双向预应力鱼腹箱梁应力分配的空间网格分析

Spatial grid analysis of stress distribution in two dimension prestressing box beam

现代城市桥梁的建设不仅要满足安全、适用、经济,还要满足景观需求,以北京市丽泽路改扩建工程宽鱼腹箱梁为背景,为模拟箱梁的剪力滞效应、薄壁效应与各腹板的受力分配以及横纵向预应力的相互影响,对桥梁进行了空间网格精细化分析。结果表明各腹板应力分配不均匀,设置横向预应力有利于各腹板应力的均匀分配。

The construction of modem urban bridges should not only meet the safety, application, economy, but also meet the needs of the landscape. This paper takes Beijing City Lize Road reconstruction project wide fish bellied box girder as the background for the shear lag effect of box girder, simulation and the effect of thin-walled webs under the mutual influence and the transverse and longitudinal prestressing force distribution of the bridge, the space grid refinement analysis. The results show that the stress distribution of the web is not uniform, and the setting of transverse prestress is beneficial to the uniform distribution of stress in the web.