Negative Moment Capacity for Flared Girders

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alohan
Negative Moment Capacity for Flared Girders

I have flared girders where the tributary deck width for each girder is varying along the length of the bridge. The same number of bars are going to be placed in each bay so the area of rebar that will be effective over each girder will be constant along the length of the bridge (minimum bar spacing at one end of the bridge and maximum bar spacing at the other end). In PGSuper, under Edit -> Bridge -> Deck Reinforcement, I only seem to be able to add rebar as in2/ft width of bridge so the amount of rebar in the deck varies along the length of the bridge as a function of the deck width. Is there a way to just set a constant area of rebar for a girder for the negative moment capacity calculation? Thanks!

Rick Brice
Negative Moment Capacity for Flared Girders

Unfortunately, there isn't a way to model flared deck rebar. I've put this down as a priority feature request. The entire deck modeling feature needs an update.

In the meantime, the best that you can do is have multiple models, each with different amounts of deck reinforcement. PGSuper determines the total area of deck reinforcement per girder as (tributary width)*(area of steel per foot). Each model will correspond to the reinforcement at specific sections of the girder. Since only one or two sections will likely govern the design, this approach shouldn't be too difficult.

alohan
Thanks for the response. I

Thanks for the response. I just used the demand moment from the model and calculated the capacity by hand as its pretty straight forward. I am new to the software so just wanted to make sure I was not mis-interpreting the input fields.

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