Analysis and Design of a G+5 Apartment Building Using ETABS: Geotechnical Investigation, Structural Analysis and Manual Design Verification

• The founding soil at the site was classified as well-graded sand (Cu = 7.72, Cc = 0.99), with an angle of shearing resistance of 29° and a design safe bearing capacity of 169 kN/m², computed using Terzaghi's bearing capacity theory. • The G+5 apartment building, modelled and analysed in ETABS using M20/M25 concrete and Fe550 steel, was found safe under the governing gravity load combinations, with reinforcement ratios within the limits prescribed by IS 456:2000. • Wind and seismic loads did not govern the design of any member for this building height and Seismic Zone II location; gravity load combinations were critical throughout. • Manual verification of a representative slab, beam, column, footing and staircase gave reinforcement quantities of the same order as the ETABS output, confirming the reliability of the software-based design. • The integrated workflow — geotechnical investigation, architectural planning, ETABS modelling and design, manual verification, and AutoCAD detailing — provides a systematic and replicable methodology for the design of similar multi-storeyed apartment buildings. • ETABS was confirmed to be an efficient, accurate tool for the analysis and design of multi-storeyed RC buildings, particularly for rapid evaluation of load combinations and automated code-checking.

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