Design of boundary combined footings of rectangular shape using a new model

Abstract

This paper presents the design of boundary combined footings of rectangular shape using a new model to consider real soil pressure acting on the contact surface of the footing; such pressure is presented in terms of an axial load, moment around the “X” axis and moment around the “Y” axis to each column. The classic model considers an axial load and moment around the transverse axis applied in each column, and when the moments in two directions are taken into account, the maximum pressure throughout the contact surface of the footing is considered the same. The main part of this research is that the proposed model considers real soil pressure and the classic model takes into account the maximum pressure and uniform is considered. It is concluded that the proposed model is more suited to the real conditions and is more economical.

ABSTRACT: This paper presents the design of combined footings of boundary of rectangular shape using a new model to consider the soil real pressures acting on the contact surface of the footing, these pressures are presented in terms of an axial load, moment around the axis “X” and moment around the axis “Y” to each column. The classic model considers an axial load and a moment around the axis “X” (transverse axis) applied to each column, i.e., the force resulting from the applied loads are located on the axis “Y” (longitudinal axis). The main part of this research is that the proposed model considers the bending moments around the axis “Y” and the classic model neglected the moments around the axis “Y”. Then, the proposed model is more suited to the general conditions and is more economical.RESUMEN: Este documento presenta el diseño de zapatas combinadas de lindero de forma rectangular utilizando un nuevo modelo para considerar las presiones reales del suelo que actúan en la superficie de contacto de la zapata, dichas presiones se presentan en función de una carga axial, momento alrededor del eje “X” y momento alrededor del eje “Y” de cada columna. El modelo clásico considera una carga axial y un solo momento alrededor del eje “X” (eje transversal) aplicada en cada columna, es decir, la fuerza resultante de las cargas aplicadas se localiza sobre el eje “Y” (eje longitudinal). La parte principal de esta investigación es que el modelo propuesto considera momentos flexionantes alrededor del eje “Y” y el modelo clásico no los toma en cuenta. Entonces el nuevo modelo es el más apropiado, ya que se apega más a las condiciones reales y es más económico.