Abstract
This paper presents the results of the behavior of end zone of post-tensioned (PT) beams made of fiber reinforced concrete (FRC). The principal aim of using FRC was to enhance the ductility and post-cracking behavior of end-zone of post-tensioned beams. A stronger and tougher end-zone of PT-beams is necessary when it is subjected to dynamic loading. Post-tensioned (PT) beams are typically used for the construction of bridges and industrial buildings, which are often subjected to vibrations and cyclic loading. Pre-mature cracking of the end zone (EZ) of a PT-beam is considered the type of problem that may cause the structural collapse. In this research program, polyvinyl alcohol (PVA) and copper-coated steel (CCS) fibers were used in concrete for improving the EZ performance of PT-beams. The use of FRC caused a 50% reduction in the shear reinforcement within the end zone of the PT-beam, which also avoided the congestion of steel in the end zone. Hence, the concrete was placed homogeneously, and smooth finished surfaces of the beams were obtained. FRC controlled the bursting of the end zone during the transfer of the full pre-stress force, and approximately 25% increment in the strain energy of the end zone was observed, which was also found efficient in strain diminution along the length of the beam.
Highlights
For the past several years, the advances made in the field of prestressed-concrete have widened the freedom of architectural setting of floor-framing in a building structure
It is observed that control beams and fly ash concrete beams exhibit less used in the study have enhanced the ductility and mechanical properties of concrete
polyvinyl alcohol (PVA) fibers energy dissipation and less strain variation with distance, fiber reinforced concrete caused much higher effects on the elastic modulus of concrete, in 100% Ordinary Portland cement (OPC) concrete, without fly ash significantly increased the ductility of the end zone
Summary
For the past several years, the advances made in the field of prestressed-concrete have widened the freedom of architectural setting of floor-framing in a building structure. It was found that the cracks were formed due to the transmission of high intensity of compressive and tensile forces in the anchorage zone of the pre-stressed concrete beam The formation of such types of cracks may result in the loss of prestressing strength, which sometimes leads to in-service failure. It has been found that application of non-metallic fibers like PVA fiber and copper coated steel fiber is the best substitute for conventional steel fiber without any corrosion issue The research on these fibers is still in progress and is not yet applied to structural elements such as prestressed concrete. The principal aim of this research study was to investigate the performance of the end zone (EZ) of PT-beams made of FRC; two type of fibers; copper-coated micro steel (CCS) and PVA fibers were used. The first phase of the research program focused on investigating the effects of fiber content on the workability and mechanical properties of concrete, whereas the second phase of the research was to evaluate the contribution of PVA and CCS fibers in resolving performance concerns of the end-zone of PT beams
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