Structural Health Monitoring to Determine Long-Term Behavior of AFRP Composite Bars in Prestressed Concrete Panels for Field Deployment
| 项目名称： | Structural Health Monitoring to Determine Long-Term Behavior of AFRP Composite Bars in Prestressed Concrete Panels for Field Deployment |
| 摘要： | Corrosion-induced deterioration of steel rebar in concrete structures often demands costly repair and maintenance, where the steel rebar swells and increases the tensile load in concrete resulting in cracks, spallings, and openings that increase its susceptibility to corrosion. Previous research by the principal investigator has shown the validity, deformability and suitability of aramid fiber reinforced polymer (AFRP) bars used in prestressed, precast concrete deck panels (PCPs). However, research is still needed to monitor and assess the long-term behavior of AFRP bars due to creep, shrinkage, and prestress losses when exposed to thermal and sustained loads similar to "in-situ" bridge conditions. The research will be divided into two phases: (1) a laboratory-scale investigation for accelerated degradation and time-dependent behavior and (2) a full-scale investigation for long-term performance evaluation under natural environmental conditions. Phase I will examine effects of freeze-thaw, creep, and shrinkage effects whereas Phase II will focus on constructing two full-scale, PCPs: One with conventional prestressing steel and the other prestressed with AFRP bars that will be continuously monitored outdoors. For both phases instrumentation (internal and external measures) will be deployed for measuring strain response of the specimens. Where appropriate, the investigators will deploy state-of-the-art digital imaging correlation (DIC), a non-contact optical based deformation measurement technique, for monitoring specimen behavior. This study will also serve as a testbed for deploying DIC for performance monitoring of concrete structure and finite element analysis (FEA) to numerically compare system performance to conventional designs. |
| 状态： | Active |
| 资金： | 187000.00 |
| 资助组织： | Mid-Atlantic Universities Transportation Center |
| 执行机构： | Morgan State University |
| 开始时间： | 20120101 |
| 实际结束时间： | 20141231 |
| 主题领域： | Bridges and other structures；Construction；Design；Highways；I15: Environment |
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