基于梁格法的变宽异型箱梁结构分析

基于梁格法建立线形复杂的异型箱梁结构的有限元模型,得到全桥纵向和横向的内力分布情况。根据梁格法的结果改进箱梁结构和预应力束配置,并建立单梁简化模型与梁格模型进行应力计算结果的对比。结果表明:相对于单梁模型,梁格模型能得到更加准确的计算结果,且体现异型箱梁弯扭耦合的受力特点,可用于指导变宽异型箱梁结构的设计。

Structure Analysis of Special-Shaped Box Girder Bridge of Width Variety Based on Beam Grillage Theory

Based on beam grillage theory,a finite element model of complex linear special-shaped box girder structure is built and the distribution of internal stress of the whole bridge is obtained.The box girder bridge structure and allocation of prestess bars are improved on the basis of the results of beam grillage theory,and a single beam model is built to compare with the grillage model.The results of strain are compared too.The results of calculation indicate that the grillage model can offer more exact calcula...