Evaluation of Endurance Time Analysis in Optimization of Viscous Damper Placement for Seismic Design

Document Type : Structural Earthquake Engineering


1 University of Isfahan

2 Civil Engineering Department, University of Isfahan


Optimal placement of dampers with proper characteristics is the major concern for seismic rehabilitation of structures using these passive devices. In this paper, endurance time method is used to find the optimum placement of dampers in steel frames at different seismic hazard levels. Genetic algorithm is combined with ET method to overcome this optimization problem. Different types of nonlinear modeling are used to validate ETanalysis results. ETacceleration functions used in this study are generated based on ASCE7-05 design spectrum. Results of ETanalysis are compared with the results of time history analysis using seven near-field ground motions spectrally matched to the same spectrum. The Maximum difference between the results of two methods is about 15% in this study, and results of ET analysis are compatible with the results of time history analysis at different hazard levels. Consistency of the results shows that ET method can be used as an effective procedure to optimize damper placement in structures reducing the required computational effort.