Multiscale analysis of GFRP reinforcements for concrete under special stress and environmental conditions- modelling strength and durability

点击翻译按钮获取中文摘要

The research addresses a crucial question of performance of glass fibre reinforced polymer (GFRP) reinforcements for concrete construction. In particular, testing and numerical analysis of GFRP composites and GFRP reinforced concrete structures are proposed. These include short-term and long-term performance and subsequent failure. Long-term performance influences failure and it is likely the most critical issue that needs to be addressed in order to safely use GFRPs as structural materials. The composite GFRP bar is an engineered material with high strength in the fibre direction, which is generally aligned along the bar. GFRP reinforcing bars are composed of glass fibres and a resin matrix, which holds the fibres together and protects them from the surrounding media. GFRP composites have been successfully used as reinforcement in concrete structures where corrosion or electromagnetic inertness is a concern. This proposal addresses evaluation and development of design methods, material specifications and test methods for GFRP reinforcements concentrating on mechanical performance of bent bars (bars manufactured under non-typical manufacturing conditions), bond properties, and durability of these bars. Unusual loading conditions like dowel strength are also addressed, in contrast to the simplified single load level tests on which current GFRP standards are based. A performance-based description of short and long-term resistance is proposed to describe limit states and realistic safety margins. Hence, the primary objective of this work is to provide information and design recommendations regarding safe levels of strength for GFRP bars used in construction.