Accession Number:

ADA022085

Title:

Three-Dimensional Seismic Structural Analysis of Letterman Hospital.

Descriptive Note:

Final rept.,

Corporate Author:

CONSTRUCTION ENGINEERING RESEARCH LAB (ARMY) CHAMPAIGN ILL

Personal Author(s):

Report Date:

1976-01-01

Pagination or Media Count:

51.0

Abstract:

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. These results are compared with those of a two-dimensional analysis of the hospital performed by Agbabian Associates AA, E1 Segundo, CA, which used time history modal analysis procedures. Overall agreement between the two analyses was good considering 1 The difference in 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 structures static response when subjected to equivalent lateral loadings.

Subject Categories:

  • Seismology
  • Structural Engineering and Building Technology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE