鱼腹式宽箱梁横梁计算方法研究

Research on calculation method for transverse beam of fish-belly box girder

鱼腹式宽箱梁以其优美的结构外形广泛应用于城市高架桥,而作为重要受力构件的横梁受力较为复杂,传统的计算方法无法满足设计要求,空间有限元方法影响计算效率。为解决上述问题,结合几种鱼腹式宽箱梁实例,在有限元分析的基础上,对横梁位置的恒载剪力传递规律进行总结归纳,结果表明:不同截面形式鱼腹式箱梁断面各部位传递至横梁的剪力数值及所占比例大致相同,以此为基础提出满足设计要求的简化计算方法,对鱼腹式宽箱梁横梁设计提出参考意见。

Fish-belly box girder is widely used in city viaduct for its wonderful appearance,and as an important part of it,the transverse beam has a complex mechanical properties.Traditional calculation method can not meet the requirements of engineering design, while spatial finite element analysis influences calculation efficiency.In order to solve the this problems,as examples,several beam were selected to summary how their shear transform thorough the transverse beam with solid finite element analysis method.The result shows that the proportion of shear force which is passed through to transverse beam from different parts of box girder are simiar. The simplified calculation method based on this result is suggested for the designer which can meet the requirements of engineering design well,and some opinions on design method of transverse beam of fish-belly box girder are given for reference.