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- Title
Design of shear reinforcement for thick plates using a strut-and-tie model.
- Authors
Marzouk, H.; Rizk, E.; Tiller, R.
- Abstract
The strut-and-tie method is a rational approach to structural concrete design that results in a uniform and consistent design philosophy. A strut-and-tie model has been developed to model the punching-shear behaviour of thick concrete plates. This model provides a quick and simple approach to check the punching-shear behaviour. Thick concrete slabs (250-500 mm) without shear reinforcement can exhibit brittle shear failure under a central force and an unbalanced moment. Shear reinforcement has proven to be very effective in preventing such failures. The developed strut-and-tie model has also been used to evaluate the minimum shear reinforcement required to prevent brittle shear failure of two-way slabs in the vicinity of concentrated loads. The strut-and-tie model for symmetric punching consists of a “bottle-shaped” compressive zone in the upper section of the slab depth, leading to a “rectangular-stress” compressive zone in the lower section of the slab depth. Inclined shear cracking develops in the bottle-shaped zone prior to failure in the lower zone. Cracking in the bottle-shaped zone is related to the splitting tensile strength of concrete.
- Subjects
STRUT &; tie models; SHEAR (Mechanics); PUNCHING (Metalwork); CONCRETE slabs; MOMENTS of inertia; CRACKING of concrete
- Publication
Canadian Journal of Civil Engineering, 2010, Vol 37, Issue 2, p181
- ISSN
0315-1468
- Publication type
Article
- DOI
10.1139/L09-120