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For your information Lomarandil, I'm not at all confident in the contractor! Sad, but that's reality. So 5% it is!

Thanks all!

Thanks Sliderule era (me too I used the slide rule!), The contract has been awarded, the bridge is being built, but the bearings have to be changed before concreting the barriers and sidewalks etc, BECAUSE THE DESIGN ENGINEER DIDN'T DESIGN THE BEARINGS PROPERLY IN THE FIRST PLACE!. This is...

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...

er... who's gonna point out their typos? I'm just a Canadian!!!!

Thanks Bridgebuster!

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 -...

Yes, you're absolutely right. Thank y'all.

not yet.

We're in Montreal, Canada - usually we leave that up to the contractor. I'm the designer.

Welcome to the wonderful world of skew decks.

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’...

It's becoming clear to me that no method exists to give the in-situ member stresses; I'll have to ask the erector for his precise sequence of installation, and add up the stresses for each member manually in a spreadsheet, and that this at best will be an approximation of the actual stresses...

Yes, the girder was jacked AFTER the x-bracing was in place.

Here's a bit of background: the steel for 2 skewed slab on girder bridges has been erected, and the steel is presently bare while we investigate why the girders have all been installed crooked. The fitting was forced together, and one of the main girders was jacked longitudinally to correct...

Thanks Ron!

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...

Again, thank you all for your wonderful comments. Attached is a good article on the subject of beam lifting. The statement “The girders have layovers all over the place" means that, say for five girders, each has different top and bottom flange lateral offsets at the supports, one beam's top...

Thanks guys. At least you guys have something down there. In Canada, we don't have much guidance. Our S6 code is basically copied off AASHTO!

Here is a picture of the girder. Notice the splice smack in the middle between the lift points - with the flange forces reversed!http://files.engineering.com/getfile.aspx?folder=2afb4573-6f3d-4c7a-83b4-a0acf00c30da&file=182-foot_girder.jpg