NEHRP Clearinghouse

Title
Summary of Methodology and Pilot Application.
File
PB294929.pdf
Author(s)
Whitman, R. V.; Biggs, J. M.; Brennan, J.; Cornell, C. A.; de Neufville, R.
Source
National Science Foundation, Washington, DC. Applied Science and Research Applications., October 1973, 64 p.
Identifying Number(s)
['STRUCTURES PUB-381', 'R73-58']
Abstract
This paper describes a procedure called Seismic Design Decision Analysis (SDDA). While the procedure potentially has a broad range of application, this paper focuses specifically upon building code requirements. To illustrate the procedure, a specific design situation was selected; the lateral force requirements for five- to twenty-story apartment buildings in Boston. While both steel and concrete design were considered in the study, this paper discusses the results for reinforced concrete buildings. The general floor and structural layout assumed for the study are illustrated. Shear walls were used to resist lateral forces in the transverse direction while longitudinal forces were resisted by moment resisting frames in the exterior walls. All designs have to resist the wind loading required by the Boston Building Code: 20 psf. Drift requirements under both wind (1/600) and earthquake (1/300) were considered as well as permissible stresses. Masonry block walls were assumed for the exterior walls and interior partitions in accordance with usual practice in Boston. Five different design strategies were considered. Four of these are the requirements for seismic zones, 0, 1, 2 and 3 of the Uniform Building Code, 1970 edition. These requirements differ in the magnitude of the lateral forces required in design and also in requirements concerning reinforcement. The fifth design strategy, designated as superzone S, required lateral forces twice as large as for zone 3. The study was to ascertain which design strategy would be most appropriate.
Keywords
Buildings; Building codes; Earthquake engineering; Boston (Massachusetts); Earthquake resistant structures; Risk; Seismic design; Lateral pressure; Decision making; Massachusetts; Design criteria; Seismic Design Decision Analysis; Wind pressure; Dynamic loads; Seismic risk