bridge type selection
bridge type selection
(OP)
I'm sure this has probably been discussed before, but I can't find it. What are the pros and cons of AASHTO pre-cast girder bridge vs box beam bridge vs superbox culvert "bridge"
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RE: bridge type selection
AASHTO pre-cast girders are
easier to design
shorter span lengths
taller supperstucture / higher overall bridge profile
faster to construct
cheaper
boxed beam bridge
harder to design
longer span lengths
narrower superstructure / lower bridge profile
takes longer to fabricate
more expensive
superbox culvert
less hydraulic capacity than a true bridge
lowest overall profile
more impact on riverbed
RE: bridge type selection
+ allow easier deck forming system ~ PCP's or PMD's
allow less work on-site than forming Bridge class box culvert
- more $ goes to supplier instead of the contractor and local economy
box beam bridge
+ faster construction on-site
- more $
- normal lengths are 100 LF and less
Bridge class culvert
+ more $ to be made (or lost) by the contractor on-site and the local economy
(takes the supplier out of the equation)
- takes considerably longer to construct (in most cases)
- seasonal and more weather dependant
RE: bridge type selection
RE: bridge type selection
Off the top of my head with no verification.
The type 6's we have seen... utilized inverted-T (interior) caps...so the cap(s) are more $.
The 6's obviously cost more. (than 4's)
Eliminating a span (8?) of beams, as well as a bent of foundations, columns, and cap.
A little more labor utilizing the 6's.
They are significantly more unstable.
Bracing will be a little more.
Assuming the design for the foundations, columns, and caps would change a little...appears that it would be cheaper to go with the Type VI Design.
So ...... how much cheaper?
RE: bridge type selection
would be eliminating 1 set of drilled shafts, pier caps, piers and approximately 18 girders.
Circular/multi-column piers with dropped-type pier caps or hammerhead piers are recommended at the pier locations. Inverted tee pier caps can be used; however this type of pier cap was not recommended due to increased cost. drilled shafts are the recommended foundation type.
RE: bridge type selection
RE: bridge type selection
RE: bridge type selection
RE: bridge type selection
Any help will be appreciated.