User Defined Load During Lifting and Hauling

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ricamartinez
User Defined Load During Lifting and Hauling

I am having trouble getting my girder lifting check to pass (failure in compression at the bottom flange). Changing my strand configuration to fix this issue only causes the open to traffic check to fail, which at the time is my biggest priority. I am trying to model a temporary user defined load during event 1 in order to come up with a solution for the lifting fail. PGSuper only lets me model user defined loads at events 4,5 and 7. Does anyone know of a way to model user defined loads during other events? The manual states that user defined loads can be placed at any point in the timeline.

Rick Brice
User Defined Load During Lifting and Hauling

I'm not sure what a user defined load at time of initial lifting will do for you. Would you have the fabricator add external weight to the beam before lifting it from the bed?

Typically, if the compression check isn't working, the concrete strength needs to be increased.

You can simulate a load at lifting by adjusting the impact factor. The impact factor is a multiplier on the self-weight of the beam.

We will get the documentation updated so it is accurate.

ricamartinez
Yes, an alternative plan is

Yes, an alternative plan is to have the contractor/fabricator include a temporary load during lifting. The criteria we are using limits us from increasing our concrete strength and we currently have alternate solutions to our problem, but if we can stick with the original configuration that would be awesome.

Rick Brice
For PGSuper, your best option

For PGSuper, your best option is to either apply an impact factor or change the reinforced unit weight of concrete.

You can export your beam from PGSuper to a PGStable file. PGStable is just the stability analysis alone and you can more easily tweak parameters that are otherwise locked away in Project Criteria in PGSuper.

This seems like a very unique situation. I'd love to learn more about it. Please consider writing an article for PCI ASPIRE magazine that discusses the problems and solutions.

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