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Earthquakes and Structures
  Volume 21, Number 1, July 2021 , pages 1-10
DOI: https://doi.org/10.12989/eas.2021.21.1.001
 


Torsional sensitivity criteria in seismic codes
Asimina M. Athanatopoulou and Grigorios E. Manoukas

 
Abstract
    Buildings with fundamental vibration mode dominated by torsion are characterized in the literature as "torsionally flexible" or "torsionally sensitive". Given that the seismic behavior of such buildings may be governed by torsion, modern seismic codes prescribe simplified criteria in order to identify them. The objective of the present paper is to evaluate the relevant criteria adopted by four seismic codes. For this purpose, the accuracy of the aforementioned criteria is theoretically investigated with the aid of a well-established analytical criterion based on single-storey one-way asymmetric models. In addition, in order to quantify the shortcomings of some criteria, three illustrative examples are presented. The whole study leads to useful conclusions which contribute to the clarification of some crucial aspects of the torsional seismic response of buildings.
 
Key Words
    irregularity in-plan; radius of gyration; seismic codes; torsional flexibility; torsional radius; torsional sensitivity
 
Address
Asimina M. Athanatopoulou: Department of Civil Engineering, Aristotle University of Thessaloniki, University Campus, 54124, Greece

Grigorios E. Manoukas: Department of Civil Engineering, Aristotle University of Thessaloniki, University Campus, 54124, Greece
 

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