三叶玫瑰线形桥面构造的人行景观悬索桥设计

Design of Pedestrian Landscape Suspension Bridge with Three-leaf Rose Shaped Bridge Deck

针对三岔形河流峡谷地形,需修建超大跨径的三岔形人行景观桥梁,一桥连通三岸。文中提出一种三叶玫瑰线形桥面构造的人行景观悬索桥,三岔形缆索体系悬挂在三角形布置的三个双肢柱门式桥塔之上,吊索体系悬挂三叶玫瑰线形桥面系加劲梁,结构轻盈。结合实际工程,进行几何构形研究,建立midas有限元计算模型,进行静力分析和动力模态分析研究,分析表明,三岔形缆索体系与三叶玫瑰线形桥面加劲梁均为稳定的三角形结构形式,具有良好的空间刚度,可避免人行悬索桥左右摇晃问题,抗风稳定性良好。

In view of the terrain of bifurcated river canyon,it is necessary to build a large span bifurcated pedestrian landscape bridge,with one bridge connecting the three banks.A pedestrian landscape suspension bridge with trefoil rose shaped bridge deck is proposed.The trefoil cable system is suspended on three double-leg portal pylons with triangular arrangement,and the suspension system is suspended on the trefoil rose shaped bridge deck system stiffening beam,with light structure.Combined with the actual project,the geometric configuration research is carried out,the midas finite element calculation model is established,and the static analysis and dynamic modal analysis are carried out.The analysis shows that both the bifurcated cable system and the trefoil rosette deck stiffening beam are stable triangular structures with good spatial stiffness,which can avoid the left and right sway of the pedestrian suspension bridge with good wind stability.