粘贴碳纤维的预应力混凝土连续梁剪力滞效应分析

Shear Lag Effect of Prestressed Concrete Continuous Beam Pasted with Carbon Fiber

为研究不同方式粘贴碳纤维对预应力混凝土连续梁桥剪力滞效应的影响,以某公路标准设计预应力混凝土连续箱梁桥为背景,基于ANSYS有限元软件建立有限元模型,分析了两种不同加固方式情况下,梁体分别承受预应力、自重、车辆荷载及以上三种工况组合作用下控制截面的剪力滞效应变化规律.通过分析得出结论:采用底板满铺碳纤维和底板纵向间隔粘贴碳纤维两种方式,均对剪力滞效应有影响,而底板满铺对剪力滞系数影响较显著.

In order to research shear lag effect of prestressed concrete continuous girder bridge pasted with carbon fiber,a corresponding highway standard design was taken as the background to establish finite element model using the finite element software ANSYS. The paper analyzes the shear lag effect of control section using the two different reinforcement methods,respectively under the action of prestressing force,gravity,vehicle load and the combination working condition of the above three methods. By analysis,we draw the conclusion that the bottom full pasting of carbon fiber and bottom longitudinal interval pasting carbon fiber both have influence on the shear lag effect,and the former has more obvious effects on the shear lag coefficient.