NEHRP Clearinghouse
- Title
- Reduction of Overturning Potential of Seismically Excited Structures.
- File
- PB82158494.pdf
- Author(s)
- Huckelbridge, A. A.; Ferencz, R. M.; Shein, S. L.
- Source
- National Science Foundation, Washington, DC., May 1981, 187 p.
- Abstract
- This report summarizes a study of the effects of large overturning moments on the seismic response of structures. In particular, the influence of allowing transient foundation uplift was examined, and more efficient computations methods to treat such localized nonlinearity were incorporated into an existing general analysis program. A variety of commonly used structural types and configurations were studied, including moment frames, braced frames, shear walls, and framed tubes. For the structures examined, transient foundation uplift was found extremely effective in limiting response parameters governed by, or related to, overturning effects. For structures which maintained reasonable levels of ductility demand within the superstructure there was little or no apparent loss in drift control associated with transient uplift. Response parameters not arising from overturning were not mitigated by transient foundation uplift. It was shown that story shears may be attributable to a significant degree to second or even higher mode response. The use of substructuring techniques was shown to be computationally attractive for treating locaiized nonlinearity such as transient foundation uplift.
- Keywords
- Skyscrapers; Earthquake resistant structures; DRAINSUB-2D computer program; User needs; Computerized simulation; Computer applications; Ground motion; Dynamic response; Computer programming; Foundations; Earthuake engineering; Dynamic structural analysis