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为明确锚箱式索梁锚固区的应力分布和索力传递规律,选取合理的分析区段,运用有限元分析软件Ansys建立索梁锚固区空间有限元模型,对钢锚箱、钢箱梁腹板以及腹板附近的主梁单元进行局部细化计算。计算结果表明:钢锚箱各构件的弯曲应力、剪应力均符合规范要求,最大应力为承压板N3的横桥向压应力;腹板有少许的面外变形,在钢锚箱下部区域处应力最大,从该位置向四周应力逐渐减小,应力传递流畅;腹板和承压板之间的焊缝均出现了应力集中。由此,设计时必须考虑锚箱下部处腹板加劲肋的设计,同时施工时必须保证焊缝的施工质量。
In order to clarify the stress distribution and the cable force transmission law in the anchorage zone of anchorage cable girder, a reasonable analysis section was selected. The finite element analysis software Ansys was used to establish the space finite element model of cable anchorage zone. Plate and the web near the beam unit for local refinement calculation. The calculation results show that the bending stress and shear stress of each component of steel anchor box meet the requirements of the code, and the maximum stress is transverse compressive stress of bearing plate N3. The web has a little out-of-plane deformation, The stress is the largest, from this position to the surrounding stress decreases gradually, the stress transfer fluent; web and bearing plate between the stress concentration occurred. Therefore, the design must consider the design of web stiffeners at the lower part of anchor box, and the construction quality of the weld must be ensured at the same time.