Three-dimensional interaction diagram for the undrained capacity of inverted T-shape strip footings under general loading

This paper presents new solutions of a three-dimensional (3D) interaction diagram for the undrained capacity of inverted T-shape strip footings under general loading. The two-dimensional plane strain finite-element analysis was employed to determine the stability of this problem. Parametric studies were performed to study the interactions of the combined vertical load (V), horizontal load (H) and bending moment (M) that were applied on top of the inverted T-shape footing. The combined action of vertical forces included both tensile (upward) and compressive (downward) loadings. The results of these analyses were summarised in terms of the dimensionless factors for V, H and M. Failure mechanisms associated with different locations on the 3D interaction diagram were compared and discussed. A closed-form approximate solution of the 3D interaction diagram for inverted T-shape strip footings under the V–H–M loading was proposed and compared with the finite-element solutions.

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