曲线钢箱梁主梁应力不均匀性研究

STUDY ON THE UNEVENNESS OF STRESS DISTRIBUTION OF CURVED STEEL BOX-GIRDER

结合某两跨曲线连续钢箱梁桥,采用有限元方法建立了全桥板壳模型,并计算得出钢箱梁桥在不同荷载作用下的应力。研究连续钢箱梁桥顶、底板应力分布不均的原因及规律。最后,提出应力分布不均匀系数概念,并给出了支座处和跨中应力分布不均匀系数的建议值。对今后同类连续钢箱桥的结构设计有一定的参考价值。

With regard to a two-span continuous curved bridge with steel box girder, finite element analysis model was established by using shell elements, and the stress of steel box girder was computed under different loading conditions. The reason that results in unevenness of stress distribution at both top and bottom slab of curved steel box girder was studied through analysis, and the pattern of stress unevenness was also obtained in this paper. In the end, the unevenness coefficient of stress distribution at both support and mid-span of curved box-girder bridge was defined and a reasonable value was proposed, which may provide a reference for the design of similar bridge structures.