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Evaluation of strengthening through laboratory testing of FRP rehabilitated bridge decks after in-service loading

机译：在服役后通过玻璃钢修复后的桥面的实验室测试评估加固效果

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This paper provides details of an investigation into strengthening efficiency of FRP rehabilitated bridge deck slabs through tests conducted on slab sections cut from a bridge just prior to demolition. Thus the deck sections (one unstrengthened, and two strengthened using FRP composites) were subjected to routine traffic prior to removal and testing. A systems identification technique was used to match the response of the finite element model with that of the test specimen obtained through forced vibration based dynamic modal tests. Available analytical models and design guidelines were used to predict the response and capacity of such field representative specimens. The test results validated the efficacy of FRP strengthening as a means of life extension and demonstrate the feasibility of rehabilitation for two different modes of intended response. The predictions were found to closely match the actual response of the test specimens. The use of infrared (IR) thermography as a tool for damage/defect detection as well as in monitoring the progression of damage was also demonstrated. Finally, the equivalent capacity of the bridge deck slabs was computed based on a local-global modeling approach.
机译：本文提供了详细的调查资料，该资料通过对刚拆除之前从桥梁上切下的平板截面进行的测试来研究增强FRP修复的桥面平板的效率。因此，在拆除和测试之前，应对甲板部分（其中一个未加固，两个使用FRP复合材料加固）进行例行交通。使用系统识别技术将有限元模型的响应与通过基于强制振动的动态模态测试获得的试样的响应进行匹配。现有的分析模型和设计指南用于预测此类现场代表性标本的响应和能力。测试结果验证了FRP强化作为延长寿命的功效，并证明了针对两种不同预期反应模式进行康复的可行性。发现这些预测与测试样品的实际响应非常匹配。还证明了使用红外（IR）热成像技术作为损坏/缺陷检测以及监视损坏进程的工具。最后，基于局部全局建模方法计算了桥面板的等效承载力。

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