The effect of torsion on the sliding resistance of rectangular foundations
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The undrained sliding capacity of a shallow foundation on the sea bed under lateral load is one of the key considerations in its design. Lateral loads may arise from combinations of wind, wave, current, earthquake and/or ice loading and from operational loads. A number of offshore structural systems have recently been developed that are founded on rectangular mats. The existence of torsion will reduce the lateral sliding capacity of the foundation. This paper describes a kinematically admissible model, based on plastic limit analysis, that accounts for the effect of torsion on lateral sliding resistance including the interaction among the passive, active, and side shear components of resistance. The relative effects predicted by the model are supported by finite element analyses. It is demonstrated that the torsion effect can play a very significant role in the foundation design. 2011 Taylor & Francis Group, London.
