预应力混凝土多室宽箱梁桥单梁模型与梁格模型有限元对比分析与研究

Contrastive Analysis and Research of Single Beam Model and Grillage Model for Prestressed Concrete Multi-chamber Wide-box Girder Bridge by Finite Element

摘要:

在路线线形受限的条件下，为追求城市桥梁简洁协调的美观效果，弯桥、宽箱梁桥以及斜交桥梁的上部结构截面形式更多的采用箱形截面，这些小曲率半径或者变宽斜交的桥梁与常规的直线或者大曲率半径上的桥梁在相同荷载作用下，结构的内力等方面差别较大。梁格法能够更加真实的反应出宽桥的实际受力情况，但是计算较为繁琐，耗时较久。通过分析单梁法及梁格法计算结果，以期通过提高单梁法分析结果富余量的方式来确保结构设计满足规范要求。

Abstract:

Under the condition of limited alignment, in order to pursue the aesthetic effect of concise coordination of urban bridges, the superstructure section forms of curved bridges, wide-box girder bridges and skew bridges have been the box-shaped sections. Compared with the bridges of conventional straight line or great curvature radius, these bridges of small curvature radius or widening skew have the different structural internal force under the same loading. The grillage method can reflect the actual stress situation of the wide bridge more truly, but the calculation is more complicated and time-consuming. By analyzing the results of single beam method and grillage method, it is hoped that the method of increasing the surplus of single beam method can ensure that the structural design meets the specification requirements.