C.09. Why when modeling a little more weight does the results increase exponentially to become severally over-stressed in AutoPIPE's code compliance report?

Applies To
Product(s):	AutoPIPE
Version(s):	ALL;
Environment:	N/A
Area:
Original Author:	Bentley Technical Support Group
Date Logged & Current Version	Aug. 2016 10.01.00.09

Problem:

Why when modeling a little more weight does the results increase exponentially to become severally over-stressed in AutoPIPE's code compliance report?

Example:

Distributed load = 21000 N/m, A12 results ratio = 0.10

However when only the Distributed load is increased to 22000 N/m, A12 ratio = 4.30.

How can modeling such a small amount of weight make such a significant difference in the results?

Solution:

Best to review the results Displacement sub-report in both cases:

Distributed load = 21000 N/m

Distributed load = 22000 N/m

clearly the Soil properties are in adequate to support the heaver distributed load.

Workaround:

Review the soil properties to be sure that they have been entered correcty based on soil test. This analysis example requires a stiffer soil property to support the heaver pipe.

Adjust the soil properties as needed or reduce the vertical reaction force on the pipe.

C.09. Why when modeling a little more weight does the results increase exponentially to become severally over-stressed in AutoPIPE's code compliance report?

Problem:

Example:

Solution:

Workaround:

See Also