Vehicle Collision with Reinforced Concrete Columns Wrapped with Fiber-Reinforced Polymer Composites
Vehicle Collision with Reinforced Concrete Columns Wrapped with Fiber-Reinforced Polymer Composites
复制标题
车辆与纤维增强聚合物复合材料包裹的钢筋混凝土柱碰撞
DOI：
10.14359/51734335
复制
发表时间：
2022-03-01
影响因子：
1.8
通讯作者：
Kang, Thomas H. -K.
中科院分区：
文献类型：
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作者：
Liu, Tao;Chen, Lin;Kang, Thomas H. -K.
在役钢筋混凝土(RC)柱在车辆碰撞作用下的主要破坏模式一般为剪切破坏。纤维增强聚合物(FRP)复合材料已被广泛用于加固钢筋混凝土结构。本文通过数值模拟研究了FRP加固足尺钢筋混凝土桥墩柱在车辆碰撞作用下降低潜在碰撞损伤和防止剪切破坏的效果。通过将数值计算结果与室内冲击试验结果进行比较，验证了所建立的平面和FRP包裹钢筋混凝土柱的有限元模型。将已验证的有限元建模方法扩展到建立足尺未加固和FRP包裹的RC墩柱模型。研究了车速、层数、玻璃钢缠绕类型以及纤维取向对结构响应的影响。数值结果表明，增加FRP缠绕层数可以显著减少柱的损伤和位移，但对柱的冲击力、剪力和弯矩的耗散影响较小。提出了两个无量纲损伤指标来评价剪切破坏。
The dominant failure mode for existing reinforced concrete (RC) columns exposed to vehicle collisions is generally shear. Fiber-reinforeed polymer (FRP) composites have been widely used to retrofit RC structures. This study numerically investigates FRP's effectiveness in reducing potential collision damage and preventing shear failure in full-scale RC pier columns retrofitted with FRP wraps under vehicle collision. Developed finite element (FE) models of plain and FRP-wrapped RC columns were well validated by comparing numerical results against laboratory impact test results. The validated FE modeling method was extended to build full-scale unstrengthened and FRP-wrapped RC pier column models. A parametric study was performed examining the effect of vehicle velocity and layer number and types of FRP wraps, as well as fiber orientation, on the structural responses. Numerical results showed that an increase in the number of layers of FRP wraps could significantly reduce column damage and displacements but has less influence on the dissipation of impact force, shear form, and moment of the columns. Two dimensionless damage indexes were proposed for the assessment of shear failure.