I have to replace the bearings for a one - 260' span , 50' wide , slab on 5 x steel I girder (10' high) bridge. The girders will be lifted simultaneously at the diaphragms at each abutment.
Question: What do I tell the contractor to do to block the bridge laterally (and longitudinally?) during...
There seems to be a typo in the charts on page 5-19 of the LRFD Seismic Bridge Design 2nd edition 2011 (see page 3 of attached doc);
The Ast/Ag curves can only represent percentage of resteel, so there's a 0 missing, and instead of 0.1 , 0.2 , etc it should read 0.01 , 0.02 , etc -...
I have to pour the deck slab of a skew bridge soon. After reading a bit of the literature out there on the subject, I’m getting a little nervous about the proper sequence of concrete pour to follow (i.e. perpendicular, parallel to skew, or staggered perpendicular pour).
I have a 260’...
I have to measure the existing stresses (tension or compression) of bridge cross-bracing members on an existing bridge under dead load, preferably in a non-destructive manner. There is a bewildering range of methods and equipment out there to accomplish this. What would be the easiest, cheapest...
For a girder lifted by crane at 0.4L and 0.6L points, giving 0.4L cantilever overhangs, what unsupported lateral length should I use? A lot of people say 3 x the overhang length; is this correct? The girder is loaded only under its own self-weight.
For the same girder, is the moment magnifier...
I checked the stresses for the lifting of a steel girder (see attached) and FCR was overpassed by double; according to AASHTO LRFD I was allowed 20 MPa and the actual girder flange stresses are 43 MPa. The L/b of the girder is 79, which is marginal. The girder was put in place and the bridge was...
