A quadratic order elastic foundation finite element

A new quadratic order elastic foundation element is presented. It models the vertical subgrade reaction and the shear stiffness of the soil as well as the friction between the super structure and the soil. This element gives the ability to analyze the super structure with the nine-noded quadrilateral plane elements as it has the same quadrature order. Three different applications are analyzed to adapt the accuracy of the new model. All of the results are in good shape.