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首页> 外文期刊>Journal of bridge engineering >Influence of Asphalt Surfacing on Fatigue Evaluation of Rib-to-Deck Joints in Orthotropic Steel Bridge Decks
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Influence of Asphalt Surfacing on Fatigue Evaluation of Rib-to-Deck Joints in Orthotropic Steel Bridge Decks

机译：沥青路面对正交异性钢桥面肋到甲板节点疲劳评估的影响

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摘要

Numerous fatigue cracks were observed recently in orthotropic steel bridge decks that have been in service for a long period of time. A fatigue crack initiating from the rib-to-deck (RD) joint may especially produce asphalt surfacing damage, and hence have an impact on traffic safety. In fatigue evaluation of RD joints, in most current design specifications the asphalt surfacing is just treated as a layer dispersing wheel loads, in which the wheel loads are uniformly distributed on the deck plate and the effect of the composite stiffness of the deck plate and asphalt surfacing is neglected. In this study, comprehensive finite-element and load models were used to investigate the asphalt surfacing influence on the wheel load dispersal and composite stiffness. The analysis result shows that wheel loads are not uniformly distributed on deck plates but are concentrated on the weld joints, the asphalt surfacing could significantly decrease the stress magnitude around the RD joints, and this decrease may mainly result from composite stiffness rather than load dispersal. The effective stresses of RD joints, and their fatigue evaluation indicate that the fatigue life of RD joints could be drastically improved by asphalt surfacing. However, on the other hand, the fatigue life is shortened considerably by the effects of temperature. Moreover, the type of fatigue crack initiating from the weld root may also be influenced by the asphalt surfacing.
机译：最近在长期使用的正交异性钢桥面板中观察到许多疲劳裂纹。从肋骨到甲板（RD）接头引发的疲劳裂纹特别会产生沥青路面损坏，因此对交通安全产生影响。在RD接头的疲劳评估中，在大多数当前设计规范中，沥青堆焊仅被视为分散车轮载荷的层，其中车轮载荷均匀地分布在盖板上，并且盖板和沥青的复合刚度影响堆焊被忽略了。在这项研究中，使用综合有限元和载荷模型来研究沥青路面对车轮载荷分散和复合刚度的影响。分析结果表明，车轮载荷不是均匀地分布在甲板上，而是集中在焊接缝上，沥青堆焊可以显着减小RD缝周围的应力大小，这种减小可能主要是由于复合刚度而不是载荷分散所致。 RD接头的有效应力及其疲劳评估表明，沥青路面可以大大改善RD接头的疲劳寿命。但是，另一方面，由于温度的影响，疲劳寿命大大缩短。而且，从焊接根部开始的疲劳裂纹的类型也可能受到沥青路面的影响。

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