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The IUP Journal of Structural Engineering :
Inelastic Analysis of Reinforced Concrete Frames
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Buildings designed in accordance with the present seismic codes sustained large damages or collapsed during strong earthquakes, raise the question about the adequacy of seismic codes. This experience has forced the engineers engaged in design practice to focus on the predictive methods of design with predefined performance objectives. The Performance-Based Seismic Design (PBSD) has emerged as the best alternative that addresses multiple-level structural performances for the stated set of imposed seismic demands. This paper focuses on the assessment of the seismic performance of gravity-based design structure subjected to various lateral load patterns. Fourteen example MRFs designed as per IS: 456 (2000), IS: 1893 (2002), and IS: 13920 (1993), were subjected to the displacement-controlled pushover analysis. This example MRFs represent low-rise structures, located in seismic zone V, on the medium soil type with importance factor equals to 1. The parametric study includes: base shear, storey displacement, inter-storey drift and plastic hinge mechanism. Based on the study, a damage indicator is proposed which gives a measure of energy dissipated by the MRFs.

 
 

Among all natural forces, earthquake is a more destructive and distributive force, causing the greatest damage to Reinforced Concrete (RC) structures. The present seismic codes such as IS: 1893 (2002) were found to be deficient to meet the requirements for such inelastic deformations resulting in seismic loads. The buildings designed based on this code were severely damaged or collapsed during strong earthquakes, which raised the questions about the adequacy of the seismic codes. The prescriptive methods of seismic design have provided various limit states, based on stresses and member forces to satisfy the objectives, so as to provide for life safety (strength and ductility) and damage control (serviceability drift limits) from prescribed levels of applied lateral force (Zameeruddin and Sangle, 2016).

With an aim to communicate the safety-related decisions, the design practice is now focused on the predictive method of assessing potential seismic performance, known as Performance-Based Seismic Design (PBSD). PBSD is a generalized design philosophy, in which design criteria are expressed in terms of achieving the stated performance objectives when the structure is subjected to the stated levels of seismic hazard (Ghobarah, 2001). PBSD permits the design and construction of buildings with a realistic and reliable understanding of the risk to life, occupancy and economic loss that may occur because of future seismic events (Hamburger et al., 2004).

 
 

Performance-Based Seismic Design (PBSD), Example MRF, Pushover analysis, Parametric study, Damage indices.