Abstract—The Design and Construction of Buildings are done according to the prevalent codes of the locality. As the society evolve, so does the codes. In Nepal, the transition from the use of IS codes to the use of NBC has eased the sector of building construction. Although these codes to some extents are similar, greater portion of these codes remain distinct. This paper intends to differentiate between these codes with clarity. The differences in design and analysis between NBC 105:1994 ,NBC 105:2020 and IS 1893:2002, as considered by ETABS Ultimate 21.0.0 software, is presented in this article comparing the design results of parameters story displacement, story drift ratio, base shear, story shear, floor acceleration, overturning moment, torsional irregularity, moment diagrams and shear diagrams under the application of seismic load for the soil type found in Kathmandu Valley region as per the distinct code provision. From the comparison results, it shows that the IS 1893:2002 and NBC 105:1994 show almost similar results for base shear, story displacement, story drift ratio, story shear, overturning moment, floor acceleration due to the similarity in their derivation and assumption. But the results obtained from NBC 105:2020 is majorly different, the variation of results obtained from this code is more than 2 times than that of the IS 1893:2002 and NBC 105:1994 for all design parameters.

Keywords—building codes, NBC 105:1994, NBC 105:2020, IS 1893:2002, ETABS, seismic provisions, RC frame, G+8 RC frame

Cite: Er. Jeevan Gwaccha, Aakash Pokharel, Abhishek Khatri and Farhan Ansari, "Comparative Analysis of NBC 105:1994, NBC 105:2020 and IS 1893:2002 Seismic Codes with G+8 RC Building," International Journal of Structural and Civil Engineering Research, Vol. 13, No. 3, pp. 96-107, 2024.