Soil site classes and seismic zones are the integral parts of building design. During the earthquake, the
effect of local soil site conditions with zone coefficient plays an important role in building vulnerability.
The Bangladesh National Building Code (BNBC-2020) recommends the guideline for design response
spectrum to reduce the vulnerability during the seismic activity. The seismic performance level of the
buildings was estimated by using the Capacity Spectrum Method (CSM) and compared with the results
of nonlinear pushover analysis. Two maximum inter-story drift ratios of 0.5% (1/200) and 0.4% (1/250)
are used to determine building performance levels and compare it with code limitation allowable story
drift. The site classification is usually conducted using average shear wave velocity 𝑉𝑆
̅ if available.
Otherwise, the value of 𝑁̅ may be used for site classification. In this study, 160 boreholes locations
were subjected to determined average N-SPT(N30) values based on soil properties up to 30m of site
profile as per BNBC-2020. It has been observed that the two model buildings having the limited drift
angle of 1/200, are only operational in soil site classes SB and SC with a Peak Ground Acceleration
(PGA) up to 0.12g. On the other hand, in both drift angles, these buildings in soil classes SB, SC, and
SD with a higher PGA than 0.12g are not operational. This paper presents the maximum seismic
performance level, for example, Operetional (OP), Immediate Occupancy (IO), Damage Control (DC),
Life Safety (LS), and Collapse Prevention (PC), of the two model buildings located in the different site
classes (SB, SC and SD) of four seismic zones. Therefore, the evaluation results of the building
performance levels for the lower drift angle (1/250) are more resilient than the higher one (1/200).
Keywords: Drift angle, N-SPT (N30), Response spectrum, Performance level, Site class.