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

纤维增强聚合物混凝土体外加固的细观-宏观模型 该项目的目标是开发创新的短期测试，以便开发分析模型，准确预测经过改造的公路桥梁结构的长期性能。具体而言，混凝土基底和用于外部加固的FRP复合材料之间的界面粘结必须在机械载荷、温度循环、水分扩散和除冰盐进入的范围内保持规定寿命的耐久性。开发粘结耐久性预测方法的技术途径包括理解使用纳米级fractograhic检查的粘结界面处的退化的基本机制，并将其纳入使用全球-局部子结构桥接长度尺度的分析模型中。

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.