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Accidental Torsion

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Dear All,
Due to incoherent vertical seismic waves there is a possibility that structure may experience accidental torsion. How to consider this torsion while designing multistory frames? Theoretically it is to be considered as torsion equal to story shear multiplied by 5% of dimension of structure perpendicular to direction of Earthquake.But in actual how to do the steps to consider it additionally in forces (or shear only) arrived due to seismic analysis.Generally what is the practice?
Regards,
Parag
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