2010 Volume 66 Issue 1 Pages 126-144
A simple method to calculate the distribution of contact pressure and displacement at the basement of spread foundations is proposed in this paper. The foundations focused in this paper are symmetrical with the center axis, and consists of rectangular shape foundations. Generally speaking, uneven displacement including partial gap of the basement of spread foundation by the effect of dynamic interaction becomes a severe issue when earthquake occurs, that is lateral large force must be considered in the design. Although conventional methods assume an ideal fixed or pin-structured mechanical bearing on the contact surface between foundation and base ground and require troublesome iteration, the proposed calculation method in this paper is based on a rocking-sway model which is a mechanical system of one degree of freedom and is easily applicable to rather complicated shape foundations. Moreover three dimensional FEM is carried out for a single rectangular shape foundation, and the reliability of the proposed method is evaluated by the comparison with the analytical results.
