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distribution of wheel loads on wood deck over steel stringer

distribution of wheel loads on wood deck over steel stringer

distribution of wheel loads on wood deck over steel stringer

(OP)
Hi,

I'm trying to rate a simple span wood deck over steel stringer bridge.  If I have 8x8 nominal decking with 2" wear on the wheel line.  Would you use S/4.5 (4" thick) or S/5.25 (6" or more thick)for wheel load distribution per AASHTO table 3.23.1?

thanks,
tim

RE: distribution of wheel loads on wood deck over steel stringer

I would use S/5.25 and reduce the section properties to account for the as-is condition.

RE: distribution of wheel loads on wood deck over steel stringer

(OP)
I used S/5.25 initially, and the review engineer suggested that I should use the actual deck thickness at the wheel line to determine the distribution.  Do you have any justification for using S/5.25, as S/4.5 will give me a more conservative number.  

thanks...

RE: distribution of wheel loads on wood deck over steel stringer

Perhaps I misread. If you have 8" original thickness and 2" inches of wear, you still have 6" and S/5.25 is OK. There's nothing wrong with being conservative. However, will being arbitrarily conservative create any unnecessary problems?

For example, will the lower rating from S/4.5 affect a certain type of vehicle that regularly uses the bridge?  

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