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Optimal damper placement in steel frames by the Endurance Time method
Author(s) -
Estekanchi Homayoon E.,
Basim Mohammad Ch.
Publication year - 2011
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.689
Subject(s) - damper , structural engineering , acceleration , nonlinear system , sensitivity (control systems) , engineering , optimal design , genetic algorithm , set (abstract data type) , selection (genetic algorithm) , control theory (sociology) , computer science , mathematical optimization , mathematics , physics , control (management) , classical mechanics , quantum mechanics , electronic engineering , machine learning , artificial intelligence , programming language
Performance‐based optimal seismic design of structures requires repetitive and massive dynamic analyses. In the Endurance Time (ET) method, structures are subjected to specially designed intensifying acceleration functions and their response at various excitation levels is estimated by each single response‐history analysis, thus, significantly reducing the required computational demand. In this paper, the ET method is utilized to acquire optimal placement of viscous dampers in short steel frames with the target of obtaining the desirable performance in two hazard levels simultaneously. In the optimization procedure, the damping coefficients of the added dampers are treated as design variables and assigned such that the total damping coefficients used in the structure would be minimal. Moreover, the performance of the structures before and after damper placement has been evaluated using ground motions. The sensitivity of the results to the selection of a particular set of ground motions is also investigated. Nonlinear models of steel frames have been investigated and the optimization procedures are conducted with genetic algorithm. Recommendations of ASCE/SEI 41‐06 code are followed in setting the performance design criteria. Copyright © 2011 John Wiley & Sons, Ltd.