Modeling procedure of Rigid Strut in Caesar II

Refer my earlier post “A Brief Description of Sway Brace, Strut and Snubber ” for basics of working and the uses of Rigid Struts. This article will explain the step by step methods for modeling the Rigid strut using software Caesar II.
The steps involved in Strut modeling are as follows:
  • Find out the direction in which restriction of movement is required (Assume X direction) and location of the strut installation. For reducing thermal loads to be carried by rigid struts it is preferable to choose thermal null points if feasible.
  • Double click on restraints check box in Caesar spreadsheet and model restraint X with 0 mm gap and with no friction. Keep stiffness K1 box blank.
  • Run Caesar Analysis and found out the force in that node.
  • Enter into any catalogue (like C&P, Lisega etc) and select appropriate rigid strut depending on that force (For your reference strut selection table has been reproduced in Fig. 1 from C&P Catalogue).
  • Obtain the stiffness value for the strut from the catalogue and enter this value in restraint stiffness (K1) which u left blank in initial stage.
  • Run the analysis to obtain results.
Rigid Strut
Fig. 1: Strut Selection Table from C&P Catalogue.
Rigid Struts are used in Turbine and Compressor connected lines near the nozzle connections to take the advantage of very less friction. Otherwise struts can be used as a substitute for guide supports where structure is not available for using standard guides.
Provide your input in comments section

Anup Kumar Dey

I am a Mechanical Engineer turned into a Piping Engineer. Currently, I work in a reputed MNC as a Senior Piping Stress Engineer. I am very much passionate about blogging and always tried to do unique things. This website is my first venture into the world of blogging with the aim of connecting with other piping engineers around the world.

3 thoughts on “Modeling procedure of Rigid Strut in Caesar II

  1. Hi, first of all I am very thankful to you for sharing your knowledge. In your explanation on rigid struts, you have asked to input stiffness of strut in to CAESAR. But the catalogue doesn’t give any stiffness for rigid struts. Is it really necessary to consider stiffness of this rigid arrangement?

  2. Dear Anup,

    Could you please give Caesar input echo sample of calculation using rigid strut and sway.

    Regards,
    Syahrul Harahap

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