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Evaluation of pipe support stiffness and its effect on piping response
T.Y. Chow, C.H. Chen, Ömer Bilgin
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Abstract
In performing stress analysis of nuclear piping systems, support stiffness values are first estimated and used as inputs to predict the responses of the piping systems. However, the actual support stiffness values will not be known until the supports are designed. The difference between the actual support stiffness and that used in pipe stress analysis may introduce changes in the piping response. Therefore, it is desirable to develop simplified criteria to assess the adequacy of the piping system with differences between estimated and actual support stiffnesses. The deviation of the piping response due to support stiffness variations is investigated. The deviations in static and dynamic responses are represented graphically as functions of the support stiffness and its variations. These graphs are useful for deriving the optimum support stiffness and the range of its variation that will bound the piping response deviation within an acceptable limit. 3 refs.