Hello all, i'm looking for other opinions/clarification on a rebuild of our covered bridge ( I-beam ) selection.
calculations for the new beams based off a friend of a friend .
Our bridge is a timber frame style bridge, it's In and exit height is 8ft with bumper hangers set at 7' 6 inches ( cars and light truck only )
although the bridge has gone though many faces, the steal box beams were never replaced and as of now are completely rusted through.
the bridge is closed to traffic atm. ( originally build back in 1976 ).
measurements:
bridge length - 20ft
bridge width - 16ft
plank style rough timber - sub floor 4" h x 8"w x 16ft L planks.
this bridge does span a waterway and we are in the process of pulling a GP-11 permit through DEP.
we are simply removing timber frame and old beams ( 4 old rusted box beams ).
new beams calculated for our bridge are 4 beams @ 12 x 26 WF beams at 20ft length.
the open clearance for the bridge is 19ft.
so my question is, are these beams adequate or should i get different size?
as a side note we are not changing the concrete walls on each end . setting new beams in the 4 old pockets . ( hence us using 4 beams )
we are basically replacing old with new and building it the same as is now.
listing of original bridge - 38-07-A
current bridge that was hit by pick-up truck with trailer.