Structural Engineering and Mechanics

  • 제74권5호
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  • Pages.699-709
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  • 2020
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Determination of torsional irregularity in response spectrum analysis of building structures

  • 투고 : 2019.03.24
  • 심사 : 2020.01.21
  • 발행 : 2020.06.10
⟨ 이전 논문 다음 논문 ⟩

초록

Torsional irregularity is one of the most probable types of horizontal irregularity and existence of this irregularity in most of the structural loading codes is determined by calculating the ratio of the maximum to the average story drift. No specific method has been previously recommended by the codes to calculate the mentioned ratio in the response spectrum analyses. In the current investigation, nine steel building structures with different plan layouts and number of stories have been analyzed and designed in order to evaluate the efficiency of three methods for calculating the ratio of the maximum to the average story drift in the response spectrum analyses. It should be noted that one of these methods is the approach used by current version of ETABS software andother ones are proposed in this paper. The obtained results using the proposed methods are compared with the time history analysis results. The comparisons show that one of these methods underestimates the mentioned ratio in all studied models, however, the other two methods have shown similar results. It is also found that the plan layouts and irregularities can affect how these methods estimate the ratios compared to those obtained by the time history analysis. Generally, it can be concluded that all of these methods can properly predict the ratio with acceptable errors.

키워드

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피인용 문헌

  1. Torsional sensitivity criteria in seismic codes vol.21, pp.1, 2020, https://doi.org/10.12989/eas.2021.21.1.001