Applies To
Product(s):	AutoPIPE
Version(s):	ALL;
Area:	Results
Original Author:	Bentley Technical Support Group
Date Logged & Current Version	April. 2017 11.00.00.22

Problem:

Support forces for Occasional load (i.e. Earthquake) is not evenly distributed among supports in AutoPIPE model, why?

Example:

For the give model subjected to a static earthquake load:

Support results are:

Why are they not all even?

Solution:

AutoPIPE calculates the force on the supports dues to Static Earthquake load as Mass x Acceleration. Because the pipe has Line stop supports at different intervals and pipe size are changing along the pipeline length (12"to 14" to 20" to 36" dia) directly affects the mass / force applied to a particular support.

If the modeled pipeline was created with one pipe size and all the supports are evenly spaced so the same mass was applied to all the supports, than, Yes, the support loads would all be the same, see Seg A below:

09. Support forces for Occasional load (i.e. Earthquake) are not evenly distributed among multiple s

Problem:

Solution:

See Also