李岩1,杨婷婷1,商贺嵩2,秦丽辉3.考虑多因素影响的装配式梁桥 横向联系疲劳损伤评估[J].湖南大学学报:自然科学版,2019,(9):79~88
考虑多因素影响的装配式梁桥 横向联系疲劳损伤评估
Fatigue Assessment for Lateral Connection of Fabricated Girder Bridge Considering Multi Factors Influence
  
DOI:
中文关键词:  疲劳损伤评估  混凝土桥梁  横向联系  车桥耦合振动  桥面退化
英文关键词:fatigue damage evaluation  concrete bridges  lateral connection  vehicle-bridge coupled vibration  progressive deterioration of bridge deck
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作者单位
李岩1,杨婷婷1,商贺嵩2,秦丽辉3 (1. 哈尔滨工业大学 交通科学与工程学院黑龙江 哈尔滨 150090 2. 河北省交通规划设计院河北 石家庄 050011 3. 东北农业大学 水利与建筑学院黑龙江 哈尔滨 150030) 
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中文摘要:
      为探讨实际运营条件下各因素对装配式混凝土梁桥横向联系结构疲劳损伤的影响,基于线性Miner累积损伤准则提出了该类桥型横隔梁钢板连接构造的疲劳评估方法和框架. 依托工程实例,研究了随机交通的动力冲击效应、运行状态和桥面退化等因素对横向联系疲劳损伤的影响规律. 结果表明:相对于按照95%保证率考虑随机车载冲击效应的影响,依照规范给定的冲击系数考虑冲击效应会明显低估构件的实际疲劳寿命;车辆运行状态对疲劳损伤影响显著,其他因素相同情况下,密集运行状态造成的疲劳累积损伤值较一般运行状态时小;桥面退化对横隔梁疲劳损伤影响明显,可造成车辆一般和密集运行状态下的结构疲劳寿命降低60.01%和34.88%. 对新桥横向联系设计,建议考虑规范冲击系数和车辆一般运行状态进行疲劳验算;对既有桥梁疲劳评估,建议按实际交通状况考虑随机车辆冲击效应、车流运行状态和桥面退化的影响.
英文摘要:
      To study the effect of actual operational condition on the fatigue damage of lateral connection structure for fabricated concrete girder bridges, a fatigue damage assessment framework for the steel plate connection structure of this bridge type was presented based on linear Miner cumulative damage criterion. The influence rules of dynamic impact effects from stochastic traffic, traffic condition and progressive deterioration of bridge deck roughness on the fatigue damage of lateral connections were studied through an actual bridge example. The results show that the fatigue life of the transversal beam is obviously underestimated when considering the vehicular impact effect under Chinese specification compared with that of stochastic traffic with 95% confidence level. Traffic condition also has a significant influence on the fatigue damage, and the structural fatigue cumulative damage under intensive traffic condition is smaller than that of general one. Progressive deterioration of bridge deck condition has an obvious effect on the fatigue damage. The fatigue life of lateral connection decreased by 60.01% and 34.88% under general and intensive traffic conditions considering bridge deck degradation. When designing a new bridge, the impact factors from specification and general traffic condition should be considered in the fatigue calculation for lateral connection structure. It is suggested that considering the influence of stochastic traffic dynamic impact,operation traffic status and progressive deterioration of bridge deck was necessary when evaluating lateral connection fatigue damage for the existing bridges.
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