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

0085015根据1992年联邦桥梁目录的数据，全国576，665座桥梁中约有39%由于长期退化而存在结构缺陷。使用纤维增强聚合物（FRP）改造是有吸引力的，但可靠的预测模型和合理的设计准则，在民用基础设施的应用中使用FRP改造是必要的。该项目的目标是开发创新的短期实验，以便开发分析模型，准确可靠地预测改造后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。 桥接几个长度尺度的实验和模型将用于开发分层机制的基本理解和可用于设计指南的预测能力。这是一个合作研究项目之间的UT奥斯汀和U。密苏里州罗拉市 **

0085015Based on 1992 data of the federal bridge inventory, about 39% of the nation's 576,665 bridges are structurally deficient due to long-term degradation. The use of fiber reinforced polymer (FRP) retrofit is attractive but reliable predictive models and sound design guidelines for the use of FRP retrofit in civil infrastructure applications are needed. The objective of the project is to develop innovative short-term experiments that would allow the development of analytical models for accurate and reliable 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. Experiments and models that bridge several length scales will be used to develop basic understanding of delamination mechanisms and a predictive capability that can be used to for design guidelines. This is a collaborative research project between UT-Austin and U. of Missouri-Rolla.***