huangyhg

airplane bridge design guides
are there design guides available for the design of bridges to carry airplanes rather than vehicles? in particular i am looking for slab and girder wheel load distribution factors similar to those found in the aashto manuals for vehicular bridge design.
thanks for your help.
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cool project! well, check around this site, i'm pretty sure there's some aipfiled design guidance.
try the faa - engineering division:
wow, that must blow aashto loads right out of the water. must keep spans small, huh?
aci 343r-95 might have what you need. also,i recall seeing in a multi-volume collection of aci publications a section on aircraft loads. unfortunately, i'm away from my office for a while and unable to look for it in the office library.
if you are dealing with boeing aircraft, very useful information can be found at:
in the past we've dealt with this using the information from the manufacturers and the faa specs on planes in conjunction with load distribution data from the fhwa for bridges. once you have the background for the load distribution is doesn't matter what the magnitude of the load is, so highway or airfield bridges, the load distribution principles are the same.
qshake:
according to my aashto manual the wheel load distribution factors for concrete on steel i-beam stringers and prestressed concrete girders is based on "design of i-beam bridges", by n.m. newmark, 1948. i have not read the article, but i would be concerned that the d.f.'s would apply to the large airplane wheel loads.
any thoughts?
tjclose,
as per "bridgebuster"'s suggestion, aci343r-95 may be of assistance, particularly section 5.10 "airport runway bridge loads". table 5.10 has aircraft loads and wheel spacing info. section 5.10.2 has info on relevent impact %.
section 5.10.3.2 has a bit of info on load distribution.
i like the text "bridge deck behaviour" by hambly that deals exclusively with deck modeling and load distribution.
hth
tjclose,
i didn't say we used aashto or the factors prescribed therein, i explained that with data from either manufacturers or the specs from faa regarding the tire footprint and load distribution (how much the front wheel loaded and the back) and using the distribution studies done by the fhwa (the fhwa has funded many studies to ascertain the behavior of various bridge decks under live load) to support the work of newmark you can then apply this to distribution of aircraft wheel loading.
lastly, newmark used surface influence lines to establish the distribution factors noted in aashto - you should read his work.
there was a recent article in the asce journal of bridge engineering nov./dec. 2001 vol. 6 no. 6 titled design consideration for aircraft bridges by bruce a. moulds.

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