Vol.23, No.3 2023, pp. 319–324
UDC:

Nonlinear static analysis of structures has become a profession of structural engineering due to its simplicity and ease. Nonlinear analysis gives more accurate results than linear analysis because inherently all structures have material and geometric nonlinearity. Nonlinear static analysis is a technique which is used to estimate seismic demands of structures under excitation. When lateral loads are applied on structures continuously throughout height of structures, the stiffness of some element in the structure decreases and starts failing. In this paper, there is an attempt to get the performance characteristics of RC buildings using nonlinear static (pushover) analysis. The selected models are rectangular in plan and have varying aspect ratio (H/B). Base width is constant, but height varies accordingly. The aspect ratio varies from 2.03 to 4.03. Some of the critical seismic parameters such as interstorey drift percentage, ductility and stiffness ratio of the building have been analysed and compared. The base shear and roof displacement corresponding to performance point that gives the seismic response of the structure are evaluated using pushover analysis and the results are compared. The performance of the structure is also influenced by aspect ratio. Ductility is more in the high aspect ratio compared to lesser one. The stiffness ratio of a different aspect ratio has been worked with respect to ductility. Complete nonlinear static analysis is done by using default hinges which are in line with the modern code compliant buildings.

Keywords: reinforced concrete building, pushover analysis, aspect ratio, interstorey drift, ductility