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  1. pegarrett

    Semi Hauling Excavator Hits Bridge over I-10 in New Mexico

    https://www.yahoo.com/news/10-west-near-lordsburg-closed-183814891.html 100% loss of prestressing strands in 3 of the beams. 40 strands per beam. Apparently the semi was going 75mph at the time of impact.
  2. pegarrett

    Highway overpass collapses in South Korea

    Looks like they were setting the prestressed concrete beams when 3 spans collapsed. Few details right now. https://www.cnn.com/2025/02/25/asia/south-korea-highway-collapse-hnk-intl/index.html
  3. pegarrett

    https://www.miamiherald.com/news/lo Four years after fatal collapse, Florida unveils design for

    The article states that they are using steel girders. From the scale of the people in the rendering it looks like the girders are just about the correct span to depth ratio. They could also be doing a thru girder on either side and have the deck supported by floor beams. Like a railroad bridge...
  4. pegarrett

    https://www.miamiherald.com/news/lo Four years after fatal collapse, Florida unveils design for

    Concrete is awful in bending. So in order for those towers not to snap in half there should be stays on the backside of the towers to turn the bending load into axial load. Philip E. Garrett, P.E. Structural Engineer
  5. pegarrett

    https://www.miamiherald.com/news/lo Four years after fatal collapse, Florida unveils design for

    I will never understand why owners are so in love with fake cable stays. It's the bridge equivalent of putting a fake ram scoop on a car hood. Philip E. Garrett, P.E. Structural Engineer
  6. pegarrett

    Uniform Surcharge Retaining Wall Load

    Steve73MGB, As RFreund stated above, but did not pursue, delta from the AASHTO equation and beta from the EM equation are equal to one another. An error is being made during the calculation of the value of delta. The correct value, given your inputs and AASHTO section 3.11.6.2, is...

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