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The sum of the overturning moments resulting from seismic loads at the bottom of the walls used in TBDY Articles 4.3.2.3 , 4.3.4.5and 4.3.4.6, M DEV , values according to 4.5.3.7 (d) or 4.5.3.8 (c) for non- gap walls , It is calculated according to 4.5.4.3 for curtains with gaps . The M o value of the total overturning moment occurring at the base from earthquake loads for the whole building is calculated using the 4.8.2 mode combination method described in Annex 4B.2.5 .
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The M o value of the total overturning moment occurring at the base from earthquake loads for the whole building is calculated using the 4.8.2 mode combination method described in Annex 4B.2.5 . In a typical nth vibration mode for the (X) earthquake direction (X) given in accordance with Annex 4B.2.5 , the largest modal base shear force V (X) txn, max and corresponding maximum base overturning moment M ( X) oxn, max Equation (4B.7) is calculated by:
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Below is a sample report where the modal base shear forces and the corresponding base overturning moment are calculated according to TBDY Annex 4B.2.5.
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