PERFORMANCE BASED SEISMIC DESIGN OF G+6 STOREY BUILDING

Abstract

In recent years, emphasis has changed from strength to performance for design of seismic resistance structures. Strength and performance were considered as synonyms and recently it is realized that increasing strength may not enhance safety or necessarily reduce damage. So, Performance-based design is needed for change in the design process because although buildings designed using codes had performed well during the earthquakes from a life safety point of view but the level of damage of structures and economic losses due to loss of use and cost of repair were extremely high. A Performance based design is based upon accurate estimations of different response parameters. It is emphasized on limit state design, which is termed as Performance Based Engineering. Designing of a structure in a way to reduce damage during an earthquake makes the structure uneconomical, as the earthquake is a rare natural phenomenon which might or might not be occurring during the building’s lifetime. The main reason for the occurrence of the earthquakes is movement of Tectonic Plates noticed as ground motion. These ground motion at any site depends upon magnitude, focal depth, epicentral distance, characteristics of the path of seismic waves and soil strata on which the structure is build. Structures are designed using current seismic design codes which are mostly based on Force Based Design approach. The initial aim of the current codes is the public safety. However, no clear information is provided regarding economic losses and business interruptions or downtime. Some information about damage states of structural components is provided, but very limited information is given for the damage states of non-structural members and content systems. Performance-Based Seismic Design (PBSD), which is a new concept in seismic design of structures, is a reliable approach capable of providing more detailed information on the performance levels of both structural and non-structural elements. In this report performance-based design of G+6 Building is studied in an active seismic zone. The building is designed in software SAP2000 & its various parameters such as Displacement, Stresses, Drift due to lateral forces are estimated as per IS-1893-2016.