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Note: see additional comments about Time history analysis in AutoPIPE on the following WIKI's:
Water Hammer (Time History) Example - Modeling Approach in AutoPIPE
Dynamic Analysis - Time History load case in AutoPIPE
On the Load> Time History Location dialog screen, change value at node (ex. C14 N) from Dy = -1 to Dy = -10 and there is no change in the results, but if change Dy = 0, there is a change in the results. Why?
Answer: From the online help:
DX/DY/DZSpecify the direction cosines or offsets of the time history load (i.e., values of 1,0,0 would specify the X-direction as the direction at which the time history load is applied.
Specify the direction cosines or offsets of the time history load (i.e., values of 1,0,0 would specify the X-direction as the direction at which the time history load is applied.
Therefore, changing Dx =0, Dy = -1, Dz = 0, to Dx =0, Dy = -10, Dz = 0, has no affect on the direction cosines, the load is still going to be applied in the -ve Dy direction regardless if Dy in this case is any number -1 to -infinity.
In addition, by setting Dx =0, Dy = -1, Dz = 0, to Dx =0, Dy = 0, Dz = 0, will have a significant change on the results as there is now no directional cosine specified for the load.
If there was another direction with a value, Dx =1, Dy = -1, Dz = 0, to Dx =1, Dy = -10, Dz = 0, is a significant change in the directional cosine. Thus changing the results.
When running Time History analysis are they able to get restraint reactions?
Open the example time history model that comes with AutoPIPE:
Perform a complete time history analysis and check the "Support" tab on the Results grids for M1 load case:
Yes, a time history can produce support loads.
Reason for no loads on segment A, the forces generated by the transient are not restrained by any of the supports bearing directions.
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