In the design of shallow foundations normally used in rural buildings on sand, the settlement criterion is more critical than the bearing capacity of the soil. Likewise, it has also been found that widely used methods to estimate the footings settlement on sand, generates differences with the observed in full scale field tests. The aim of this study was to find a new equation based on finite element method (FEM) easy to apply to estimate the footings settlement on sand. This new equation considers the effect of the depth of the founding level, the footing breadth, the equivalent soil stiffness, the Poisson's ratio and the net increase in the effective stress on settlement values. To obtain this equation, a three-dimensional finite element model was generated and subsequently validated using actual footings settlement measured during field tests. The results of settlement predictions extracted from this method are slightly better than those obtained by other methods, but this equation has the advantage of being easier and faster to apply, which implies a savings in computation time.Additional key words: granular soils; rural buildings; shallow foundations; vertical displacement. ResumenNueva ecuación para estimar el asiento de zapatas sobre arenas basado en el método de elementos finitos En el diseño de las cimentaciones superficiales normalmente utilizadas en las construcciones rurales sobre arena, el criterio de asientos es más crítico que el de capacidad de carga del suelo. Igualmente se ha encontrado que los métodos más utilizados para estimar el asiento de zapatas sobre arenas generan diferencias con los observados en ensayos de campo a escala real. El objetivo de este estudio fue encontrar una nueva ecuación, basada en el método de elementos finitos (MEF) fácil de aplicar, para estimar el asiento de zapatas sobre arena. Esta nueva ecuación considera el efecto de la profundidad de cimentación, la anchura de la zapata, la rigidez equivalente del suelo, el coeficiente de Poisson y el incremento neto de la presión efectiva sobre los valores del asiento. Para obtener esta ecuación, se generó un modelo tridimensional de elementos finitos y se validó posteriormente utilizando los asientos reales de zapatas medidos durante ensayos de campo. Los resultados de las predicciones del asiento extraídos de esta formulación son ligeramente mejores que los obtenidos por otros métodos, pero esta formulación tiene la ventaja de ser más fácil y rápida de aplicar, lo que implica un ahorro en el tiempo de cálculo con el ordenador.Palabras clave adicionales: cimentaciones superficiales; construcciones rurales; desplazamientos verticales; suelos granulares. *Corresponding author: ir1ayuje@uco.es Received: 19-04-12. Accepted: 26-09-12.Abbreviations used: Nomenclature: ARE (average relative errors); B, D (footing breadth and depth of founding level); E f , E s (footing and soil stiffness at founding level); E sz , E sinc (soil stiffness at a certain depth and increase of this stiffness per unit of depth); FEM (Finite Element...
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