王春生, 翟慕赛, HouankpoT O N. 正交异性钢桥面板典型细节疲劳强度研究[J]. 工程力学, 2020, 37(8): 102-111. DOI: 10.6052/j.issn.1000-4750.2019.09.0518
引用本文: 王春生, 翟慕赛, HouankpoT O N. 正交异性钢桥面板典型细节疲劳强度研究[J]. 工程力学, 2020, 37(8): 102-111. DOI: 10.6052/j.issn.1000-4750.2019.09.0518
WANG Chun-sheng, ZHAI Mu-sai, HOUANKPO T O N. FATIGUE STRENGTH OF TYPICAL DETAILS IN ORTHOTROPIC STEEL BRIDGE DECK[J]. Engineering Mechanics, 2020, 37(8): 102-111. DOI: 10.6052/j.issn.1000-4750.2019.09.0518
Citation: WANG Chun-sheng, ZHAI Mu-sai, HOUANKPO T O N. FATIGUE STRENGTH OF TYPICAL DETAILS IN ORTHOTROPIC STEEL BRIDGE DECK[J]. Engineering Mechanics, 2020, 37(8): 102-111. DOI: 10.6052/j.issn.1000-4750.2019.09.0518

正交异性钢桥面板典型细节疲劳强度研究

FATIGUE STRENGTH OF TYPICAL DETAILS IN ORTHOTROPIC STEEL BRIDGE DECK

  • 摘要: 为合理确定正交异性钢桥面板疲劳强度,该文对国内外疲劳试验成果进行分析,确定有效的钢桥面板疲劳试验数据,结合典型细节疲劳开裂机理,提出适应于中国抗疲劳设计与建造水平的钢桥面板疲劳强度等级(200万次循环对应的疲劳强度)。研究结果表明:顶板与纵肋连接细节疲劳强度受焊缝型式影响较大,采用角焊缝连接时疲劳强度为50级,采用部分熔透焊缝连接时为60级;纵肋与横隔板连接细节横隔板焊趾处疲劳强度为70级,纵肋腹板焊趾处为55级;横隔板挖孔细节疲劳强度为70级;纵肋拼接细节疲劳强度与拼装间隙密切相关,拼装间隙小于3 mm时疲劳强度为40级,拼装间隙4 mm~6 mm时疲劳强度为70级,拼装间隙8 mm~12 mm时疲劳强度为100级。纵肋与横隔板连接细节横隔板焊趾处、横隔板挖孔细节和纵肋拼接细节疲劳强度与现行中国JTG D64规范一致,而顶板与纵肋连接细节、纵肋与横隔板连接细节纵肋腹板焊趾处疲劳强度低于JTG D64中的疲劳强度等级。在进行正交异性钢桥面板抗疲劳设计或疲劳评估时,应综合考虑细节构造、制造质量以及实际使用状况等因素,采用合理的疲劳强度等级。

     

    Abstract: In order to reasonably determine the fatigue strength of an orthotropic steel bridge deck, the fatigue test achievements at home and abroad are analyzed, and the effective fatigue test data is selected. Combined with fatigue cracking mechanism of typical details, fatigue strength categories (fatigue strength corresponding to 2 million cycles) for orthotropic steel bridge deck are proposed, which adapts to the anti-fatigue design and construction level of China. Research results show that: the fatigue strength of deck-to-rib detail is greatly influenced by the weld type, which belongs to Category 50 for fillet weld and Category 60 for partial penetration weld; for the rib-to-diaphragm detail, the fatigue strength of the welded toe of the diaphragm is Category 70, and that of the longitudinal rib web is Category 55; the fatigue strength of diaphragm cutout detail belongs to Category 70; the fatigue strength of rib-to-rib detail is closely relevant to the splice gap, which indicates that Category 40 is suitable for the splice gap less than 3 mm, Category 70 is suitable for the splice gap between 4 mm and 6 mm, and Category 100 is suitable for the splice gap between 8 mm and 12 mm. The fatigue strength of diaphragm weld toe in rib-to-diaphragm detail, of diaphragm cutout detail and of rib-to-rib detail is consistent with the categories in current JTG D64 specification of China. The fatigue strength of deck-to-rib detail and of rib wall weld toe in rib-to-diaphragm detail is lower than that of the categories in JTG D64 specification. When performing the anti-fatigue design or the fatigue assessment for orthotropic steel bridge decks, reasonable fatigue strength categories should be determined by the comprehensive factors of the detail structure, manufacture quality, actual service state and others.

     

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