Overall agreement between the two analyses was good considering: (1) the difference is analysis methods, (2) the numerous instances where engineering judgment was required to idealize the complex structure and compute the required structural properties, and (3) the assumptions inherent in the computer programs. Both analyses, as compared to the original seismic design forces, provide (1) more realistic estimates of the dynamic forces the structure may be expected to resist, (2) the influence of the higher modes on the response of the structure, and (3) the actual distribution of the dynamic forces among the structural members. Furthermore, computing the dynamic response of Letterman Hospital using the response spectrum modal analysis method was not significantly more complex than computing the structure's static response when subjected to equivalent lateral loadings. This report summarizes the results of a three-dimensional seismic analysis of the primary structural elements of Letterman Hospital. Presidio of San Francisco, performed using response spectrum modal analysis procedures. The results of the three-dimensional analysis are compared with the results of a two-dimensional analysis of the hospital performed by Agbabian Associates (AA), El Segundo, CA, which used time history modal analysis procedures.

  • Corporate Authors:

    Army Construction Engineering Research Laboratory

    P.O. Box 4005
    Champaign, IL  United States  61820
  • Authors:
    • Prendergast, J D
    • Choi, C K
  • Publication Date: 1976-1

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 49 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00131686
  • Record Type: Publication
  • Report/Paper Numbers: CERL-TM-M-175 Final Rpt.
  • Files: TRIS
  • Created Date: Jun 5 1976 12:00AM