Punching shear resistance of reinforced concrete footings: evaluation of design codes

Abstract

Punching is a possible failure mode for slender footings and it may lead a structure to ruin through progressive collapse. Although footing present different geometric characteristics, their punching shear design is based on the empirical methods used for flat slabs. This paper uses experimental results from 216 tests to evaluate the performance of design code recommendations presented by ACI 318 (2014), ABNT NBR 6118 (2014) and Eurocode 2 (2010) to estimate the punching shear resistance of reinforced concrete footings. Great dispersion between theoretical and experimental results was observed, being evident that the test system affects the punching shear capacity of footings. The more complex method proposed by Eurocode 2 resulted in a better correlation with experimental results.

Un modelo analítico para el diseño de zapatas combinadas de esquina

“…Studies on foundation structures and mathematical models for footings have been successfully investigated in various geotechnical engineering problems. The main contributions of various researchers in the last decade are: "Behavior of repeatedly loaded rectangular footings resting on reinforced sand" (El Sawwaf and Nazir, 2010); "Nonlinear vibration of hybrid composite plates on elastic foundations" (Chen et al, 2011); "Stochastic design charts for bearing capacity of strip footings" (Shahin and Cheung, 2011); "Modified particle swarm optimization for optimum design of spread footing and retaining wall" (Khajehzadeh et al, 2011); "Design of isolated footings of rectangular form using a new model" (Luévanos-Rojas et al, 2013); "Design of isolated footings of circular form using a new model" (Luévanos-Rojas, 2014a); "Design of boundary combined footings of rectangular shape using a new model" (Luévanos-Rojas, 2014b); "Determination of the ultimate limit states of shallow foundations using gene expression programming (GEP) approach" (Tahmasebi poor et al, 2015); "Design of boundary combined footings of trapezoidal form using a new model" (Luévanos-Rojas, 2015); "New iterative method to calculate base stress of footings under biaxial bending" (Aydogdu, 2016); "A comparative study for the design of rectangular and circular isolated footings using new models" (Luévanos-Rojas, 2016a); "Influence of footings stiffness on punching resistance" (Fillo et al, 2016); "A new model for the design of rectangular combined boundary footings with two restricted opposite sides" (Luévanos-Rojas, 2016b); "Structural design of isolated column footings" (Abdrabbo et al, 2016); "Optimal design for rectangular isolated footings using the real pressure on the ground" (Luévanos-Rojas et al, 2017a); "Experimental and finite element analyses of footings of varying shapes on sand" (Anil et al, 2017); "A comparative study for design of boundary combined footings of trapezoidal and rectangular forms using new models" (Luévanos-Rojas et al, 2017b); "Performance of isolated and folded footings" (El-kady and Badrawi, 2017); "Analysis and Design of Various Types of Isolated Footings" (Balachandar and Narendra Prasad, 2017); "A new model for T-shaped combined footings Part II: Mathematical model for design" (Luévanos-Rojas et al, 2018); "Punching shear resistance of reinforced concrete footings: evaluation of design codes" (Santos et al, 2018); "Soil foundation effect on the vibration response of concrete foundations using mathematical model" (Dezhkam and Yaghfoori, 2018); "Nonlinearity analysis in studying shallow grid foundation" (Ibrahim et al, 2018); "Modeling for the strap combined footings Part II: Mathematical model for design" …”