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Difference between load combination I and IA of AREMA RAILWAY MANUAL

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Okeore

Civil/Environmental
Jul 20, 2019
5
I've never used this manual before, and now I'm using it to do a study to my university (I'm not from USA).

I can't find any response to my question in the AREMA manual, or in other books.

What's the difference between load combination I and IA of AREMA RAILWAY MANUAL for Concrete Structures? When should I use each of them? My case it's the design of a railway bridge with I-girders of prestressed concrete just with DL and LL.

 
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