A comparative study between trapezoidal combined footings and T-shaped combined footings

This work presents a comparative study between two different models: trapezoidal and T-shaped combined footings. The comparative study between trapezoidal and T-shaped combined footings presented in this paper generates results that have an unparalleled accuracy for all foundation engineering problems. The main part of this research is to obtain the optimal area, reinforcing steel, and thickness of the trapezoidal and T-shaped combined footings using the new models. The comparison is made for two trapezoidal combined footings and two T-shaped combined footings of reinforced concrete subjected to the same load. The main findings are: the model for trapezoidal combined footings can be used for rectangular and triangular, and the T-shaped combined footings can be used for rectangular. The structure of the paper is as follows first a very complete state of the art with extensive references that describes the methodology used for the different models clearly, presents different numerical examples, results and at the end conclusions.