Accidental torsion in buildings due to stiffness uncertainty

de la Llera, Juan Carlos; Chopra, Anil K.


Discrepancies between the computed and actual values of the structural element stiffness imply that a building with nominally symmetric plan is actually asymmetric to some unknown degree and will undergo torsional vibration when subjected to purely translational ground motion. Such accidental torsion leads to increase in structural element deformations which is shown to be essentially insensitive to the uncoupled lateral vibration period of the system but is affected strongly by the ratio of uncoupled lateral and torsional vibration periods. The structural deformations increase, in the mean, by at most 10 and 5 per cent for R/C and steel buildings, respectively, and by much smaller amounts for a wide range of system parameters. The increase in structural deformations due to stiffness uncertainty is shown to be much smaller than implied by the accidental torsional provisions in the Uniform Building Code and most other building codes.

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Título de la Revista: Earthquake Engineering & Structural Dynamics
Volumen: 23
Número: 2
Fecha de publicación: 1994
Página de inicio: 117
Página final: 136
Financiamiento/Sponsor: National Science Foundation. Grant Number: BCS‐8921932


Notas: WOS Core Collection ISI