摘要
脊骨梁的悬臂特别长,作为梁的一部分,翼板将参与梁的纵向弯曲,其横向剪力滞效应非常显著;同时悬臂板将板上的荷载横向传递给脊梁时产生横向弯曲,即还存在纵向剪力滞效应问题,为了明确脊骨梁整体和局部力学行为特征,以及翼板在横向弯曲时的纵向有效分布宽度,通过组合有限元方法,建立脊骨梁的三维实体单元模型,考虑预应力和各种加载方式,分析预应力混凝土脊骨梁纵向、横向剪力滞效应,为混凝土脊骨梁的设计提供参考。
The cantilever of spine beam is very wide. As the part of bridge, wing plates will partake in lon- gitudinal warping of beam, and the transversal shear lag effect is very distinct. At the same time, there is longitudinal shear lag effect when the cantilever plates produce transversal warping while transversely transferring load to the spine beam. To understand the integral and partial mechanical character, through integrated finite ele- ment, considering prestressed and loaded pattern, the paper builds up 3 D finite element model to study on shear lag effect of prestressed concrete spine beam in detail, and the conclusion may be applied to the design of spine beam for reference.
关键词
脊骨梁
剪力滞效应
组合有限元
spine beam
shear lag effect
integrated finite element
