中文摘要：

采用有限元方法,分析研究全桥效应对正交异性钢桥面受力特性的影响,提出并建立了全桥模型和钢桥面局部节段模型,通过对关注截面的位移和应力控制,确保节段计算模型合理,研究了正交异性钢桥面易出现疲劳裂纹位置的应力和全桥效应.研究结果表明：钢桥面疲劳验算的控制应力可分为纵肋纵向应力和其他局部应力,局部应力受全桥效应影响很小,应力计算可不计全桥效应;纵肋纵向应力受全桥效应影响明显,但纵肋纵向应力幅受全桥效应影响很小,节段模型可直接用于正交异性钢桥面疲劳验算,提出了适合于钢桁梁桥疲劳验算的有效节段计算模型.

英文摘要：

The whole and segment finite element models of orthotropic steel decks were developed to investigate the stress distribution in critical areas that are prone to fatigue cracks.The finite element model of a bridge segment was certified by comparing the displacement and stress in the control sections with those derived from the whole bridge model.The results demonstrate that the control stresses in the fatigue calculation regions were dominated by the local stresses except for the longitudinal stress of the U-rib that was obviously influenced by the bridge global responses.Compared with the longitudinal stress,the stress range of the U-rib was rarely affected by the bridge global responses.The segment model was verified and it was proposed for fatigue assessment of orthotropic steel decks.