Predicting the shear capacity of reinforced concrete slabs subjected to concentrated loads close to supports with the modified bond model

Predicting the shear capacity of reinforced concrete slabs subjected to concentrated loads close to supports with the modified bond model

Lantsoght, E.O.L.
Van der Veen, C.
De Boer, A.

Civil Engineering and Geosciences

Structural Engineering

2014-09-05

The shear problem is typically studied by testing small, heavily reinforced, slender beams subjected to concentrated loads, resulting in a beam shear failure, or by testing slab-column connections, resulting in a punching shear failure. Slabs subjected to concentrated loads close to supports, as occurring when truck loads are placed on slab bridges, are much less studied. For this purpose, the Bond Model for concentric punching shear was studied at first. Then, modifications were made, resulting in the Modified Bond Model. The Modified Bond Model takes into account the enhanced capacity resulting from the direct strut that forms between the load and the support. Moreover, the Modified Bond Model is able to deal with moment changes between the support and the span, as occurs near continuous supports, and can take into account the reduction in capacity when the load is placed near to the edge. The resulting Modified Bond Model is compared to the results of experiments that were carried out at the Stevin laboratory. As compared to the Eurocodes (NEN-EN 1992-1-1:2005) and the ACI code (ACI 318-11), the Modified Bond Model leads to a better prediction.

arching action
bond
compressive strut
continuous supports
edge loading
punching shear
shear
slabs
torsion

http://resolver.tudelft.nl/uuid:18c903d2-9600-4b95-a2e5-81ab738d9692

IABSE

978-3-85749-135-2

Proceedings of the 37th IABSE symposium, 1-8. (2014)

Institutional Repository

conference paper

(c) Lantsoght, E.O.L.
van der Veen, C.
De Boer, A.