Lateral bracing of bridge girders
Lateral bracing of bridge girders
(OP)
Can anybody give me guidence (or suggest any book) for design of lateral (wind) bracing of bridge girders.How we can incorporate/add wind load in to the load calculations during construction i.e before placement of concrete deck?





RE: Lateral bracing of bridge girders
RE: Lateral bracing of bridge girders
If this is LRFD you have to perform the calculation for bracing the compression flange during construction. If you're using the Standard Specs no check for construction conditions is required. However, there are methods you could use. For instance, check the girder about the weak axis assuming the diaphragms act as a support.
The old old US Steel bridge design manuals had an example.
RE: Lateral bracing of bridge girders
I multiplied the 50 psf x half the girder height to get a plf load on each flange. Then I analyzed the flange as a simply supported beam and checked the stress. I believe I divided the load by the number of gitrders in the transverse section since all girders would participate, although that may not be the case since there may only be 2 girders up when the big wind storm comes along.
Anyway, this is a method for determining a good minimum width for a flange to avoid problems during construction. Good Luck. Oh, I'd ask your boss. He has a better understanding of what your client wants.
RE: Lateral bracing of bridge girders
Regards,
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