Seismic Design of Symmetric Structures for Accidental Torsion |
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| Authors: | Silvia L Dimova Ilia Alashki |
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| Institution: | (1) Central Laboratory for Seismic Mechanics and Earthquake Engineering, Bulgarian Academy of Sciences, P.O. Box 27, Sofia, 1582, Bulgaria;(2) Civil engineering and Geodesy, University of Architecture, 112 P.O. Box 18, Sofia, 1712, Bulgaria |
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| Abstract: | The paper presents an analytical estimation of the dynamic effects, caused by the shifting of the centre of mass with accidental
eccentricity in symmetric structures. The approximate analytical solution proves, that even under small accidental eccentricities
the symmetric structures exhibit “irregular behaviour” and the accidental torsional effects cannot be described properly by
static application of torsional moments. The prescribed application rule by Eurocode 8 for multimodal analysis underestimates
the accidental torsional effects up to 21% for 5% eccentricity for the structures considered in the paper. An expression for
the correction of member responses is derived. It is proved by numerical simulations of the dynamic response of three-dimensional
models of symmetric structures, that the proposed correction coefficient gives accurate results in cases of single-storey
and multi-storey structures. It gives a convenient way for the design practice to estimate accurately the accidental torsional
effects on planar and 3-D models of symmetric structures.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | accidental eccentricity correction coefficient for accidental torsional effects Eurocode 8 seismic design of symmetric structures static application of torsional moments |
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