Approach for Selection of Rayleigh Damping Parameters Used for Time History Analysis

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Nonlinearities, whether geometric or material, need to be addressed in seismic analysis. One good analysis method that can address these nonlinearities is direct time integration with Rayleigh damping. Modal damping is the damping typically specified in seismic analysis Codes and Standards. Modal damping is constant for all frequencies where Rayleigh damping varies with frequency. An approach is proposed here for selection of Rayleigh damping coefficients to be used in seismic analyses that are consistent with given Modal damping. The approach uses the difference between the modal damping response and the Rayleigh damping response along with effective mass properties of the ... continued below

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Spears, R. E. & Jensen, S. R. July 1, 2009.

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Nonlinearities, whether geometric or material, need to be addressed in seismic analysis. One good analysis method that can address these nonlinearities is direct time integration with Rayleigh damping. Modal damping is the damping typically specified in seismic analysis Codes and Standards. Modal damping is constant for all frequencies where Rayleigh damping varies with frequency. An approach is proposed here for selection of Rayleigh damping coefficients to be used in seismic analyses that are consistent with given Modal damping. The approach uses the difference between the modal damping response and the Rayleigh damping response along with effective mass properties of the model being evaluated to match overall system response levels. This paper provides a simple example problem to demonstrate the approach. It also provides results for a finite element model representing an existing piping system. Displacement, acceleration, and stress results are compared from model runs using modal damping and model runs using Rayleigh damping with coefficients selected using the proposed method.

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  • 2009 ASME Pressure Vessels and Piping Division Conference,Prague, Czech Republic,07/26/2009,07/30/2009

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  • Report No.: INL/CON-09-15474
  • Grant Number: DE-AC07-99ID-13727
  • Office of Scientific & Technical Information Report Number: 963743
  • Archival Resource Key: ark:/67531/metadc931470

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  • July 1, 2009

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Jan. 4, 2017, 2:18 p.m.

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Spears, R. E. & Jensen, S. R. Approach for Selection of Rayleigh Damping Parameters Used for Time History Analysis, article, July 1, 2009; [Idaho]. (digital.library.unt.edu/ark:/67531/metadc931470/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.