Collaborative Proposal: Micro-Macro Modeling of the External Strengthening of Concrete with Fiber Reinforced Polymer

纤维增强聚合物增强混凝土外部加固的微观宏观模拟该项目的目标是开发创新的短期测试，以开发分析模型来准确预测改装后的公路桥梁结构的长期性能。具体地说，用于外部加固的混凝土衬底和玻璃钢复合材料之间的界面粘结必须在一系列机械载荷、温度循环、水分扩散和除冰盐进入的特定寿命内保持耐久。开发粘结耐久性预测方法的技术途径包括使用纳米级断口检查了解粘结界面处退化的基本机制，并将这些结合到分析模型中，使用全局-局部子结构来桥接长度尺度。

MICRO-MACRO MODELING OF THE EXTERNAL STRENGTHENING OF CONCRETE WITH FIBER REINFORCED POLYMERABSTRACT The objective of the project is to develop innovative short-term tests that would allow the development of analytical models for accurate prediction of long-term performance of retrofitted highway bridge structures. Specifically, the interfacial bond between the concrete substrate and the FRP composite material used for external strengthening must remain durable for the specified lifetime over a range of mechanical loads, temperature cycles, moisture diffusion and de-icing salt ingress. The technical approach for developing a bond durability prediction methodology consists of understanding the fundamental mechanisms of degradation at the bond interphase using nano-scale fractograhic inspection and incorporating these in analytical models using global-local substructuring to bridge length-scales.