Nonlinear finite element analysis of punching shear strength of reinforced concrete slabs supported on L-shaped columns
Qing Zhang
Department of Civil and Environmental Engineering (CEE); University of Waterloo; 200 University Avenue West, Waterloo, Ontario; (Canada)
Graeme J. Milligan
gjmillig@uwaterloo.caDepartment of Civil and Environmental Engineering (CEE); University of Waterloo; 200 University Avenue West, Waterloo, Ontario; (Canada)
Maria Anna Polak
Department of Civil and Environmental Engineering (CEE); University of Waterloo; 200 University Avenue West, Waterloo, Ontario; (Canada)
https://orcid.org/0000-0002-1653-3915
Abstract
Most current concrete design codes include provisions for punching shear of reinforced concrete slabs supported on columns with L, T, and cruciform shapes. Reference studies verifying the accuracy of these code provisions are typically not provided. Empirical data of punching failures of slabs supported on columns with L, T, and cruciform shapes are limited due to the cost and time required to test specimens with slab thicknesses and column sizes commonly used in practice. In this paper, the punching shear behaviour of five interior L-shaped slab-column connections, one without a slab opening and four with slab openings, subjected to static concentric loading are analyzed using a plasticity-based nonlinear finite element model (FEM) in ABAQUS. The FEM is similar to models previously calibrated at the University of Waterloo and are calibrated considering nine slabs that are tested to study the impact of column rectangularity on the punching shear behaviour of reinforced concrete slabs. The finite element analysis results indicate that shear stresses primarily concentrate around the ends of the L, and that current code predictions from ACI 318-19 and Eurocode 2 may be unconservative due to the assumed critical perimeters around L-shaped columns.
Supporting Agencies
Keywords:
punching shear, finite element analysis, L-shaped columns, slab openingsReferences
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Authors
Qing ZhangDepartment of Civil and Environmental Engineering (CEE); University of Waterloo; 200 University Avenue West, Waterloo, Ontario; Canada
Authors
Graeme J. Milligangjmillig@uwaterloo.ca
Department of Civil and Environmental Engineering (CEE); University of Waterloo; 200 University Avenue West, Waterloo, Ontario; Canada
Authors
Maria Anna PolakDepartment of Civil and Environmental Engineering (CEE); University of Waterloo; 200 University Avenue West, Waterloo, Ontario; Canada
https://orcid.org/0000-0002-1653-3915
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