Abstract
Article briefly discusses the factors affecting bond between concrete and reinforcement of prestressed concrete member. Behavior of prestressed concrete member during release of reinforcement is discussed. Comparative analysis of equations, which describes relation between strand draw-in and transfer length, is presented. Article analyses distribution of loss of prestress at the anchorage zone of prestressed concrete member. Estimation of rational position of strands at the anchorage zone of flexural prestressed concrete member was performed. Influence of constant and linearly variable stress distribution at the end of the strand and member cross-section hight on the position of the reinforcement at the member crosssection is analysed. Straipsnyje trumpai aptariami įtemptųjų gelžbetoninių konstrukcijų sukibimą tarp betono ir armatūros lemiantys veiksniai. Aprašoma įtemptojo gelžbetoninio elemento elgsena atleidžiant armatūrą. Pateikiama kitų autorių eksperimentiniais tyrimais nustatytų priklausomybių tarp lynų praslydimo ir įtempių perdavimo ilgio lyginamoji analizė. Straipsnyje analizuojamas įtempių nuostolių pasiskirstymas įtemptojo gelžbetoninio elemento inkaravimo zonoje, apskaičiuota racionali įtemptojo lenkiamojo gelžbetoninio elemento lynų padėtis inkaravimo zonoje. Analizuojama, kokią įtaką lynų padėčiai elemento skerspjūvyje daro nuolatinis ir kintamas įtempių pasiskirstymas lynų galuose bei elemento skerspjūvio aukštis.
Highlights
Prestressed concrete structure can be pretensioned or post-tensioned depending on when the prestressing force is introduced
Transfer length is influenced by bond between reinforcement and concrete, which is ensured by three factors: adhesion at the interface between concrete and steel; friction between the concrete and steel; mechanical resistance due to interlocking of the twisted strand wires and the surounding concrete
Mechanical bond between concrete and steel is ensured by surface roughness of the strand
Summary
Prestressed concrete structure can be pretensioned or post-tensioned depending on when the prestressing force is introduced. Bond between concrete and reinforcement usually ensures anchorage of pretensioned strands. The prestressing force is transfered to the concrete by releasing the prestressed strands. Transfer length is influenced by bond between reinforcement and concrete, which is ensured by three factors: adhesion at the interface between concrete and steel; friction between the concrete and steel; mechanical resistance due to interlocking of the twisted strand wires and the surounding concrete. Mechanical resistance due to interlocking of the twisted strand wires and the surounding concrete occurs after adhesion failure between concrete and steel. Mechanical bond between concrete and steel is ensured by surface roughness of the strand (helical shape of the strand, indentations). During release of pretensioned strands there are no anchoring devices at the end of prestressed concrete member. Jokūbaitis et al The influence of prestress losses on the anchorage zone of prestressed concrete member
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