太原市南中环汾河桥主桥设计

Design of Taiyuan South-Mid-Ring Fen River Bridge

太原市南中环汾河桥是跨越汾河连接太原市东西城区的重要桥梁。主桥为60 m+180 m+60 m下承式连续拱梁组合体系结构,拱肋由主拱和副拱形成月亮造型,通过斜拉杆将两个向外倾斜的月亮造型拱肋连为一体,主吊杆、斜吊杆、斜拉杆形成六索面吊索体系,加劲梁中跨92 m部分为钢混凝土叠合梁,其余为预应力混凝土箱梁,拱肋的恒载水平力由系杆索平衡。本桥结构独特、外型优美,尤其是中央斜拉杆的设置,既是受力的需要,又丰富了建筑造型。本文介绍桥型构思、方案比选以及主桥的总体设计。

South-mid-ring Fen River Bridge is an important urban bridge on south-mid-ring of TaiYuan city over Fen River. The main bridge was designed as arch-beam composite bridge with the spans arranged as （60 ＋180 ＋60）m. The main arch and the assistant arch make up the architectural shape of the ＂moon＂, the inclined hanger ties them together. The main hanger,assistant hanger and the inclined hanger make up a six- arch-plane structure. The middle span of 92 m is steel-concrete composite beam and the other part is pre-stress concrete beam. The horizontal force is banlanced by the tied cable. The structure is unique and the architectural shape is beautiful, the inclined hanger is not only a structure component but also an architectural shape-maker. In this paper, the design considerations of bridge style, the design alternative comparison and overall design of the main bridge are presented.