[1]李传习,李 游,陈卓异,等.基于实测车流的钢箱梁横隔板疲劳特性[J].长安大学学报(自然科学版),2019,39(05):48-58.
 LI Chuan xi,LI You,CHEN Zhuo yi,et al.Fatigue characteristics of steel box girder based on measured vehicle flow[J].Journal of Chang’an University (Natural Science Edition),2019,39(05):48-58.
点击复制

基于实测车流的钢箱梁横隔板疲劳特性()
分享到:

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:
48-58
栏目:
桥梁与隧道工程
出版日期:
2019-09-15

文章信息/Info

Title:
Fatigue characteristics of steel box girder based on measured vehicle flow
作者:
李传习李 游陈卓异贺 君刘一鸣
(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 桥梁工程安全控制教育部重点实验室,湖南 长沙 410114)
Author(s):
LI ChuanxiLI YouCHEN Zhuoyi HE JunLIU Yiming
(1.School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 2. Key Laboratory of Safety Control for Bridge Engineering of the Ministry of Education, Changsha University of Science & Technology, Changsha 410114, Hunan, China)
关键词:
桥梁工程车辆荷载谱模型试验横隔板弧形切口疲劳寿命裂纹扩展
Keywords:
bridge engineering vehicle load spectrum model test arc incision of transverse diaphragm fatigue life crack propagation
文献标志码:
A
摘要:
为研究车流荷载作用下钢箱梁横隔板弧形切口处母材的疲劳特性,以佛山平胜大桥为背景工程,基于动态称重系统(WIM)监测数据,得到了该桥9种车型的疲劳荷载谱,运用ABAQUS建立了钢箱梁节段模型,计算了横隔板弧形切口处疲劳应力时程曲线。通过模型试验验证,得到了设计弧形切口的疲劳寿命和裂纹扩展规律。研究结果表明:该悬索桥疲劳车型可简化为V2~V10共9类,不同车道的同一车型轴重差异较大,3#、4#车道轴重普遍高于1#、2#、5#车道,最大轴重为3#车道的V10车型的Z3轴,重达151 kN;重车道(3#、4#车道)V2~V10车型的比例明显高于其他车道;轮轴作用下弧形切口处沿纵桥向的应力影响线较短,约3个横隔板间距,动力响应始终为压应力,且仅能识别轴组,不能分辨轴组中的单根轴重,当V10车型后轴组通过时,弧形切口的压应力幅达最大,为-169 MPa;考虑车辆超载时,弧形切口处的最小和最大疲劳应力幅分别为不考虑车辆超载时的1.17倍、1.75倍;模型试件在膜压应力幅作用下弧形切口处母材出现疲劳裂纹,开裂位置与实桥一致,均萌生于横隔板弧形切口处起弧点附近,裂纹长度达53 mm;裂纹扩展前期速率较快,后期逐渐减慢;轮载横向作用位置对弧形切口处应力幅影响很大,轮载作用于弧形切口正上方时,该位置应力幅最大。
Abstract:
To study the fatigue properties of the base material at the arc incision of a steel box girder under traffic load, Foshan Pingsheng Bridge was used for the engineering background, and based on the monitoring data of the weighinmotion (WIM) system, the fatigue load spectrum of nine vehicle types of the bridge was obtained. A steel box girder segment model was established using ABAQUS, and the fatigue stress history curve of the arc incision of the transverse diaphragm was calculated. Validated by model tests, the fatigue life and crack propagation law of the design arc incision was obtained. The results show that the fatigue model of the suspension bridge can be simplified to V2 to V10, the axle weights of the same model vary in different lanes, the axle weights of lanes 3# and 4# are generally higher than lanes 1#, 2#, 5#, and the Z3 axis of the V10 model in lane 3# has a maximum axle weight of 151 kN. The proportions of V2 to V10 models in heavy traffic lanes (lanes 3# and 4# ) are significantly higher than in other lanes. The influence lines along the longitudinal bridge at the arc incision under the axles are shorter, about the spacing of the three diaphragms. The dynamic response is always compressive, and only the axis group can be identified. The weight of a single axle in the axis group cannot be distinguished when the rear axle group of the V10 model passes, and the compressive stress amplitude of the arc incision slit reaches a maximum of -169 MPa. When considering the vehicle overload, the minimum and maximum fatigue stress amplitudes at the arc incision are 1.17 and 1.75 times of that without vehicle overload, respectively. Under the action of the film compressive stress amplitude, the fatigue crack occurred in the base material at the arc incision of the model test piece, and the cracking position is consistent with the real bridge, and cracks both appeared near the arcing point of the arc incision of the diaphragm, and the length of the crack was 53 mm. The rate of crack propagation is faster in the early stage and gradually slowing down in the later stage. The lateral position of the wheel load has a significant influence on the stress amplitude at the arc incision. When the wheel load acts directly above the arc incision, the stress amplitude at this position is the largest. 3 tabs, 14 figs, 33 refs.

