Seismic performance and assessment of RC framed structure with geometric irregularities

Abstract

Over the few decades, irregularly shaped structures have become famous in modern times because of their architectural significance. Symmetrical plan structures often exist, although irregular plan structure is practiced in developing nations. This study investigates the effect of geometric irregularity in reinforced concrete (RC) frame structures under seismic zone IV using the software STAAD Pro. Moreover, the time displacement on the nodes from where the geometric irregularity starts has been analyzed. Three types of 8-storey’s frame models were considered for the dynamic behaviors, i.e., models M1, M2, and M3. Model M3 is geometrically regular in the x–y-plane, and geometric regularity is interrupted in models M1(less disturbed) and M2 (more disturbed) in the identical plane. The results showed that the time displacement is more geometrically irregular structures. The time frequency increases in each mode, which means the higher method has a higher frequency and more in a more geometrically rare form. The irregularity of the structures' geometricity is reflected in the irregularity shape factor (ISF). According to the finding, the rough geometrical shape significantly impacts the dynamic response of the building, and ISF of 0.26 (M2) and 0.24 (M1) greatly varies with frequency, period, velocity, acceleration, and displacements.