Faserverbundkunststoff (FVK)-Bewehrung unter Druckbeanspruchung

Fibre reinforced polymer (FRP) reinforcement in compression

Due to their advantageous durability properties and high tensile strength, fibre reinforced polymer (FRP) reinforcements represent a serious alternative to conventional reinforcing steel. While the use of FRP bars, meshes, or stirrups for resisting tensile stresses is regulated in the DAfStb guideline “Nichtmetallische Bewehrung,” their application in compression is currently excluded by standards. This paper presents an experimental methodology for the determination of the compressive strength and elastic modulus of FRP reinforcement bars. In total, 95 tests were carried out on reinforcement bars made from glass, basalt, and carbon fibres. The results show a linear stress-strain behaviour up to brittle failure. Based on the results, partial safety factors are derived, enabling integration into the Eurocode design concept. In addition, design aids for centrically and eccentrically compressed cross-sections are developed, and a minimum reinforcement ratio is defined to prevent brittle tensile failure. The results of this paper will partly contribute to the second edition of the DAfStb guideline „Nichtmetallische Bewehrung“.