Estudio de la transferencia de cortante en interfaces sin armaduras de refuerzo en elementos compuestos de hormigón estructural
Cargando...
Archivos
Fecha
Autores
Murga Piñeiro, Ricardo
Título de la revista
ISSN de la revista
Título del volumen
Editor
Universidad Central “Marta Abreu” de Las Villas. Facultad de Construcciones. Departamento de Ingeniería Civil.
Resumen
En la construcción moderna son muy utilizadas las secciones de hormigón estructural fabricadas por etapas, las cuales se denominan secciones compuestas. Estos elementos surgieron como la solución óptima para obtener al mismo tiempo las ventajas presentadas por los elementos hormigonados “in situ” y prefabricados. Debido a su propia concepción estos elementos presentan una interface o unión entre los hormigones colocados en diferentes etapas que debe garantizar una adecuada transferencia de esfuerzos cortantes para permitir el trabajo conjunto de la sección. Para su estudio la experimentación ha sido la base en el desarrollo de las expresiones de diseño; estando estas encaminadas generalmente a interfaces que presentan acero de refuerzo, a pesar de la existencia de una gran diversidad de aplicaciones donde por diversas razones este no se presenta. Una revisión de la bibliografía existente evidencia una amplia diversidad de criterios entorno a los métodos de diseño de interfaces sin acero de refuerzo. En el presente trabajo se valoran estos métodos a partir del análisis de resultados experimentales existentes. También se establece una clasificación alternativa para las interfaces que resultó ser efectiva. Un estudio de casos aplicados a secciones compuestas de hormigón pretensado con este tipo de interfaces caracteriza el tipo de fallo que presentan, y la importancia que reviste la transferencia de cortante horizontal para las mismas; demostrando que el enfoque dado por ACI-318 (2014) con algunas recomendaciones es efectivo.
In modern construction, structural concrete sections fabricated by stages, which are called composite sections, are widely used. These elements emerged as the optimal solution to obtain at the same time the advantages presented by the cast in place concrete and prefabricated concrete. Due to its own conception these elements present an interface or union between the concretes placed in different stages that must guarantee an adequate transfer of shear forces to allow the joint work of the section. For its study, experimentation has been the basis in the development of design expressions; being these routinely routed to interfaces that have reinforcing steel, despite the existence of a wide variety of applications where for various reasons this does not occur. A review of the existing literature reveals a wide diversity of criteria regarding the design methods of interfaces without reinforcing steel. In the present work, these methods are evaluated based on the analysis of existing experimental results. It also establishes an alternative classification for the interfaces that turned out to be effective. A study of cases applied to composite sections of prestressed concrete with this type of interface characterizes the type of failure they present, and the importance of horizontal shear transfer for them; demonstrating that the approach given by ACI-318 (2014) with some recommendations is effective.
In modern construction, structural concrete sections fabricated by stages, which are called composite sections, are widely used. These elements emerged as the optimal solution to obtain at the same time the advantages presented by the cast in place concrete and prefabricated concrete. Due to its own conception these elements present an interface or union between the concretes placed in different stages that must guarantee an adequate transfer of shear forces to allow the joint work of the section. For its study, experimentation has been the basis in the development of design expressions; being these routinely routed to interfaces that have reinforcing steel, despite the existence of a wide variety of applications where for various reasons this does not occur. A review of the existing literature reveals a wide diversity of criteria regarding the design methods of interfaces without reinforcing steel. In the present work, these methods are evaluated based on the analysis of existing experimental results. It also establishes an alternative classification for the interfaces that turned out to be effective. A study of cases applied to composite sections of prestressed concrete with this type of interface characterizes the type of failure they present, and the importance of horizontal shear transfer for them; demonstrating that the approach given by ACI-318 (2014) with some recommendations is effective.