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Journal of Applied Sciences
  Year: 2008 | Volume: 8 | Issue: 22 | Page No.: 4029-4039
DOI: 10.3923/jas.2008.4029.4039
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The Effect of Vertical Component of Earthquake on Seismic Response of Torsionally Coupled Systems

M.F. Nezamabadi, A.S. Moghadam and M. Hosseini

A compendium of field observations in recent years in near field as Northridge (1994), Kobe (1995), Turkish (1995), Athens (1999), Bam (2003) and past analytical investigations have shown that the vertical component have significant effect in creating seismic damage. Also assessment of structural performances during past earthquakes demonstrates that plan irregularity, due to asymmetric distribution of mass, stiffness and strength, is one of the most frequent sources of severe damage. In this study the effects of vertical component of earthquake motion, acting simultaneously with horizontal component on the structures with asymmetric distribution of mass have been studied. A simple lumped-mass model of a single storey building resting on a rigid foundation with 4 degrees of freedom; the lateral displacement, the torsional displacement, the vertical displacement and the rotational displacement about lateral axis has been developed and displacement responses have been evaluated subjected to horizontal, torsional, vertical and rotational motions. The mass of diaphragm has been assumed to act at an eccentricity (e) from the center of resistance about x-axis and z-axis. It has been concluded that the influence of higher values of eccentricity ratio is to increase horizontal and vertical responses for smaller frequency ratio values. Increasing rate of vertical response due to eccentricity is reduced with decreasing frequency ratio values. Vertical response is very sensitive to the vertical frequency ratio values. For smaller vertical frequency ratio values, the response is much higher when the translational natural period of uncoupled building is greater than 1.2 sec.
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How to cite this article:

M.F. Nezamabadi, A.S. Moghadam and M. Hosseini, 2008. The Effect of Vertical Component of Earthquake on Seismic Response of Torsionally Coupled Systems. Journal of Applied Sciences, 8: 4029-4039.

DOI: 10.3923/jas.2008.4029.4039






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