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research article

Crushing and Flexural Strength of Slab-Column Joints

Guidotti, Roberto  
•
Fernández Ruiz, Miguel  
•
Muttoni, Aurelio  
2011
Engineering Structures

In multi-storey buildings, columns are usually not continuous through the slabs to enhance ease of construction. Consequently, in slab–column joints, slabs have to carry column loads in addition to the shear and bending moments due to loads applied to the slab. In most cases, when high strength concrete is used for the columns and normal strength concrete for the slabs, compression stresses at the support areas of the inner columns exceed the uniaxial compressive strength of the concrete of the slab. Due to this reason, most current details for such regions reinforce the concrete of the slab between columns to ensure load transfer. Typically, this is achieved by linking top and bottom columns with reinforcement. Sometimes, it is also needed to incorporate special load transfer devices. This latter solution is however relatively complicated and expensive. In this paper, the crushing and flexural strength of slab–column joints is investigated accounting for an increase of the compressive strength of the failure region (concrete between columns) due to confinement stresses provided by the flexural reinforcement of the slab. The results of an experimental programme on 6 full-scale slabs (250 mm thick) are presented showing that flexural reinforcement of a slab significantly increases the crushing strength of slab–column joints. This allows ensuring load transfer without incorporating special devices or even without linking top and bottom column reinforcement for a wide range of cases leading potentially to more economic designs. An analytical approach, grounded on the theory of plasticity, is also presented allowing one to determine a failure criterion for such regions. This approach, which can also be used for design purposes, leads to an excellent correlation with test results.

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Type
research article
DOI
10.1016/j.engstruct.2010.12.007
Web of Science ID

WOS:000287901300016

Author(s)
Guidotti, Roberto  
Fernández Ruiz, Miguel  
Muttoni, Aurelio  
Date Issued

2011

Publisher

Engineering structures

Published in
Engineering Structures
Volume

33 n° 3

Start page

855

End page

867

Subjects

béton confiné

•

colonne

•

dalle

•

loi constitutive

•

plasticité

•

confined concrete

•

column

•

slab

•

constitutive law

•

plasticity

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
IBETON  
Available on Infoscience
March 31, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/65829
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