2×36m连续箱梁桥主梁设计及纵向计算

Design and Longitudinal Calculation of Main Girder for Two-span 36-m Continuous Box Girder Bridge

两跨连续梁桥在实际桥梁工程项目中,采用的概率相对较小,其经济指标相对于多跨连续梁桥要低一些。以舟山市小干二桥工程引桥中间某联2×36 m预应力混凝土连续箱梁桥为背景,从主梁设计准则、主梁构造尺寸拟定、主梁钢束配置及纵向计算等方面,对其主梁设计及纵向计算进行深入介绍,可为类似工程项目提供有益的参考。

The adoptive probability of two-span continuous girder bridge is relatively smaller in the practical bridge engineering construction. Its economical indexes are lower than the multi-span continuous girder bridges. According to the background of a two-span 36-m pre-stressed concrete continuous box girder bridge in the approach bridge of Zhoushan Xiaogan Bridge II Project, the article introduces the design and longitudinal calculation of its main girder from the design criteria of main girder, the proposal of main girder structure size, the steel strand configuration of main girder and the longitudinal calculation in detail, which can be referred for the similar projects.