Accidental Torsion

Owned by İsmail Hakki BESLER
Last updated: Oct 28, 2022 by Zeynep Aladağ
1 min read

  • As required by Codes, the earthquake calculation is made automatically in every 4 cases by shifting the storey masses by 5%.

  • In accordance with Codes, the horizontal earthquake loads are calculated automatically by shifting (+) and (-) 5%.

  • In modeling accidental torsion, any of the static and dynamic methods that comply with the regulation can be used for analysis. Method selection is controlled by users.

International Design Codes

ASCE 7-16 : Accidental Torsion per ASCE 7-16 with ideCAD

TSC 2018 : Additional Eccentricity Modelling

Horizontal earthquake loads affecting the floor mass center or nodes is shifted by +5% and -5% of the floor dimension perpendicular to the earthquake direction considered, and earthquake calculation is also made for these cases.

Accidental torsion is a building-code requirement for both regular and irregular structures, since uneven distribution of live-load mass during lateral loading and variation between computed and actual values of structural properties.