huangyhg

bars
does anyone know of, or have, some material that takes you trhough a step by step input of structure information, to determine a bars rating. i have the program, and manual, but there are no pratical instructions on using the program.
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bridge analysis and rating?
my 2 cents,
if so, i've experience working on a mainframe verision of that program and would mention that it is not for the weak of heart or those unfamiliar with bridges and bridge rating.
most state dot have simpler rating calcs that they make available to their consultants. i think this is also available from the fhwa. most of the time, consultants don't do enough ratings to justify the cost of those elaborate programs.
hey q...popular subject here lately, huh?
bars, i believe, is the rating program developed by michael baker corporation in pittsburgh. i believe they also support the program through an agreement with aashto or perhaps the fhwa (not sure which). assuming you are not using a pirated copy (), you can probably get a manual from them.
the input parameters are likely similar to virtis or braas/brass?? . virtis is the aashto software and braas/brass?? is one that washington state uses. most of these are respondent to the nbi or aashto requirements.
ron
hey ron...it sure is. i'm still out on that one question about the pre-stressed girder. of course, i assumed it was steel. seems everything here in the midwest was steel until the late 1950's when some agency started experimenting with that "new" material/element: prestressed concrete. they started out as short, simple span deck beams and now look where they are! i see the same trend in composite material nowadays. perhaps we'd better buy some stock ()!
anyway, back to the prestressed girder. i don't know how you confirm the strand pattern. even if you know the date and manufacturer it is a very iffy situation to affix your seal to a rating that is based on big ifs. and you could use some means of non-destructive imaging to located the strands thereby getting the number but what about the size and strength? i suppose at that time you must rely on the industry standards prevalent at the time and certainly err on the side of conservatism.
oh well, back to the drawing board. good to see you in the neighborhood!

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