This paper presents the current state of the art on the modelling and experimental work dealing with the long-term behaviour of composite steel-concrete structures and how this affects the response at service and ultimate conditions. The structural elements considered include columns, slabs and beams. In the latter case, only H-shaped or box steel sections with a solid and composite slabs have been considered. In the initial part of the paper considerations on the time-dependent behaviour of the concrete are provided for each structural element to account for the different drying conditions which, for example, occur in the presence of the hollow sections in columns and of the steel deck in floor systems. When presenting previous work on the long-term response of composite columns particular attention is placed on the influence of time effects on the ultimate response, considerations on confinement at service conditions and creep buckling. Only brief considerations are provided for the long-term response of composite slabs because of the very limited work carried out in this area. Despite this, recent research dealing with the development of shrinkage gradients through the thickness of slabs cast on profiled sheeting is provided. Considerations on the work carried out to date on composite beams are presented with particular focus given to design related issues, such as the determination of the concrete slab effective widths, shear-lag effects, influence of time effects on the ultimate response, prestressing and buckling. The paper concludes with recommendations for future research work to be carried out in this area.

Long-term behaviour of composite steel-concrete structures: an overview of the state of the art

LEONI, Graziano;
2012

Abstract

This paper presents the current state of the art on the modelling and experimental work dealing with the long-term behaviour of composite steel-concrete structures and how this affects the response at service and ultimate conditions. The structural elements considered include columns, slabs and beams. In the latter case, only H-shaped or box steel sections with a solid and composite slabs have been considered. In the initial part of the paper considerations on the time-dependent behaviour of the concrete are provided for each structural element to account for the different drying conditions which, for example, occur in the presence of the hollow sections in columns and of the steel deck in floor systems. When presenting previous work on the long-term response of composite columns particular attention is placed on the influence of time effects on the ultimate response, considerations on confinement at service conditions and creep buckling. Only brief considerations are provided for the long-term response of composite slabs because of the very limited work carried out in this area. Despite this, recent research dealing with the development of shrinkage gradients through the thickness of slabs cast on profiled sheeting is provided. Considerations on the work carried out to date on composite beams are presented with particular focus given to design related issues, such as the determination of the concrete slab effective widths, shear-lag effects, influence of time effects on the ultimate response, prestressing and buckling. The paper concludes with recommendations for future research work to be carried out in this area.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11581/268399
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