李萨如曲线拱肋的斜拉飞燕拱人行景观桥设计

针对超大跨径的曲线形人行景观桥的需求,提出一种双幅曲线形桥面的李萨如曲线拱肋飞燕式斜拉拱桥,其平面正投影为李萨如曲线图形,拱肋侧立面为飞燕式斜拉拱造型,钢管混凝土飞燕式斜拉拱肋上安装下部拱脚拉索和拱肋间上部空间缆索,形成自平衡结构体系,浮运拖拉过河,安装主拱吊索和尾部斜拉缆索,悬吊双幅曲线形桥面和中央圆环形观光平台,多组空间缆索协同工作,优势互补。结合实际工程,进行参数设计,建立MIDAS有限元模型,进行内力计算、动力模态分析和稳定性分析研究,验证其结构性能的合理性。

Design of Cable-Stayed and Flying-bird Arch Pedestrian Landscape Bridge with Lissajous Curved Arch Rib

In response to the demand for super large-span curved pedestrian landscape bridge,one kind of flying-bird cable-stayed arch bridge with Lissajous curved arch rib and double curved deck was proposed.The plane orthographic projection of the bridge is Lissajous curve figure,and the side elevation of arch rib is flyingbird cable-stayed arch.The lower arch foot cables and the upper spatial cables between the arch ribs were installed on the concrete-filled steel tube flying-bird cable-stayed arch rib to form a self-balanced structural system which was dragged across the river by floating.The main arch slings and tail cables were installed,and the double curved deck and the central circular sightseeing platform were suspended.Multiple groups of spatial cables work together to complement each other.Combined with the actual project,the parameters were designed and the MIDAS finite element model was established.The internal force calculation,dynamic modal analysis and stability analysis were carried out to verify the rationality of the structural performance.