东南大学学报（自然科学版）2025，Vol.55Issue(1)：66-77,12.DOI:10.3969/j.issn.1001-0505.2025.01.008
斜拉桥钢桥面板挖孔细节群的数字畸变疲劳试验
Digital distortion-induced fatigue tests on diaphragm cutout detail group in steel bridge decks of cable-stayed bridges
摘要
Abstract
To investigate the distortion-induced fatigue mechanism of the diaphragm cutout detail group in steel bridge deck of cable-stayed bridge,a cable-stayed bridge full-scale digital fatigue twin model was estab-lished,considering the multi-field coupling effects of fatigue stress,welding residual stress and welding de-fects.This model enabled the digital test and simulation of distortion-induced fatigue in steel bridge deck typi-cal detail groups.During the welding digital twin simulation,the simulation accuracy of the welding tempera-ture field and residual stress field were significantly improved using thermal convection parameters related to element temperature.The digital distortion-induced fatigue test and simulation results show that the equivalent stress intensity factor amplitude at the distortion-induced fatigue crack tips are greater than the threshold,mak-ing the initial cracks at the detail group more likely to grow under the load of operating trucks.The results of strain energy release rate analysis show the distortion-induced fatigue cracks at the diaphragm cutout detail group are all mixed-mode cracks of Modes Ⅰ,Ⅱ,and Ⅲ led by Mode Ⅰ.The coupling characteristics of the three modes cracks are significant during the whole propagation process.The research results can provide the basis for the anti-fatigue design and maintenance of the steel bridge deck in cable-stayed bridges.关键词
桥梁工程/斜拉桥/钢桥面板/畸变疲劳/数字疲劳试验/复合型裂纹/累积应变能释放率Key words
bridge engineering/cable-stayed bridge/steel bridge deck/distortion-induced fatigue/digital fa-tigue test/mixed mode crack/cumulative strain energy release rate分类
交通工程引用本文复制引用
王春生,许璐巍,李璞玉..斜拉桥钢桥面板挖孔细节群的数字畸变疲劳试验[J].东南大学学报（自然科学版）,2025,55(1):66-77,12.基金项目
国家自然科学基金资助项目(51578073) （51578073）
长安大学中央高校基本科研业务费专项资金资助项目(300102214904). （300102214904）
