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Journal of Applied Sciences
  Year: 2010 | Volume: 10 | Issue: 1 | Page No.: 45-51
DOI: 10.3923/jas.2010.45.51
 
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A Study on the Existence of an Optimal Distribution of Stiffness over the Height of Mid-to High-Rise Buildings to Minimize the Seismic Input Energy

Farzan Haddad Shargh and Mahmood Hosseini

Abstract:
In the Energy Based Design (EBD) of structures Housner's assumption has a primary importance. Based on this assumption the average input energy from earthquakes to a building, modeled as a SDOF system, is related mainly to total mass of the building, having the damping ratio of the building as small as 0.03 and its period of vibration more than 0.4 sec (For smaller periods input energy is function of period also). For higher damping ratios, the maximum energy attained decreases as the damping ratio increases. Thus, mainly the seismic input energy per unit mass of the system is only related to the ground motion characteristics. Housner and Akiyama assumed that the seismic input energy to multistory structures can be estimated by input energy to an equivalent single degree of freedom system. The validity of this assumption was demonstrated experimentally. This study attempts to show analytically the range of validity of these assumptions in linear systems and the possibility of existence of an optimal stiffness distribution over the height of high rise buildings to minimize the seismic input energy. For this purpose it will be shown that from the spectral standpoint, input energy spectra generally is a function of natural period of vibration and if so, input energy is related also to the stiffness of structure, as to the mass, damping ratio and ground motion characteristics.
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How to cite this article:

Farzan Haddad Shargh and Mahmood Hosseini, 2010. A Study on the Existence of an Optimal Distribution of Stiffness over the Height of Mid-to High-Rise Buildings to Minimize the Seismic Input Energy. Journal of Applied Sciences, 10: 45-51.

DOI: 10.3923/jas.2010.45.51

URL: https://scialert.net/abstract/?doi=jas.2010.45.51

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