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Recent content by AlanLord

  1. AlanLord

    Lateral & longitudinal blocking loads during bridge bearing replacement

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

    Lateral & longitudinal blocking loads during bridge bearing replacement

    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...
  3. AlanLord

    Lateral & longitudinal blocking loads during bridge bearing replacement

    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...
  4. AlanLord

    LRFD Seismic Bridge Design 2nd edition (2011) - TYPO?

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

    LRFD Seismic Bridge Design 2nd edition (2011) - TYPO?

    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 -...
  6. AlanLord

    Pouring of the deck slab of a skew bridge

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

    Pouring of the deck slab of a skew bridge

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

    Pouring of the deck slab of a skew bridge

    Welcome to the wonderful world of skew decks.
  9. AlanLord

    Pouring of the deck slab of a skew bridge

    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’...
  10. AlanLord

    Measuring bridge member stresses in-situ

    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...
  11. AlanLord

    Measuring bridge member stresses in-situ

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

    Measuring bridge member stresses in-situ

    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...

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