Calculation of anchor reaction load

Hi,

We at our office are using In house developed software for pipe stress analysis. The anchor reaction loads are calculated based on dead weight and thermal loads.

These thermal loads are then multiplied with EH/EC & -(1-{(SH/SE)*(EC/EH)}) to meet the requirements of Equation 18 & 19 of ASME B31.1. This is to calculate hot and cold reaction forces.

These hot and cold reactions are then added to dead weight and Maximum and minimum in each case is compared,ie {MAX OF (Dead load+Hot reaction) (Dead load+Cold reaction) (Dead load)} is given as maximum design anchor load in one direction (X,Y,Z,Mx,My,Mz). Similarly Minimum of all is calculated and is given as anchor design maximum load with opposite sign(-X,-Y,-Z,-Mx,-My,-Mz).

Now I want to know if CAESAR includes this hot and cold reaction while computing anchor forces and moments for operating load cases such as W+D1+T1+P1+H.

By default it calculate on EC base, but of course, if you change in the Load Cases Editor Ec with the Eh for the loading case you want, you will obtain the reaction loads you want.
Regards,

In my opinion, B31.1 is a bit light on its application of the rules you show below. I believe it is handled much better in B31.3. B31.3 shows your rules under paragraph 319.5.1 titled "Maximum Reactions for Simple Systems". Here it states: For a two-anchor piping system without intermediate restraints, the maximum instantaneous values of reaction
forces and moments may be estimated from [the equations you list].
Also, the rules you mention are only valid for linear systems or systems that respond in a linear fashion.
In CAESAR II I would simply build the load sets that the system would see and, with the appropriate E, check those reactions.