generation of impact factor of bridge standard loading

huangyhg

generation of impact factor of bridge standard loading
hi friends,
i am working on generating a standard bridge loading for our country. i have established standard design vehicles by analysing the traffic axel load data of our country. now i want to establish a relation for computing impact factor on bridges.
so, can anybody help me by suggesting me the method of calculating impact factor.....?
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have you tried the bridge engineering forum?
stephen a
the governing bridge code (aashto) here in the usa uses the following formula -
i = 50/(l+125) where l is equal to the span length under investigation.  i is limited to 0.3.
for regions of the span where there is continuity over the supports, the l is the average of the adjacent spans.
this has served us well over the years since the code's inception.
regards,
qshake
eng-tips forums:real solutions for real problems really quick.
just to be clear shakildor, qshake noted a percentage of ll, not a factor.  the factor would be limited to 1.3 ......  i would hate for your code to specifiy a .3 impact factor.