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changes.mady.by.user Zeynep Aladağ

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Tip

  • Torsion Irregularity Coefficient, which expresses the ratio of the maximum relative displacement at any story to the average relative displacement in the same direction at that story for any of the two earthquake directions perpendicular to each other, is automatically controlled.

Tip

  • The calculation of the relative story drifts is made automatically according to equivalent lateral force method, taking into account the effects of 5% additional eccentricity.

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SYMBOLS

Δavg Δavg = Average reduced relative storey displacement on i'th floor of the building
Δmax Δmax = Maximum reduced relative storey displacement on i'th storey of the building
Δmin Δmin = Minimum reduced relative storey displacement on i'th storey of the building

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1a - Torsion Irregularity

The case where Torsional Irregularity Factor, which is defined for any of the two orthogonal earthquake directions as the ratio of the maximum story drift at any story to the average relative story drifts at the same story in the same direction, is greater than 1.2. Maximum story drift, computed including accidental torsion with Ax =1.0. Torsional irregularity requirements in the reference sections apply only to structures in which the diaphragms are rigid or semirigid.

This type of irregularity affects the Selection of Linear Calculation Method described in Section 12.6 of ASCE 7-16. However, ideCAD Static have already used Linear Dynamic Analysis (Modal response analysis and modal superposition method in time domain) specified in Section 12.9.

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1b. Extreme torsional irregularity

The case where Torsional Irregularity Factor, which is defined for any of the two orthogonal earthquake directions as the ratio of the maximum story drift at any story to the average relative story drifts at the same story in the same direction, is greater than 1.2. Maximum story drift, computed including accidental torsion with Ax =1.0.

Extreme torsional irregularity requirements in the reference sections apply only to structures in which the diaphragms are rigid or semirigid.

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