orsional design of box sections
 

torsional design of box sections
hi, can anyone give me any reference or materials regarding the design of concrete box sections (box girders) curved in plan? (i.e. subjected to torsional moment.)
thanks in advance--
rafat125
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the macgregor and wight text has a decent discussion of torsion. i'm failing to recall if it specifically discusses boxed sections, but the mechanics should be the same.
are they prestressed bridge girders?