A Review - Fragility Analysis of Multi-Storey Regular R.C Building

Abstract

The uncertain nature of future ground motions is leading to the development of probabilistic structural damage estimation procedures. The fragility curve method is a useful method for estimating the structural damage for certain type of structure under the effect of potential earthquakes. Earthquake response analysis is basically done either by non-linear static procedure or non-linear dynamic procedure. Non-linear static procedure may or may not be based on record to record variability, however non-linear dynamic procedure are based on record to record variability. Based on structural response results the two parameters mean and standard deviation are obtained for development of fragility curve. Keywords: Non-linear static procedure, non-linear dynamic procedure, record to record variability, probabilistic structural damage, fragility curve I. INTRODUCTIONOver the past 40 years, major changes regarding seismic design procedures have occurred. Historically, seismic design procedures were based primarily on forces and the strength necessary to resist them largely because that is what dead and live loads are traditionally designed for. It was believed that the strength of a structure was synonymous with the performance of a structure. Research conducted during the 1970's and 1980's focused on determining the ductility of structural systems and incorporating this into the design requirements, but the overall design methods were still based on resisting forces. In the 1990's, a new design method based on desired levels of displacements, instead of forces, was introduced and has been the focus of research since then. The new design method, referred to as performance-based design, was developed to overcome shortcomings in the previous force-based design methodology. Through history, we had recognized that earthquakes caused in big disasters to structures which hadn't any elements to resist the horizontal force produced from earthquakes. There is a concept in the design of structures that was seismic design concept based primarily on forces and the strength necessary to resist them largely because that is what dead and live loads are traditionally designed for. So, there was a need for developing the field of design for structures which will be subjected to lateral load specially earth quakes loads. For analysis of structures subjected to seismic loading, methods such as static and dynamic methods came into existence which could be performed on varied software such sap2000,ansys etc. Further, to estimate the probabilistic damage in structure, damage states are defined and fragility curves are designed on basis of certain ground motion parameters. Fragility curve is one of the novel methods to analyze the probability of yielding or failure of structures thus simplifying seismic analysis.