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Behavior Of High And Intermediate Frequency Modes Of Structures Subjected To Harmonic Excitation

  • M. Dhileep*
Part of the Springer Proceedings in Physics book series (SPPHY, volume 126)

Dynamic analysis of structures subjected to harmonic and seismic loads shows that the contributions of high frequency modes are essentially static. The modal responses of the structures subjected to harmonic excitation are generally combined using square root of sum of squares (SRSS) rule for well separated modes. The combination of modal response s using SRSS will results in erroneous results for even well separated modes, if the high frequency modes having frequency greater than operating frequency are included. This paper makes an attempt to identify the behavior of the modes which have a frequency greater than the operating frequency. The rigid and periodic part of the response are assumed to be statically independent and the behavior of high frequency and intermediate frequency modes of structures subjected to harmonic loads are studied with the help of an example. The problems involved in using the avaiable modal combination rules in combining the modal responses, when high and intermediate frequency modes are included are discussed.

Keywords

high frequency modes intermediate frequency modes harmonic analysis mode superposition method modal response combination dynamic magnification factor 

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References

  1. 1.
    M. Dhileep, R. B. Pratima, 2006. Effect of Mode Truncation in Structures Subjected to Harmonic Forces: Physical Interpretation, Proceedings of the Tenth Asia Pacific conference on Structural Engineering and Construction, 151– 156, Bangkok.Google Scholar
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    R. W. Clough, J. Penzein, 1993. Dynamics of Structures 2e, Mc-Graw Hill, Singapore.Google Scholar
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    A. K. Gupta, 1992. Response Spectrum Method: In seismic analysis and design of structures,Blackwell Scientific Publications, Boston, Mass.Google Scholar
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    M. Dhileep, S. Nagan, 2002. Synthesis of modes towards the Dynamic Analysis of Turbo Generator Foundations, Power Engineer Journal (Institute of Power Engineers, India), 49, 1– 9.Google Scholar

Copyright information

© Springer Science + Business Media B.V 2008

Authors and Affiliations

  • M. Dhileep*
    • 1
  1. 1.Department of Civil EngineeringRoyal Bhutan Institute of TechnologyRinchending, PhuentsholingIndia

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