Static versus modal analysis: influence on inelastic response of multi-storey asymmetric buildings |
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Authors: | A Ghersi E M Marino P P Rossi |
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Institution: | (1) Department of Civil and Environmental Engineering, University of Catania, Viale A. Doria, 6, Catania, 95125, Italy |
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Abstract: | The paper investigates the influence of design procedures on the seismic response of multi-storey asymmetric buildings. To
this end, some structures are designed according to methods based on either static or modal analysis, with or without design
eccentricities. The seismic response of these systems is determined by means of inelastic dynamic analyses and the design
is thoroughly examined in order to explain the results of the dynamic analyses. Attention is basically focused on the ability
of design methods to prevent asymmetric buildings from experiencing ductility demands much larger than those of the corresponding
torsionally balanced systems. Numerical analyses underline that while design procedures based on either static or modal analysis
are suitable for the design of torsionally rigid structures only those based on modal analysis lead to the satisfactory performance
of torsionally flexible buildings. Furthermore, the study highlights the qualities of a design method proposed by the Authors.
Its application does not require any explicit calculation of design eccentricities and leads to proper seismic response of
both torsionally rigid and flexible asymmetric buildings. |
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Keywords: | Asymmetry Multi-storey buildings Design methods Static analysis Modal analysis Design eccentricity |
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