摘要
针对桥宽28m的单箱三室连续刚构组合桥梁,分别建立了考虑桩—土相互作用的变截面三维梁单元模型和三维实体、板壳组合模型,分析了桥梁在均布荷载和集中荷载作用下的剪力滞效应,并讨论了两种模型对动力特性的影响。结果表明,均布荷载与集中荷载作用下箱梁的剪力滞效应明显不同,对于地震时程反应分析而言,考虑桩—土相互作用的变截面三维梁单元可以满足工程要求,并具有计算效率高的特点。
ITo counter continuous rigid frame composite bridge with single box and three cells of 25m bridge wide, it establishes a model of non-uniform three-dimensional beam unit and three-dimensional solid and plate-shell combination model, respectively, considering pile-earth interaction. The paper analyzes the shear lag effect of bridges under the role of uniform load and concentrated load, it also discuses the influence of two models on dynamic characteristics. The result shows that the shear lag effect of box beam under the action of uniform load and concentrated load is obviously different. For the ana￣lysis of earthquake time process the non-uniform three-dimensional beam unit considering pile-earth interaction could meet the project requirement and has the characteristics of high calculation efficiency.
出处
《城市道桥与防洪》
2006年第1期35-38,共4页
Urban Roads Bridges & Flood Control
关键词
连续刚构桥
薄壁箱梁
剪力滞效应
动力特性
有限元分析
continuous rigid frame bridge, thin-walled box beam, shear lag effect, dynamic characteristics, finite element analyses
