In this paper the results of a numerical study of reinforced concrete slabs on elastic subgrade with a cavity, are presented. The study is based on the use of a nonlinear finite element code that uses a Lagrangian reinforced concrete plate element, and incorporates the effect of a Winkler subgrade. Consideration has been given to the existence of subgrade cavities and the possible loss of contact between the slab and the subgrade, based on the assumption of a tensionless subgrade. Comparison with an experimental test of a footing without cavity, is given. In addition, new results are presented for several reinforced concrete footings to investigate the effect of the cavity size and location on the capacity of these footings. The results indicate that small cavities have negligible effect on the capacity of the footing, while larger ones reduce the ultimate load and affect the mode of failure. The results also indicate that the location of the subgrade cavity plays a more significant role for stiff subgrades, than it does for weak subgrades.

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