Modeling of Sway Braces in Caesar II for Stress Analysis _ What is Piping

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Modeling of Sway Braces in Caesar II for stress analysis August 2014  14 th August

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  An u p

 Caesar II

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I have have alr  already eady publi p ublished shed a post ex e x p laining the basic b asicss o f  S way Bra Braces ces in m y e arlier posts. Clic Click k here to here  to visit vi sit it it again.. In this article I will ex plain the procedure for again modeling Swa Sway y Braces in Caesar Caesar II. As I hav e mentioned already that Sway b races are spring (pre-loaded) loaded u nits to limit the swaying swaying or v ibration induced induced by  external forces by applying an opposing opposing force on the pipe. The sway brac e is simulated by use of bi-linear bi-linear restraint available in CAESAR II. It will be discussed in the following section.

Note: Refer this article along with the earlier article on Sway Brace for proper understanding.

Modeling in Caesar Caesar I I: The steps involved in modeling a sway brac e in Caesar Caesar are as follows follows::

*

Select the sway brace from catalogue depending on given pipe nominal diameter or depending on the

force calculated to restrain the pipe work. (Fig. SB45 as per C&P catalogue, reproduc ed in Fig. 1)

Fig.1: Sway Brace se lectio n Table from C&P Catalogue . *

Mark a node (Node 1 0-Fig.2) at the location in the piping system where sway brace will be installed. Run

Caesar analysis and note down the displacement of the po int in specified direction from cold to operating condition. For the sake of ex ample, let’s assume that CAESAR II calculated displacement from cold to operating position is 0.5 inch in +X direction. *

Now in CAESAR II input spread sheet (See Fig. 2) chec k the restraints box and define bi-linear restraint

(X2 for the assumed c ase) at Node 1 0 with CNode at 1 01 . Here, K1 is the initial stiffness of a bi-linear restraint. Do not enter anything on this c ell as the restraint is assumed to be rigid. The v alue of K2and Fy to  be ob tained fro m c ata lo gue . Wher e, K2 = Po st y ield st iffness of a b iline ar r est raint. When the load o n the support restraint exceeds Fy then the stiffness on the support restraint changes from K1 to K2. Fy = Y ield Load. If the load on the support restraint is less than “Fy” then the initial stiffness K1 is used. If the load on the support restraint is greater than “Fy ” then the second stiffness ” K2″ is used. *

Define restraint X at node 10 with CNode at 10 1. Prov ide a gap of 3 inch (=distance the sway brac e is

able to mov e in both positive and negative direction before it gets loc ked/ become fully rigid depending on manufacturer= 3 inch as per C&P catalogue) *

Check the displacement box and define the displacement for Node 10 1. I t is the displacement for node

10 as noted earlier (0.5 inch in X direction, leave other cells i.e., DY, DZ, RX, RY, RZ blank.). *

Add D2 in sustained and operating load cases. Now run the analysis to obtain results.

Fig. 2: Caesar II Spread sheet for Sway brace modeling.

Provide y our inputs in comments column

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