相似文献/References:

[1]李宇,朱晞,杨庆山,等.高墩大跨桥梁结构的脆弱性分析[J].长安大学学报(自然科学版),2012,32(01):0.
[2]高亮,刘健新,张丹,等.桁架桥主梁三分力系数试验[J].长安大学学报(自然科学版),2012,32(01):0.
[3]刘旭政,王丰平,黄平明,等.斜拉桥各构件校验系数的常值范围[J].长安大学学报(自然科学版),2012,32(01):0.
[4]尚维波,张春宁.高墩刚构桥系梁抗震分析[J].长安大学学报(自然科学版),2012,32(01):0.
[5]邬晓光,李冀弘,宋伟伟.基于改进响应面法的在役PC桥梁承载力可靠性[J].长安大学学报(自然科学版),2012,32(03):53.
 WU Xiao-guang,LI Ji-hong,SONG Wei-wei.Reliability of existing PC bridge based on improved response surface method[J].Journal of Chang’an University (Natural Science Edition),2012,32(05):53.
[6]石雄伟,袁卓亚,马毓泉,等.钢板-混凝土组合加固预应力混凝土箱梁[J].长安大学学报(自然科学版),2012,32(03):58.
 SHI Xiong-wei,YUAN Zhuo-ya,MA Yu-quan,et al.Prestressed concrete box girder strengthened with comsposition of steel plate and concrete[J].Journal of Chang’an University (Natural Science Edition),2012,32(05):58.
[7]李传习,陶 伟,董创文.斜交墩截面刚度与弯曲正应力[J].长安大学学报(自然科学版),2012,32(03):63.
 LI Chuan-xi,TAO Wei,DONG Chuang-wen.Sectional stiffness and bending normal stress of oblique pier[J].Journal of Chang’an University (Natural Science Edition),2012,32(05):63.
[8]邓继华,邵旭东.带铰平面梁元几何非线性有限元分析[J].长安大学学报(自然科学版),2012,32(03):68.
 DENG Ji-hua,SHAO Xu-dong.Geometric nonlinear finite element analysis of plane beam element with hinge[J].Journal of Chang’an University (Natural Science Edition),2012,32(05):68.
[9]蒲广宁,赵 煜,宋一凡.减梁增肋法加固空心板桥的力学性能[J].长安大学学报(自然科学版),2012,32(06):38.
 PU Guang-ning,ZHAO Yu,SONG Yi-fan.Mechanical properties of strengthening hollow slab bridge based on beam-reduction and rib-addition method[J].Journal of Chang’an University (Natural Science Edition),2012,32(05):38.
[10]党 栋,贺拴海,周勇军,等.基于车辆统计数据的汽车荷载标准值取值与评估[J].长安大学学报(自然科学版),2012,32(06):44.
 DANG Dong,HE Shuan-hai,ZHOU Yong-jun,et al.Choosing and assessment for the standard of vehicle load based on vehicle statistical data[J].Journal of Chang’an University (Natural Science Edition),2012,32(05):44.
[11]黄华,刘伯权,刘鸣,等.车辆荷载谱作用下简支T梁力学性能[J].长安大学学报(自然科学版),2007,27(02):58.
 HUANG Hua,LIU Bo-quan,LIU Ming.Mechanics performance of simple supported T-beam under vehicle load spectrum[J].Journal of Chang’an University (Natural Science Edition),2007,27(05):58.

更新日期/Last Update: 2019-10-16