的增大而增大。
Abstract:
In order to study the fatigue fracture performance of the welding details of the orthotropic steel deck of the main girder of cablestayed bridge, under the coupling of complex stresses such as random vehicle load and welding residual stress, the Sutong Yangtze River Bridge was used as the engineering background, the MonteCarlo method was used to establish random vehicle load model based on the investigation and statistics of traffic volume, the mechanical behavior of the welding details of the orthotropic bridge deck under random vehicle load was analyzed. In the ANSYS finite element software, the thermal analysis model of welding details was established, the welding heating process and cooling process to obtain the residual stress distribution near the weld toe was simulated. The welding residual stress was regard as the initial stress, the fatigue stress spectrum of the welding details of the orthotropic bridge deck under the coupling effect of random vehicle load and welding residual stress was obtained through numerical simulation. Based on the twoparameters fatigue crack growth model, considering the fatigue crack growth and crack closure effect, the fatigue crack growth behavior of the welding details of the orthotropic steel deck under the coupling effect of random vehicle load and welding residual stress were studied and analyzed. The results show that under the coupling effect of welding residual stress and random vehicle load, the fatigue stress amplitude of welding details is much larger than that of vehicle load. Under the coupling effect of random vehicle load and welding residual stress, the remaining fatigue life of the welded joint between the top plate of the orthotropic steel deck and the Urib decreases with the increase of the crack length. The existence of welding residual stress greatly reduces the fatigue life of welded joints. Compared with the fatigue life of welded joints under random vehicle load, the fatigue life of welding residual stress and vehicle load stress is reduced by 30% to 40%, and the fatigue life is increased with the increase of residual stress. 19 figs, 34 refs.

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更新日期/Last Update: 2021-08-12