Structural Design of G+3 RCC Building as per IS Standards Using ETABS

A: Governing principle: Ultimate limit state axial load uses factored combinations per IS 456. Applied here: (350+200) kN per floor × 4 floors × 1.5 gives 3,300 kN at column base. Distractor D traps engineers who drop the roof level without checking whether roof live load is specified as zero in the loading schedule.

A: Governing principle: Design inputs must be consistent across controlling documents. Applied here: Slab thickness drives dead load, stiffness, and seismic mass, so reconciliation is mandatory before acceptance. Distractor B catches engineers who treat software output as authoritative without configuration control.

A: Governing principle: Seismic analysis is sensitive to mass and stiffness distribution per IS 1893. Applied here: A shifted mass centroid induces torsion even in symmetric frames, inflating column moments. Distractor C appeals to those mixing gravity load logic into dynamic analysis where it doesn’t apply.

A: Governing principle: Dead load equals material density times thickness. Applied here: 0.15 m × 25 kN/m³ gives 3.75 kN/m² before finishes. Distractor C traps those who silently add finishes without checking the loading definition.