折面梁格法在曲线PC箱梁桥中的应用

The application of folding beam method in bending surface curve of PC box girder bridges

弯桥作为桥梁工程中常用的一种桥型,仍没有一种统一的设计方法准确分析这类结构的受力特性,本文采用折面梁格法对一座曲率半径150m四跨一联的弯桥在一次落架下恒载的支反力以及剪力滞效应进行了研究,分析了其空间效应,并与实体模型的计算结果进行对比。研究发现:弯箱梁桥中存在明显的剪力滞效应,需充分考虑弯桥受力的空间效应以保证结构的受力安全,采用折面梁格方法可以较准确模拟弯箱梁桥在恒载作用下的支反力不均及剪力滞效应,该方法为这类桥梁结构的设计提供了一个可靠的工具。

Curved bridge as a commonly used bridge in bridge engineering, there is not a unified design method for an accurate analysis of the stress characteristics of this kind of structure, this paper uses the folding beam method to study the supporting force and the shear lag effect of the constant load in a falling frame of a radius of curvature of 150 m four spans bridge, the spatial effect is analyzed and compared with the calculation results of the solid model. In this study, we found that there exists obvious shear lag effect in curved box girder bridge, the need to fully consider the curved bridge by the force of the spatial effect, to ensure structural stress, the folded plate beam grid method can be more accurate simulation of curved box girder bridge under the action of dead load reaction force and shear lag effect, the method for the design of this type of bridge structure provides a reliable tool.