An effective procedure for the earthquake analysis of linear structure-foundation systems, idealized as an assemblage of two-dimensional finite elements, is developed. The procedure utilizes a substructure approach. The foundation is analyzed first, independently of the structure, to obtain its frequency dependent compliance characteristics at the connection nodes with the structure. Equations of motion for the structure are then written in the frequency domain incorporating the effect of the foundation. The substructure approach allows a more detailed modeling of the structure, at the some time resulting in a greater flexibility in the selection of the analysis procedure for the foundation and a greater efficiency in numerical computation. The frequency dependent equations of motion for the structure are solved very efficiently by transformation to a generalized coordinate system (Ritz Method), where a few generalized shapes can adequately express the structural response.

  • Corporate Authors:

    American Society of Civil Engineers

    345 East 47th Street
    New York, NY  United States  10017-2398
  • Authors:
    • Vaish, A K
    • Chopra, A K
  • Publication Date: 1974-12

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00265656
  • Record Type: Publication
  • Report/Paper Numbers: ASCE 10990
  • Files: TRIS
  • Created Date: Feb 27 1975 12:00AM