## AASHTO Braking Loads in Standard Specs

## AASHTO Braking Loads in Standard Specs

(OP)

I am doing some analysis of a bridge that was designed in 1961 and am trying to understand the braking loads that were used for design at that time. I have the 17th edition of the standard specs and it states to use 5% of the live load for the longitudinal force. I dug up the 5th edition from 1949 and it states the same thing, so it doesn't appear that this load changed much in 50 years.

Does anyone have access to the 7th edition, which was published in 1957? My hunch is that it is exactly the same.

Thanks

Does anyone have access to the 7th edition, which was published in 1957? My hunch is that it is exactly the same.

Thanks

## RE: AASHTO Braking Loads in Standard Specs

BTW - did you find the 49 version on line? I used to have the 44 and 49 but they grew legs.

## RE: AASHTO Braking Loads in Standard Specs

## RE: AASHTO Braking Loads in Standard Specs

## RE: AASHTO Braking Loads in Standard Specs

## RE: AASHTO Braking Loads in Standard Specs

## RE: AASHTO Braking Loads in Standard Specs

Some use that distance, 4' then, 6' now, as a moment arm for the braking load, and apply a moment to the top of the pier.

## RE: AASHTO Braking Loads in Standard Specs

## RE: AASHTO Braking Loads in Standard Specs

Yeah, I suppose that would be the proper way for a pier that's integral with the superstructure, and since it would be added to the vertical live load, it could be part of a controlling load case.

## RE: AASHTO Braking Loads in Standard Specs