Dear All ,

I still consider a newbie in pipe stress analysis, i faced some problem in my stress analysis this morning .

1. it is a displacement problem .What i wish to know is does the displacement affect the calculated stress result . currently what i am working is a ballast system , exactly a straight long pipe in the ship. The loadcase what i concern in the stress analysis is as below
L1 W+T1+P1 (OPE)
L2 W+T1+P1+D1 (OPE)
L3 W+T1+P1-D1 (OPE)

The reason i include the displacement is i am considering the sagging and hogging effect in the ship eventually the pipe will delfect up and down. What my concern is the result for this 3 case have similar in term of calculated stress result , even the loading also similar after i generated the output. I wish to the what main reason cause this things happen , suppose it should be different in the result .

So , I wonder i am making some mistake during input or it is really have same some result.

Regard Glenn