• Vaibhav Dhruw,
• Anurag Wahane

The present study examines the seismic performance of a G+11 reinforced concrete (RC) frame building located in Seismic Zone V, emphasizing the influence of out-of-plane geometric irregularity introduced through 3-meter cantilever overhangs. The building, with plan dimensions of 32 m × 16 m and a storey height of 3.0 m, utilizes 450 mm × 550 mm beams and 500 mm × 650 mm columns as part of its lateral load–resisting system. Non-Linear Dynamic Analysis (NLDA) was conducted in ETABS to evaluate the configuration, which includes single-sided cantilever projections (C1) modeled at varying vertical extents—top storey, full height, and ground storey. Key seismic response parameters, including storey displacement, and fundamental time period, were assessed to quantify the impact of this particular irregularity pattern. Results indicate that even a single-sided projection produces noticeable increases in lateral displacement when compared with a regular model, with the full-height C1 configuration showing the highest sensitivity to seismic excitation. The study highlights that out-of-plane irregularities, even when limited to a single side, can significantly influence dynamic behaviour and must be carefully considered in seismic design.

Seismic Response, Displacement, Time period

"EVALUATION OF A HIGH-RISE RC FRAME WITH OUT-OF-PLANE CANTILEVER IRREGULARITY", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 11, page no.f736-f741, November-2025, Available :http://www.jetir.org/papers/JETIR2511607.pdf

"EVALUATION OF A HIGH-RISE RC FRAME WITH OUT-OF-PLANE CANTILEVER IRREGULARITY", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 11, page no. ppf736-f741, November-2025, Available at : http://www.jetir.org/papers/JETIR2511607.pdf