Performance based Seismic Design of R.C.C. Building

Abstract

Earthquakes are known to produce one of the most destructive forces on the earth. It can causes loss of life and property and economical loss of the country. Earthquake cannot be prevented, since it is unpredictable, but loss of life of people and damage to the structures can be prevented if later is designed properly. Among various seismic design philosophies exists, Performance Based Design (PBD) of structure is the modern approach to earthquake resistant design. PBD explicitly evaluates how a building is likely to perform, given the potential hazard it is likely to experience, considering uncertainties inherent in the quantification of potential hazard and uncertainties in assessment of the actual building response. PBD is applicable to design of new buildings or retrofit to existing buildings. PBD defines various limit state of performance for the building and hence gives clearcut idea about its performance under hazards that is considered. However, PBD is not to be considered as an alternate to rigorous nonlinear time history analysis. Present study is an attempt to understand PBD of building and its importance in quantifying its performance under considered seismic hazards. The aim of the study is to obtain performance of 3D multistorey building using PBD. Also, assess the performance of the building under different seismic hazards through fragility curves showing probability of exceeding particular limit state due to such seismic hazards. Fragility Curves are generated for building analyzed by PBD as well as nonlinear Time History Analysis, using specified limit states as per ATC-40 and Indian code. Analysis has beeb carried out using ETABS (version 9.5). Fragility Curves obtained for limit state specification on response quantities like peak interstorey drift and peak displacement are generated and reviewed in details, in order to conclude the work. Additionally, a parametric study regarding lateral load pattern to Pushover Analysis, modeling and capacity uncertainty to obtained fragility curves are also included.