Braking force distribution on bridge deck
Braking force distribution on bridge deck
(OP)
What would be the most accurate way to distribute braking force longitudinally on a concrete bridge deck. I have a conventional bridge, with one segment over several spans, ending with a fixed bearing at the abutment. AASHTO is giving a way to distribute the braking force only transversely, but not longitudinally. Is it OK to assume that the whole braking force will be taken by the anchor bolts on the fixed bearings at the abutment and none by the expansion bearings. Also, in case of a fixed bearings at both ends of a span, what would be appropriate to use- half of the braking force for each fixed bearing?






RE: Braking force distribution on bridge deck
I assume that the forces from braking with integral abutments must be taken as resulting from the analysis of the bridge ..., what may involve a range of behaviors just in case, even when you are quite sure of what to expect.
RE: Braking force distribution on bridge deck
RE: Braking force distribution on bridge deck
This was what I was thinking to use- distribute the braking force according to the stiffness of the bents. And yes, in the case of a span with both fixed ends there was a problem with temperature, creep and shrinkage. This was the reason I wanted to make sure I'm being accurate in accounting for the braking force and everything else along the C.R.L.
RE: Braking force distribution on bridge deck
I have a same question about braking force distribution but in my case, its a 2 span bridge with Expansion Joints at the abutments and all the bearings are elastomeric. Currently i have distributed the moment caused due to the longitudinal braking force equally to the abutment and the pier, but in actuality, the abutment with pile connection stiffness would be greater than the pier column connection(but due to presence of elastomeric bearings used on abutments and pier shouldn't the forces be equally distributed), SO i am thinking the percentage of moment distributed would be respective of its element stiffness. I am not sure if i should use equally distributed forces or determine the stiffness and then distribute the forces?
Sorry for posting in an existing thread, seemed relevant :)