超大跨径人行景观曲线形斜拉桥设计

Design of Super Long-span Pedestrian Landscape Cable-stayed Bridge with Curved Deck

超大跨径曲线形斜拉桥结构复杂,曲线主梁同时承受弯矩、剪力和扭矩的复合作用,弯扭耦合作用效应明显。采用单叶双曲面状桥塔塔身、碗状薄壁壳体裙房和圆环形观光平台板三者构成超大跨径曲线形斜拉桥的组合桥塔结构体系,景区观光塔楼和斜拉桥塔二合一,观光塔楼式桥塔提高了超大跨径人行景观曲线形斜拉桥的竖向刚度,碗状薄壁壳体裙房可有效限制曲线形斜拉桥的桥面扭转变形。结合2×150 m曲线形斜拉桥,建立MIDAS有限元模型,验证观光桥塔的超大跨径人行景观曲线形斜拉桥的设计合理性。

The structure of super long-span curved cable-stayed bridge is complex.The curved girder must bear the combined action of bending moment,shear force and torque at the same time,and the coupling effect of bending and torsion is obvious.The combined bridge tower structure system of super long-span curved cable-stayed bridge is composed of univalent hyperboloid bridge tower body,bowl shaped thin-walled shell podium and circular sightseeing platform plate.The sightseeing tower and cable-stayed bridge tower in the scenic spot are combined.The sightseeing tower type bridge tower improves the vertical stiffness of super long-span pedestrian landscape curved cable-stayed bridge,bowl shaped thin-walled shell podium can effectively limit the torsional deformation of the deck of curved cable-stayed bridge.Combined with the 2×150 m curved cable-stayed bridge,MIDAS finite element model is established to verify the scientific rationality of the super long-span pedestrian landscape curved cable-stayed bridge with sightseeing bridge tower.