【摘要】 贵黔高速鸭池河特大桥为主跨800m的钢桁-混凝土混合梁斜拉桥,边跨预应力混凝土梁采用挂篮悬臂浇筑施工,主跨钢桁梁采用缆索吊机整节段悬臂拼装。为指导施工,使成桥后的结构线形和内力满足设计要求,采用TDV RM软件建立全桥有限元模型,在施工过程中对桥塔、预应力混凝土梁、钢桁梁的线形和应力及斜拉索索力等进行监控。结果表明:施工过程中结构线形和应力的实测值与理论值均吻合较好,成桥后主梁线形平顺、索力均匀;桥塔线形误差控制在±4cm以内,边跨混凝土梁和中跨钢桁梁标高误差分别控制在±1.1cm、±5cm以内,斜拉索索力误差在±10%以内,均满足设计要求。更多还原

【Abstract】 Yachi River Bridge is a cable-stayed bridge with steel truss-concrete composite girders and a main span of 800 m.The prestressed concrete girders for side spans are cast by cantilevered method,and the segments of steel truss girders for the main span are assembled by cable crane.To guide the bridge construction and to meet the requirements of the desired alignments and internal forces after completion,a finite element model is established by the software TDV RM,and the alignments and stresses of pylons,concrete girders,steel truss girder,and cable forces,etc.are timely surveyed during construction stages.The results reveal that the field surveys match well with theoretical values,and the alignment and the cable forces of girder are distributed evenly after completion.The alignment deviations of pylon are controlled within ±4 cm;the elevation deviations of concrete girders for side span and steel truss girder for middle span are smaller than ±1.1 cm and ±5 cm,respectively.The cable force deviations between the field and expected ones are less than ±10%.Therefore,the construction errors of Yachi River Bridge meet the design requirements.更多还原