Eccentric Punching Shear of Waffle Slab

This paper presents test results of six 1/10th-scale micro-concrete waffle slabs subjected to internal punching shear in the presence of moment transfer. Although the observed punching failure mechanism of a waffle slab was found to be very similar to that of a flat slab, the shear capacity is relat...

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Bibliographic Details
Published inACI structural journal Vol. 115; no. 1; pp. 163 - 173
Main Authors Al-Bayati, Ahmed Faleh, Leong, Lau Teck, Clark, Leslie A.
Format Journal Article
LanguageEnglish
Published Farmington Hills American Concrete Institute 01.01.2018
Subjects
Codes of Practice
Concrete
Concrete slabs
Design and construction
Failure load
Failure mechanisms
Failure surface
Measurement
Mechanical properties
Methods
Prediction models
Punching
Punching shear
Shear (Mechanics)
Shear stress
Slabs
Structural design
Testing
Upper bounds
Waffle-slab
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Summary:This paper presents test results of six 1/10th-scale micro-concrete waffle slabs subjected to internal punching shear in the presence of moment transfer. Although the observed punching failure mechanism of a waffle slab was found to be very similar to that of a flat slab, the shear capacity is relatively reduced because some of the potential failure surface is lost when it extends into the waffle section. Because the current codes of practice do not consider the punching shear mechanism of waffle slabs, the comparisons with the test results revealed that BS8110 and EC2 overestimated the punching capacities of waffle slabs, whereas ACI's prediction was conservative. A prediction model based on the upper-bound plasticity theory was proposed to predict the failure load, which gave good agreement with the tests. Keywords: design; internal punching shear; moment transfer; plasticity; reinforced concrete; waffle slab.
ISSN:0889-3241
1944-7361
DOI:10.14359/51701090