Performance Based Seismic Assessment of Asymmetric RC Structure by Pushover Analysis

Abstract: Civil engineering constructions of many types of structures is becoming more distinctive in today's world, much like other engineering products. However, in recent decades, it has prompted concerns about the structural performance under intense seismic activity. In such cases, a nonlinear static pushover analysis can be used to avoid various sorts of structure and life hazard. Pushover study utilizes base shear, roof displacement, and hinge mechanism to examine the building's performance at multiple points. The focus of this research was on the seismic performance of buildings with various symmetric and asymmetric frame structures. Pushover analysis is used in SAP 2000 to identify the nonlinear behaviour of frame elements in the framework. In terms of roof displacement, hinge behaviour, and base shear, the data indicate how different structures behaved. For the same rise construction, asymmetrical structures have higher base shear and roof displacement than symmetrical structures. For seismic analysis of structure is carried out by the Capacity Spectrum Method (CSM) and Displacement Coefficient Method (DCM) according to ATC-40 and FEMA-356, FEMA-440 guidelines respectively. Four different plan asymmetrical models are assumed to understand unique behavioural performances and its seismic assessment.

Keywords: Pushover analysis, Plan irregularity, Demand spectrum, Capacity Spectrum Method, Roof displacement, Hinge behaviour, Base shear, Pushover curve.