Techno Press

Coupled Systems Mechanics   Volume 6, Number 4, December 2017, pages 417-437
A comparative study for design of boundary combined footings of trapezoidal and rectangular forms using new models
Arnulfo Luevanos-Rojas, Jose Daniel Barquero-Cabrero, Sandra Lopez-Chavarria and Manuel Medina-Elizondo

Abstract     [Full Text]
    This paper shows a comparative study for design of reinforced concrete boundary combined footings of trapezoidal and rectangular forms supporting two columns and each column transmits an axial load and a moment around of the axis X (transverse axis of the footing) and other moment around of the axis Y (longitudinal axis of the footing) to foundation to obtain the most economical combined footing. The real soil pressure acting on the contact surface of the footings is assumed as a linear variation. Methodology used to obtain the dimensions of the footings for the two models consider that the axis X of the footing is located in the same position of the resultant, i.e., the dimensions is obtained from the position of the resultant. The main part of this research is to present the differences between the two models. Results show that the trapezoidal combined footing is more economical compared to the rectangular combined footing. Therefore, the new model for the design of trapezoidal combined footings should be used, and complies with real conditions.
Key Words
    design of trapezoidal combined footings; design of rectangular combined footings; bending moments; bending shear; punching shear
Arnulfo Luevanos-Rojas, Sandra Lopez-Chavarria and Manuel Medina-Elizondo: Institute of Multidisciplinary Researches, Autonomous University of Coahuila,
Blvd. Revolucion No, 151 Ote, CP 27000, Torreon, Coahuila, Mexico
Jose Daniel Barquero-Cabrero: Institute for Long Life Learning IL3, University of Barcelona,
Street Girona No, 24, CP 08010, Barcelona, Spain

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