live load distribution factors

4 posts / 0 new
Last post
live load distribution factors

Hi Rick,

I understood the “Girder Connectivity” setting is used for live load distribution factors. But it seems does not work for void slab girder. No matter what setting is picked, the live load distribution factors remain the same.

Based on BDM 3.9.3, for exterior girder design with slab cantilever length exceeding 40 percent
of the adjacent interior girder spacing, use the lever rule with the multiple presence factor of 1.0 for single lane to determine the live load distribution. Does PGSuper use m=1.2 or 1.0 under in this case? My hand calculation result ends 1/1.2 of PGSuper result.

My file is attached.

Thank you!

Yan Liu

Binary Data H10 Truck Span 1-3.pgs199.8 KB
Rick Brice
Sorry I haven't been able to

Sorry I haven't been able to get to the questions you sent to me on my direct email. I've had other higher priority tasks to tend to. WSDOT does not generally provide ongoing support services. You may consider purchasing the Professional version so that you can get support when you need it.

In short, your bridge has a type f cross section. The girder connectivity only applies only to type i and j sections.

I'll consider disabling that setting for type f sections as it has no effect.

That's all I've got time for at the moment.

I hope to have some time in the next couple of weeks to get to your other questions.


I see. Thanks, Rick. I also

I see. Thanks, Rick.

I also noticed that the dead load of the CIP deck on top of the void slab girder is not uniformly distributed to all girders. The dead load of the deck overhang is only added on exterior girder, not interior girder. Am I right?



Rick Brice
Yes, you are correct. Deck

Yes, you are correct.

Deck dead load is distributed to the girders based on tributary width as explained in the Technical Guide, Structural Analysis Models topic.

Log in or register to post comments