安庆长江公路大桥主桥方案比选

Comparison and Selection of Main Bridge Scheme of Anqing Changjiang River Highway Bridge

该文介绍了安庆长江公路大桥主桥的方案构思和方案设计,提出了四种适合该桥建设条件的桥型方案,为选择主桥方案奠定基础。重点对主跨为495～520m范围内的斜拉桥方案的难点及特点进行分析研究,分别为:第一桥型方案,主桥为扁平箱梁断面预应力混凝土斜拉桥;第二桥型方案,主桥为梁板式断面预应力混凝土斜拉桥;第三桥型方案,主桥为全焊扁平流线形封闭钢箱梁斜拉桥;第四桥型方案,主桥采用五跨叠合梁斜拉桥。经过充分比较和论证后,最终确定主跨为510m全焊扁平流线形封闭钢箱梁斜拉桥。

This paper introduces the scheme conception and the scheme design of the main bridge for Anqing Changjiang River Highway Bridge,and puts forward four bridge schemes suitable for the construction condition of this bridge so as to establish the basis for selecting the scheme of the main bridge.The paper focuses analysis and study on the difficulty and characteristic of the cable-stayed bridge scheme for the main bridge within the range of 495~520 m.The first bridge scheme is the pre-stressed concrete cable-stayed bridge with flat box girder cross-section for the main bridge,the second scheme is the pre-stressed concrete cable-stayed bridge with beam-slab cross-section for the main bridge,the third scheme is the full welded flat streamlined closed steel box beam cable-stayed bridge for the main bridge,and the fourth scheme is the 5-span composite beam cable-stayed bridge for the main bridge.After the full comparison and demonstration,the main bridge is 510-m full-welded flat streamlined closed steel box beam cable-stayed bridge is finally determined.