NEHRP Clearinghouse
- Title
- Linear and Nonlinear Earthquake Responses of Simple Torsionally Coupled Systems.
- File
- PB298262.pdf
- Author(s)
- Kan, C. L.; Chopra, A. K.
- Source
- National Science Foundation, Washington, DC., February 1979, 120 p.
- Identifying Number(s)
- UCB/EERC-79/03
- Abstract
- The effects of torsional coupling on the earthquake response of simple one-story structures in both elastic and inelastic ranges of behavior are analyzed. The structures considered are symmetrical about one principal axis of resistance, resulting in coupling only between lateral displacement along the perpendicular principal axis and the torsional displacement. Torsional coupling arising only from eccentricity between centers of mass and elastic resistance is considered. Systems with several resisting elements, columns and walls are idealized by a single-element model. Responses of such a model to a selected earthquake ground motion are presented for a wide range of the basic structural parameters. The results presented include maximum lateral and torsional deformations of the system as well as maximum deformations of individual columns. It is shown that the inelastic response is affected by torsional coupling to generally a lesser degree than elastic response. Procedures for estimating, to a useful degree of approximation, the maximum responses of elastic and inelastic systems from the corresponding response spectra and the maximum deformations of individual columns from the displacements at the center of mass are presented.
- Keywords
- Earthquake resistant structures; Columns (Supports); Mathematical models; Earth movements; Dynamic response; Buildings; Earthquake engineering; Ground motion; Linear systems; Nonlinear systems; Earthquakes; Dynamic structural analysis