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首先采用空间有限元方法,对长沙市洪山大桥的钢-混凝土组合脊骨主梁中大悬臂钢挑梁间的荷载分布规律进行了计算分析,并探讨了荷载作用位置对挑梁荷载分布的影响,得出钢挑梁荷载分布可以采用3片梁分析模型进行计算的结论;然后提出了考虑挑梁刚度沿其纵向变化和混凝土行车道板受钢箱梁约束程度影响的弹性支承连续梁平面简化算法来分析挑梁间的荷载分布,并将沿横桥向布置的多排车轮荷载用一个等效集中荷载代替。对比分析表明平面简化算法具有较高的精度,简单可行。
Firstly, the spatial distribution of the cantilever steel beam in the steel-concrete composite spine main beam of Changsha Hongshan Bridge was calculated and analyzed by using the spatial finite element method. The influence of load location on the load distribution of the pick-beam was also discussed , The conclusion that the load distribution of steel pick-up beam can be calculated by using 3-beam analysis model is proposed; then, the plane simplification of elastic-supported continuous beam considering the change of the rigidity of pick-up beam along its longitudinal direction and the constraint of the steel box girder Algorithm to analyze the load distribution between the picks, and to replace the multi-row wheel loads arranged in the transverse direction with an equivalent concentrated load. The comparative analysis shows that the plane simplification algorithm has high precision and is simple and feasible.