基于ABAQUS的超高韧性组合桥横向整体受力数值模拟

Numerical Simulation of Transverse Overall Stress of Ultra⁃high Toughness Composite Bridge Based on ABAQUS

为了研究超高韧性组合桥在车轮荷载作用下的横向受力特性,通过ABAQUS建立了超高韧性混凝土(UHTCC)-钢组合桥面结构有限元模型,选取适合的材料本构、单元类型和接触关系,根据塑性损伤模型,对不同栓钉间距和钢筋配筋率、不同铺装层厚度的桥面方案整体横向应力进行对比,分析了这两种因素对于超高韧性组合桥面板静力性能的影响。结果表明:所建立的模型能够较为准确的模拟车轮荷载作用下超高韧性组合桥的横向整体受力情况;UHTCC作为正交异性桥面板的铺装层,能显著改善U形肋与桥面板连接处的疲劳性能;一定范围内,增大栓钉间距、降低钢筋配筋率会导致U形肋与桥面板连接处及对应竖向位置处的UHTCC层的整体横向应力增大;增大UHTCC层厚度能明显降低U形肋与桥面板连接处的整体横向应力。

In order to study the lateral force characteristics of the ultra⁃high toughness composite bridge under wheel load,the finite element model of UHTCC⁃steel composite bridge deck structure was established by ABAQUS.The suitable material constitutive,element type and contact relationship were selected.According to the plastic damage model,the overall lateral stress of bridge deck scheme with different stud spacing,reinforcement ratio and pavement thickness was compared,and the influence of these two factors on the static performance of ultra⁃high toughness composite bridge deck was analyzed.The results show that the established model can accurately simulate the transverse overall stress of ultra⁃high toughness composite bridge under wheel load.As the pavement layer of orthotropic bridge deck,the fatigue performance of the connection between U⁃shaped rib and bridge deck can be improved significantly by UHTCC.Within a certain range,increasing the stud spacing and reducing the reinforcement ratio will lead to the increase of the overall transverse stress of the connection between U⁃shaped rib and bridge deck as well as the UHTCC layer at the corresponding vertical position.Increasing the thickness of UHTCC layer can greatly reduce the overall transverse stress at the joint of U⁃shaped rib and bridge deck.