抄録
Presented are inpedance matrices for rigid square foundation on layered media and some numerical aspects for generating these impedance matrices. The analysis method employed is analytically solving wave equations in cylindrical coordinates, and then coordinate transformation, variational principle and reciprocal theorem are used to generate the impedance matrix for structural foundation. Since the interaction stresses between foundation and surrounding soil are assumed to be piecewise constant, the element size for the piecewise constant stress distribution is investigated. In order to demonstrate the reasonability of the assumed element size, some typical distributions of interaction stresses are presented. An example of a rigid square foundation rigidly attached to a two-layer medium and subjected to torsional, vertical, rocking and horizontal excitations is used to show the influence of layered stratum to the impedances.
