Eliyar Asgarieh - M.Sc. student, Department of Civil Engineering, Sharif University of technology, Tehran, Iran
Homayoon.E Estekanchi - Associate Professor, Department of Civil Engineering, Sharif University of technology, Tehran, Iran

This study, has focused on 3D structural analysis, using series of preselected records and tries to estimate the average of maximum results by means of simpler methods. ET method is a newly innovated method, which uses some kinds of increasing artificial records. Results gained using ET method in 2D analysis, which have been published in some papers, shows reliability and practicality of the method. In this study, we are going to use ET method as a new, simple and practical method to predict average results of series of records in 3D problems. Several different and major parameters such as stories’ drifts and rotations have been investigated and variations for different degrees have been measured. Analyses have made only for elastic materials. Comparison of ET results and average results of the records shows a satisfactory compatibility.

3D seismic analysis; Scaling method; Endurance Time method; Multi-component dynamic excitation