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Rank: Advanced Member
Groups: Member
Joined: 12/13/2005
Posts: 1,321
Location: Latrobe,Pa.
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Friday 2 weeks ago,a workman was using a torch that let sparks ignite tarps that caught plastic pipe,I heard used for wiring maybe electrical conduit on fire.The fire was severe enough to warp a compression beam.J. B. FAY is the prime. They were supposed to have bridge reopened this past Monday. Closed indrfinitely.They need to jack bridge to install new beam. We are wondering exactly what is or has happened. www.liberty bridge. com.They are saying if fireman hadn't put out fire as quickly,bridge would have collapsed.Any you guys have knowledge have what could have happened?
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Rank: Advanced Member
Groups: Member
Joined: 10/7/2004
Posts: 1,603
Location: Gypsy
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We drove by it coming back from lunch. My coworker video taped it as we drove across the 10th street bridge. The video then got picked up by the news and was all over the place.
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Rank: Advanced Member
Groups: Member
Joined: 10/7/2004
Posts: 1,603
Location: Gypsy
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I don't though know what exactly your question is. The tarps and stuff caught on fire and the heat warped the thin steel.
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Rank: Advanced Member
Groups: Member
Joined: 12/13/2005
Posts: 1,321
Location: Latrobe,Pa.
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I'm not an engineer. I would think once one beam is deformed then some where else something,beam,etc,will move.It doesn't seem to be an easy fix.Sure there is movement at beam where fire was most intense,shows bent on one pic.However I would think in a truss everything,beams rely on each other to transmit load to ground supports.That was my idea for my question.
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Rank: Advanced Member
Groups: Member
Joined: 2/14/2014
Posts: 151
Location: Dallas
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The way trusses work if one member failed the rest of the structure is at risk. More recent trusses have redundant members to prevent failure
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