Can anyone suggest a reference which will provide clear guidance on circumstances in which one may use the Operating Rating Level?
The AASHTO Manual is not quite clear. It seems to be saying that the O.R.L. should be used for an extreme circumstance. Can construction loads from heavy rigging...
For a highway bridge pier supporting simple spans on either side, should the pier be designed for one HS20 truck per lane (positioned right above the pier for maximum total reaction), or for the sum of the maximum reactions from the spans on two sides?
The latter implies two trucks being...
