Failure mechanism of one-way slabs under concentrated loads after local reinforcement yielding

Failure mechanism of one-way slabs under concentrated loads after local reinforcement yielding

de Sousa, Alex M.D. (Universidade de São Paulo)
Lantsoght, E.O.L. (TU Delft Concrete Structures; Universidad San Francisco de Quito)
El Debs, Mounir K. (Universidade de São Paulo)

2023

One-way slabs under concentrated loads may fail by one-way shear such as wide beams, punching shear, flexure, or by combining two or more of these mechanisms. Nevertheless, most publications have only addressed shear and punching failures without flexural reinforcement yielding. This study investigates the ultimate shear capacity of one-way slabs under concentrated loads with local reinforcement yielding. In total, 12 tests were conducted on six reinforced concrete slabs. Simply supported slabs of 1.60 m × 3.40 m × 0.15 m were tested. Three parameters were varied: the load position, the span length and the reinforcement ratio. All slabs failed initially by punching with limited or extensive reinforcement yielding. Due to the relatively large amount of transverse reinforcement (0.44 %), most slabs underwent a large shear redistribution around the load, resulting in a wide beam shear failure after the local punching failure. The test results were compared to the theoretical predictions of shear, punching and flexure capacity using code expressions and the Extended Strip Model (ESM). The ESM resulted in the closest predictions of the experiments. These experiments confirm that a brittle shear and punching failure mechanism can occur even after extensive reinforcement yielding. Moreover, the results indicate that the ESM can be used to assess one-way slabs under concentrated loads with local reinforcement yielding.

Code provisions
Concentrated load
Extended strip model
Flexure
One-way shear
One-way slabs
Punching shear
Reinforcement yielding

http://resolver.tudelft.nl/uuid:059b46cb-b9f6-41d4-a22a-7ec5297fd466

https://doi.org/10.1016/j.engstruct.2023.116396

2023-12-17

0141-0296

Engineering Structures, 291

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2023 Alex M.D. de Sousa, E.O.L. Lantsoght, Mounir K. El Debs