It seems that the distribution for dead load from bridge parapets is constantly changing in the AASHTO Specs. The latest edition (9th/2020) states "heavier concentrated line loads such as parapets, sidewalks, barriers or sound walls should not be distributed equally to the girders. Engineering judgement must be used in determining the distribution of these loads." This doesn't seem to give much guidance but I am currently designing a 120' span bridge with a 30 degree skew so I'm looking into how to distribute the parapet load among the exterior/interior girders. Does anyone have any suggestions on how to distribute these loads?
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