NONLINEAR STATIC PUSHOVER ANALYSIS OF A MULTI-STOREY RC FRAME USING ANSYS

Abstract

This work does a nonlinear static pushover analysis of a multi-storey reinforced concrete (RC) frame utilizing ANSYS to assess its seismic performance. The main goal is to look into how the structure behaves when lateral loads are given in small amounts, just as an earthquake would. We create a three-dimensional RC frame model with the right material attributes, boundary conditions, and loading patterns. The examination looks at the structure's overall performance levels, load–displacement behavior, capacity curve characteristics, and the creation of plastic hinges. The results show that the structure behaves elastically when it is first loaded, but then it responds nonlinearly because its stiffness decreases and hinges form. Most structural elements are in the Immediate Occupancy and Life Safety performance levels, which means they work well in moderate seismic circumstances. However, the presence of plastic hinges in lower-storey columns at elevated load levels indicates possible susceptibility to intense earthquake stresses. The study shows how important nonlinear analysis is for understanding how structures respond and making seismic design better. It determines that the structure is safe for design-level earthquakes, although it may need more reinforcing to make it more resistant.