Practical application of equivalent linearization approaches to nonlinear piping systems

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The use of mechanical energy absorbers as an alternative to conventional hydraulic and mechanical snubbers for piping supports has attracted a wide interest among researchers and practitioners in the nuclear industry. The basic design concept of energy absorbers (EA) is to dissipate the vibration energy of piping systems through nonlinear hysteretic actions of EA!s under design seismic loads. Therefore, some type of nonlinear analysis needs to be performed in the seismic design of piping systems with EA supports. The equivalent linearization approach (ELA) can be a practical analysis tool for this purpose, particularly when the response approach (RSA) is also ... continued below

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15 p.

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Park, Y.J. & Hofmayer, C.H. May 1, 1995.

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Description

The use of mechanical energy absorbers as an alternative to conventional hydraulic and mechanical snubbers for piping supports has attracted a wide interest among researchers and practitioners in the nuclear industry. The basic design concept of energy absorbers (EA) is to dissipate the vibration energy of piping systems through nonlinear hysteretic actions of EA!s under design seismic loads. Therefore, some type of nonlinear analysis needs to be performed in the seismic design of piping systems with EA supports. The equivalent linearization approach (ELA) can be a practical analysis tool for this purpose, particularly when the response approach (RSA) is also incorporated in the analysis formulations. In this paper, the following ELA/RSA methods are presented and compared to each other regarding their practice and numerical accuracy: Response approach using the square root of sum of squares (SRSS) approximation (denoted RS in this paper). Classical ELA based on modal combinations and linear random vibration theory (denoted CELA in this paper). Stochastic ELA based on direct solution of response covariance matrix (denoted SELA in this paper). New algorithms to convert response spectra to the equivalent power spectral density (PSD) functions are presented for both the above CELA and SELA methods. The numerical accuracy of the three EL are studied through a parametric error analysis. Finally, the practicality of the presented analysis is demonstrated in two application examples for piping systems with EA supports.

Physical Description

15 p.

Notes

INIS; OSTI as TI95010315

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  • Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995

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  • Other: TI95010315
  • Report No.: BNL-NUREG--61620
  • Report No.: CONF-950740--27
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 67264
  • Archival Resource Key: ark:/67531/metadc704510

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  • May 1, 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 7, 2016, 8:29 p.m.

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Park, Y.J. & Hofmayer, C.H. Practical application of equivalent linearization approaches to nonlinear piping systems, article, May 1, 1995; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc704510/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.