PROPOSED METHOD FOR DEVELOPING CODE 2800 COMPLIANT ENDURANCE TIME METHOD FOR SEISMIC DESIGN AND ANALYSIS OF BUILDINGS

The main purpose of seismic design regulations is to create a suitable margin of safety for the building against damage during strong earthquakes. Development of computational facilities and advanced application of new methods for dynamic analysis has advanced in recent years. In endurance time method the intended structure is subjected to an intensifying acceleration function with predesigned specifications and its performance is assessed based on the time that it can endure the intensifying excitation based on specified criteria at each intensity level.This method reduces considerably the number of analysis required to complete conventional dynamic methods and paves the way for the use of time history based analysis and assessment in seismic design of structures. In this article, acceleration time functions corresponding to code 2800 are generated and calibrated and their usability in analysis of the regular and irregular frames has been investigated. The results indicate compatibility of endurance time analysis with standardized static and spectral analysis in the range of linear behaviour.Application of the method as a dynamics analyze alternative has been explained. Flow chart for using endurance time method in seismic analysis of structures is presented.