Arch Bridge
Arch Bridge
(OP)
I am now learning to use STAAD to load rate arch bridges.
Does anyone have a tip on how to model the arch in STAAD? Is there a way to import from Microstation? Or is creating several grids with different dimensions the only way to do it?
Thanks.
Does anyone have a tip on how to model the arch in STAAD? Is there a way to import from Microstation? Or is creating several grids with different dimensions the only way to do it?
Thanks.





RE: Arch Bridge
Is the arch a slab or beam with vertical posts supporting deck (open spandrel)or beam with solid plate supporting deck (closed spandrel?
RE: Arch Bridge
Any other tips on how I should do it?
Thanks!
RE: Arch Bridge
RE: Arch Bridge
I see you have the arch members and a grid that doesn't look like members with several supports. Why did you do that?
Thanks!
RE: Arch Bridge
RE: Arch Bridge
Thanks for you help!
RE: Arch Bridge
RE: Arch Bridge
Can I apply the distributed wheel loads directly to the arch or do I have to model top of deck members?
Is there a way to define a moving truck load or do I have to add the loads manually at different points?
RE: Arch Bridge
Attached is some output from BRASS-CULVERT for 2 feet fill using LFD for HS20 Truck. This shows the axle loads, spacing, impact and distribution factor to multiply by the axle weights to get loads on 1 foot width of arch bridge. I put loads on arch member model as different loads until I got maximum moments on center member since the arch was not in same vertical elevation. Once you get maximum live load + impact, dead load, and moment capacity of center member you can rate arch for moment.
Ed
RE: Arch Bridge
Thanks!
RE: Arch Bridge
(Mu/1.3-Mdl)/Mll+impact. Mu= Moment Capacity, Mdl= Moment due to Dead Load, Mll+impact= Moment due to Truck + impact. After you calculate Rating Factor multiply this by the weight of particular truck. For example assume RF= 1.45, then capacity of bridge for HS20 truck would be 1.45 x 36 tons = 52.2 tons