Selection of best models for load-carrying capacity of square column foundations

In this paper, a simplified strut-and-tie model for the prediction of the load-carrying capacity of a prismatic RC column foundation with a square cross-section is presented. Several subgrade contact pressure distributions for column foundations were considered. The flexibility of the foundation was also considered in the use of a strut-and-tie model. A detailed background of existing models for prediction of the load-carrying capacity of a flexible and rigid foundation was presented. The aim of the paper was the choice of the best model (strut-and-tie or cantilever beam/two-way slab model) to safely predict the load-carrying capacity of a single column foundation including the variation in the type of soil. Available experimental data were utilized to verify the model in comparison with existing models.