Punching Shear Capacity of Double Layer FRP Grid Reinforced Slabs

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Title: Punching Shear Capacity of Double Layer FRP Grid Reinforced Slabs

Author(s): D.A. Jacobson, L.C. Bank, M.G. Oliva, and J.S. Russell

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 857-876

Keywords: analysis; experiments; FRP; grids; modeling; pultrusion;punching shear; slabs

Date: 10/1/2005

Abstract:
The punching shear capacity of concrete slabs reinforced with three-dimensional fiber-reinforced polymer (FRP) double-layer reinforcement cagescomposed of glass fiber-reinforced pultruded grating elements has been investigatedusing full-scale experimental tests and a number of different analytical models. Testspecimens were full-scale prototype bridge deck slabs with varying end restraint andsupport conditions, differing dimensions, and two different FRP bar fiber lay-ups. Thetests results were compared with the punching shear models in ACI 318, ACI 440,Eurocode 2, BS 8110, CEB-FIB MC90, JSCE, and a number of models proposed in theliterature specifically for FRP reinforced slabs. Based on this investigation a newempirical model has been developed to predict the punching shear capacity of doublelayer grids having either restrained or simply supported edges and including anoverlapping splice. The model is shown to give reasonably good predictions for bothsimply supported and restrained slabs.