悬索形敞开式钢桁架桥K型节点设计及研究

Design and Research on K-shaped Nodes of Suspension Open Steel Truss Bridges

悬索形钢桁架桥以其形如山峦、美观独特的结构形式和主梁高度低的特点,在景观桥梁及大跨度桥梁中尤受青睐。尤其是无平联的敞开式K型桁架,作为一种“崭新”的桥梁结构形式,简洁通透、美观经济,在城市桥梁中具有较强的竞争力。螺溪洲大桥是国内跨度第一的悬索形敞开式景观钢桁架桥,以其为例,对大跨径悬索形敞开式K型钢桁架桥梁的整体结构性能、构造细节、K型节点受力特性进行研究和分析,为我国今后类似桥梁建设提供实践经验。

Suspension steel truss bridges are particularly favored in landscape bridges and large-span bridges due to their unique and aesthetically pleasing structural form,as well as their low height of main beam.Especially the open K-shaped truss without horizontal connections as a"new"form of bridge structure,is simple,transparent,beautiful and economical,and has strong competitiveness in urban bridges.The Luoxizhou Bridge is the largest cable-stayed open type landscape steel truss bridge in China.Taking it as an example,this paper studies and analyzes the overall structural performance,structural details,and K-shaped node stress characteristics of a large-span cable-stayed open type K-shaped steel truss bridge,which provides practical experience for similar bridge construction in China in the future.