NEHRP Clearinghouse
- Title
- Elastic Analysis of Pilot Building. Internal Study Report Number 14.
- File
- PB80127707.pdf
- Author(s)
- Whitman, R. V.; Anagnostopoulos, S.
- Source
- National Science Foundation, Washington, DC. Engineering and Applied Science., August 1972, 14 p.
- Abstract
- The pilot building for the optimum seismic protection study is a 13-story steel frame building. In order to understand the reasons for the odd behavior of this building (increasing the strength and stiffness of this very flexible building generally led to a decrease in the strength of the earthquake that would cause yielding in the building, as indicated in an earlier study), this report presents a number of results from the elastic analysis of the building including discussions on: ideal building (uniform properties, strength proportional to stiffness) with smooth response spectrum input; actual building with smooth response spectrum input; and actual building with time-history input. Three main conclusions are as follows: (1) for very flexible buildings, only modest increases in yield acceleration can be achieved by stiffening of the building; (2) unless actual designs are checked by dynamic analysis (and then redesigned), there may be considerable variation in the resistance of the designs; (3) analysis using a single time-history, even an artificial time-history for a smoothed response spectra, can introduce considerable variation in yield displacement. The time-history used for analysis of the pilot building is not adequate for very flexible buildings.
- Keywords
- Steel construction; Earthquake resistant structures; Seismic waves; Elastic analysis; Buildings; Earthquake engineering; Soil structure interactions; Earthquakes; Dynamic structural analysis