Abstract: Combining?with?the?engineering?case?study,?a?spatial?simulation?method?based?on?FEM?is?introduced?to?analyze?the?wheel?load?of?bridge?deck?in?the?large-span?continuous?bridge?with?composite?boxgirder.?The?results?of?the?analysis?are?compared?with?those?got?by?the?simplified?methods?in?relative?literature?review.?The?comparison?shows?that?the?results?got?by?simplified?methods?are?higher?than?those?got?by?FEM?in?general.?For?the?moments?in?the?middle?span?of?bridge?deck,?the?result?of?simply-supported?plate?model?got?by?simplified?method?is?over?29%?higher?than?that?got?by?FEM?;the?result?of?continuous?plate?model?got?by?simplified?method?is?over?15%?higher?than?that?got?by?FEM.?For?the?moments?at?the?supporting?point?of?the?plate,?the?result?is?over?51%?higher?than?the?result?got?by?FEM,?for?the?simplified?method?takes?no?consideration?of?the?re-distribution?of?internal?forces.?The?continuous?plate?model?is?recommended?to?estimate?the?moments?in?the?middle?span?of?bridge?deck?ureter?the?wheel?load?at?the?first?stage?of?design.

Key words: continuous beam bridge , composite box girder , bridge deck , finite element method , simplified method

摘要： 结合工程实例,介绍了大跨连续组合箱梁桥面板在汽车轮载作用下的空间有限元仿真分析方法,并将分析结 果与相关文献的简化方法计算结果进行了对比。结果表明:简化方法结果较有限元结果整体偏高。对于桥面板块 跨中弯矩,简支板模型偏高29%以上,连续板模型偏高15%以上;对于板块支点处弯矩,连续板模型由于没有考虑 内力的重分布,计算结果偏高51%以上。初步设计阶段建议采用连续板模型估算轮载作用下桥面板板块跨中弯 矩。

关键词: 连续梁桥, 组合箱梁, 桥面板, 有限元法, 简化方法