NEHRP Clearinghouse

Title
Lateral-Torsional Response of Structures Subjected to Seismic Waves.
File
PB83239582.pdf
Author(s)
Wu, S. T.; Leyendecker, E. V.
Source
June 1983, 30 p.
Identifying Number(s)
NBSIR-83-2727
Abstract
The behavior of coupled lateral-torsional systems subjected to seismic waves is investigated analytically. The report presents the numerical results of a parametric study for structures subjected to S-H waves. Case studies are provided to show the contribution of each of the selected parameters to the rotational response of the systems. These parameters are: geometric eccentricity, aspect-ratio of the foundation mat, damping ratio, and the ratio of the rotational to translational frequencies. Dynamic eccentricity is selected as an index to represent the level of the response. The sensativity due to the deviation of the input spectrum is investigated. Accidental eccentricities due to seismic waves are also evaluated. Design concerns are given on how the design eccentricity should be considered based on this study.
Keywords
Dynamic response; Earthquake engineering; Earthquake resistant structures; Seismic design; Structural design; Rotation; Eccentricity; Seismic waves