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Nonlinear Boundary Condition Effects for Piping System in the Dynamic Analysis

[+] Author Affiliations
Mohamed I. Abou El-Ella, Anestis Papadopoulos

Plant Design Power Generation Engineering and Services Company (PGESCo.), Cairo, Egypt

Paper No. IMECE2016-66861, pp. V04AT05A044; 11 pages
  • ASME 2016 International Mechanical Engineering Congress and Exposition
  • Volume 4A: Dynamics, Vibration, and Control
  • Phoenix, Arizona, USA, November 11–17, 2016
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5054-1
  • Copyright © 2016 by ASME


Piping system in thermal power plants usually include nonlinear boundary condition (e.g. Single acting and gap supports) to eliminate the high thermal stresses since those systems are operating in high temperature range with large thermal displacement. Using this kind of non-linear supports may include error due to the linear approximation when it comes to study the response of the piping system in the dynamic analysis. Most of the common pipe stress analysis programs such as CAESAR II [1].cannot perform a dynamic analysis for nonlinear systems. This paper is investigating the effect on maximum reaction forces when modelling nonlinear boundary condition using the dynamic analysis module in ANSYS program [2]. The aim of of this paper is to estimate the impact of gaps and to study the effect of different pipe support stiffness. The dynamic analysis is performed for a range of different gap and stiffness support arrangements. The results from the nonlinear analysis are compared with regular linear analysis (supports with zero gaps) and a correlation is established indicating that large spikes in dynamic force are expected when large gaps are included in dynamic analysis. The results of the paper shows that the design engineer must be very caution in using linear dynamic analysis when large gaps are included and that the nonlinear analysis is required when dynamic amplification is significant.

Copyright © 2016 by ASME



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