COMPLETE ETABS TUTORIALS: https://www.youtube.com/watch?v=zq0YbxzFN_I&list=PLDyhMW3kzPDAOR0UYuJaFNxv0e3cPlcUH SAP2000 tutorials : https://www.youtube.com/watch?v=RzVVDp1CKE0&list=PLDyhMW3kzPDCDymHF3dplMvKcLRJYPC5F EXCEL SHEET DOWNLOAD : https://www.stuvia.com/doc/560500/mass-irregularity-for-design-of-highrise-buildings Mass irregularity check in etabs tutorial How to check mass irregularity in etabs How to calculate mass irregularity using etabs Compute mass irregularity What is mass irregularity What is weight irregularity What is meant by mass irregularity mass irregularity in structure Mass irregularity meaning Irregular building definition How to avoid mass irregularity Types of horizontal irregularities How to check mass irregularity in building using etabs Weight (Mass) Irregularity: Weight (mass) irregularity is defined to exist where the effective mass of any story is more than 150% of the effective mass of an adjacent story. A roof that is lighter than the floor below need not be considered. Mass irregularity check in etabs Check for mass limit in etabs Check for overturning in etabs How to check overturning in etabs Provision shall be made for the increased forces induced on resisting elements of the structural system resulting from mass due to eccentricity between the center of application of the lateral forces and the center of rigidity of the lateral-force-resisting system. For accidental mass requirements for seismic design Stability against overturning. Every structure shall be designed to resist the overturning effects caused by the lateral forces . Horizontal Mass distorsions Provisions shall be made for the increased shears resulting from horizontal mass where diaphragms are not flexible. The most severe load combination for each element shall be considered for design. The mass design moment at a given story shall be the moment resulting from eccentricities between applied design lateral forces at levels above that story and the vertical-resisting elements in that story plus an accidental mass. The accidental mass moment shall be determined by assuming the mass is displaced . Where mass irregularity exists, the effects shall be accounted for by increasing the accidental mass at each level by an amplification factor Mass irregularity to be considered when diaphragms are not flexible Mass irregularity shall be considered to exist when the maximum story drift, computed including accidental mass, at one end of the structure transverse to an axis is more than 1.2 times the average of the story drifts of the two ends of the structure. How to fix overturning in building Fix mass irregularity How to resolve mass irregularity in building design Calculate weight irregularity #etabs #engineering #design