Volume 4, Issue 2 (12-2019)                   NMCE 2019, 4(2): 36-43 | Back to browse issues page


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Davarnia D, Farahmand Azar B. A New Method for Estimating the Input-Energy of MDOF Structures. NMCE 2019; 4 (2) :36-43
URL: http://nmce.kntu.ac.ir/article-1-253-en.html
1- University of Tabriz, Tabriz, Iran. , Daniel.Davarnia@tabrizu.ac.ir
2- Associate Professor, University of Tabriz, Tabriz, Iran.
Abstract:   (545 Views)
Input-energy is the amount of energy that is imposed by an earthquake on a structure and its correlation with structural damage has been studied and demonstrated by many researchers. Since studies concerning seismic energy in multi-degree-of-freedom systems are relatively limited compared with single-degree-of-freedom, in this paper, firstly a theoretical exact method is discussed to calculate the input-energy of the multi-degree-of-freedom elastic oscillators. It is proved that unlike the general rule in mechanics, the superposition theorem is valid for input-energy in conventional modal analysis. To estimate the input-energy, an approach based on PHSA to predict the Fourier amplitude spectrum, is proposed. The results indicate that the modal mass ratio is not the only decisive parameter in input-energy. Modal input-energy decomposition also confirms the possibility of greater input-energy of higher modes in comparison with fundamental ones or the ones with the higher mass participation ratio, especially for tall buildings located in the near-field seismic zones.
Full-Text [PDF 1005 kb]   (388 Downloads)    
Type of Study: Research | Subject: General
Received: 2019/09/6 | Revised: 2019/11/10 | Accepted: 2019/12/1 | ePublished ahead of print: 2019/12/15

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