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Articles by A. Nicknam
Total Records ( 2 ) for A. Nicknam
  A. Nicknam
  he main objective of this article is to demonstrate the ability of our technique in estimating the probabilistic-based time-history to be used in dynamic analysis of structures. The result of using our technique is compared with that of traditional approach proposed by Cornell (Cornell, 1968), in the form of response spectrum through a case study. Good agreement of the two approaches confirms the applicability/reliability of our technique having the merit of being dynamic form to be used in recognizing the vulnerability as well as performance evaluation of exiting important structures particularly in regions with lack of destructive earthquake information such as the region under study, Arge-Bam which was highly damaged through the destructive Bam earthquake in 2003.
  A. Nicknam , R. Abbasnia , M. Bozorgnasab and Y. Eslamian
  The main objective of this study is to simulate the acceleration time histories of May 28, 2004 Kojour earthquake (Mw 6.2) happened at Northern part of Iran. The uncertainties inherently exist in the seismological parameters are reduced to find the suitable parameters for synthesizing process. The hypocenter location, focal mechanism and the causative fault dimensions are some of the parameters, studied in this article. The Empirical Green’s Function method approach along with a genetic algorithm technique is used to optimize the differences between synthesized ground motions and observed data and consequently to extract the aforementioned seismological source parameters. The proposed technique is utilized by comparing the elastic response spectra corresponding to the synthesized three components of the main event at Poul station and those of the recorded data. Thereafter, to find out the accuracy of the method, using the estimated source parameters from the approach, the Empirical Green’s Function method is utilized to generate the three components of strong motion recorded at another station, Noshahr. Proper match of the synthesized and observed data confirms the suitability of selected model parameters and the efficiency of the method for synthesizing ground motions. Also, the three components of acceleration time histories of the mainshock were predicted at another station, Baladeh, at which the main event was not recorded during the earthquake. The proposed approach can be used to find the acceleration response spectra and also time histories that are compatible with those response spectra for studying structural behavior during happened earthquakes in the regions with lack of recorded time histories.
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