大吨位T构桥水平转体关键部位力学特性分析

Analysis on Mechanical Characteristics of Key Parts of Large-tonnage T-frame Swivel Bridge

为研究大吨位T构转体桥梁的各关键部位受力特性,以S43呼和浩特机场高速公路什不更互通上跨唐包铁路立交工程为依托,建立大吨位转体桥整体和局部有限元模型,研究了T构桥上下部关键部位在不同受力条件下的力学特征。结果表明:在承载能力极限状态及正常使用极限状态下,箱梁的内力和变形均满足要求;在地震作用下,桥墩和桩基依然保持在弹性服役状态;在水平转体施工阶段,混凝土最大拉、压应力以及预应力钢筋的应力均在容许应力范围之内。

To study the stress characteristics of key parts of large-tonnage T-frame swivel bridge,the overall and local finite element models of large-tonnage swivel bridge were established based on the S43 Hohhot Airport Expressway Shibugeng Inter-change Trans-Tangbao Railway Interchange Project.The mechanical characteristics of the upper and lower key parts of the T-frame bridge under different stress conditions were studied with the models.The results show that the internal force and deformation of the box girder meet the requirements under the ultimate state of bearing capacity and the ultimate state of serviceability.Under the load of seismic,the bridge pier and pile foundation are still in the elastic service state.In the horizontal rotating construction stage,the maximum concrete tensile and compressive stress,and stress of the prestressed steel bar are within the allowable stress range.