A three-node curved isoparametric soil interface element is presented
that models the vertical subgrade reaction and the shear stiffness of
the soil, and the friction between the soil and the superstructure. Th
e element is compatible with curved eight-or nine-noded isoparametric
plane elements. It can be used to analyze planar structures on elastic
media. Two verification problems, a curved shell on elastic foundatio
n and a circular culvert under concentrated load, are given. Results a
re compared with both theoretical analysis and finite element analysis
using a conventional beam on elastic foundation formulation. (C) 1997
Elsevier Science Ltd.