Abstract
The performance suitability of precast concrete structures is determined by the design and construction of connections between elements. In spite of its simplicity, the use of bond connections through bar reinforcement splices is limited by issues related to long splice lengths required and reinforcement congestion. Reinforcement splices embedded in Ultra High Performance Fibre Reinforced Concrete (UHPFRC) were tested in beam specimens, as part of an on-going investigation to develop a novel typology of beam-column connection between precast elements using UHPFRC. Elements made up of two precast elements joined through reinforcement splices in a central region poured with UHPFRC, and without using closed stirrups or vertical ties were tested in beam tests. The experimental results for splice lengths between 10 db and 20 db exhibited an adequate performance to connections undergoing load and unload cycles, being this an unfavourable condition for bond capacity, and using short covers and transversal spacing between splices, under 0.7 db. It is therefore clear that the higher tensile capacity and ductility of UHPFRC have a positive effect on confinement, bond conditions and force transference as well as a stiffness effect.
Highlights
Reinforcement splices embedded in Ultra High Performance Fibre Reinforced Concrete (UHPFRC) were tested in beam specimens, as part of an on-going investigation to develop a novel typology of beam-column connection between precast elements using UHPFRC
Uso de hormigones con fibras de ultra-alta resistencia para el desarrollo de conexiones entre elementos prefabricados Ultra High Performance Fibre Reinforced Concrete (UHPFRC) for connections between precast elements efecto en las características de adherencia del material y la resistencia de anclajes y solapes de armadura parece ser subestimado con la realización de ensayos de pullout [3], lográndose ligeros o insignificantes aumentos en las tensiones pico de adherencia pero evidenciando el efecto de la mayor ductilidad en el momento de fallo
El desarrollo de la capacidad última en los elementos con longitud de solape de 14db sin contar con el uso de cercos cerrados o tirantes verticales de refuerzo trasversal, pone de manifiesto la relevancia de las propiedades del UHPFRC utilizado en el desarrollo de conexiones por adherencia con longitudes de solape corta
Summary
El adecuado comportamiento de estructuras prefabricadas de hormigón se encuentra condicionado por el diseño y ejecución de las conexiones entre sus elementos. El uso de conexiones rígidas basadas en la adherencia mediante el solape de armaduras se ve en muchos casos limitado, a pesar de su simplicidad, por problemas derivados de las considerables longitudes de solape requeridas y la congestión en el refuerzo. En el desarrollo de este estudio, enmarcado dentro del trabajo de investigación para la puesta a punto de una conexión para pórticos prefabricados con el uso de hormigones de altas especificaciones reforzados con fibras (Ultra High Performance Fibre Reinforced Concrete-[UHPFRC]), se evaluó experimentalmente el comportamiento de solapes de armaduras embebidos en UHPFRC en conexiones simples de vigas de hormigón armado. Reinforcement splices embedded in Ultra High Performance Fibre Reinforced Concrete (UHPFRC) were tested in beam specimens, as part of an on-going investigation to develop a novel typology of beam-column connection between precast elements using UHPFRC.
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