螺溪洲大桥方案设计

Design of Luoxizhou Bridge Scheme

螺溪洲大桥是一座跨越江西赣江的大型钢桁架景观桥梁,主桥采用跨径布置为(40+70+140+70+40)m的开口式钢桁架结构,中跨上弦杆曲线为二次抛物线,边跨上弦杆为斜直线,上弦无横联或平联。桥梁造型如一座座山峰,层峦叠嶂,结构新颖独特,形成良好的稳定与均衡效果。钢桁架桥梁主体为栓焊结构,采用整体式节点设计,上下弦杆采用箱形截面,桥面系采用正交异性钢桥面结构。常规的钢桁架桥梁存在较多的横联及平联,严重影响桥梁的通透性及景观效果,螺溪洲大桥的开口式钢桁架结构能为此类桥梁设计提供有益参考。

Luoxizhou Bridge is a large steel truss landscape bridge across Gan River in Jiangxi. The main bridge adopts an open steel truss structure with span arrangement of(40 + 70 + 140 + 70 + 40) m. The upper chord curve of the middle span is a quadratic parabola;the upper chord curve of mid span is quadratic parabola, while the upper chord curve of side span is oblique straight line, and the upper chord has no transverse or parallel connection. The shape of the bridge is like hills & mountains, with novel & unique structure and good stability & balance effect. The main body of steel truss bridge is bolt-welded structure, which adopts integral joint design, box section for upper & lower chords, and orthotropic steel deck structure for deck system. Conventional steel truss bridges have more horizontal & lateral connections, which seriously affect the permeability & landscape effect of bridges. The open steel truss structure of Luoxizhou Bridge can provide useful reference for the design of such bridges.