横琴二桥引桥长悬臂板计算与分析

The Calculation and Analysis of the Long-Cantilever Slabs of the Approach of the Second Bridge at Hengqin

珠海横琴二桥南引桥采用大挑臂展翅箱梁,纵向设横隔梁,间距4m,悬臂板长度达7.2m。采用MI-DAS FEA建立三维空间实体模型,并在实体中模拟横向预应力钢筋,通过最不利布载,计算了箱梁横向应力分布及悬臂端部的挠度。结果表明,悬臂板及横隔板受力能够满足规范要求。计算方法和计算结果为同类结构提供了参考。

The southern approach of the second bridge at Hengqin of Zhuhai uses long-cantilever box girders with lateral spacing slabs longitudinally provided.The distance between two lateral spacing slabs is 4 m,and the length of the cantilever slab is 7.2 m.A 3-dimension solid model is established in the light of the MIDAS FEA finite element program,and the transverse pre-stress is simulated with the solid model.The transverse stress and the deflection at the end of the cantilever slab in the most unfavorable loading condition are calculated.The calculated results show that the stress of the cantilever slab and the cantilever slabs can meet the requirements of the norm.The calculation method and the conclusion may serve as a useful reference for structures of similar types.