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  1. nwong

    Historic Brick Load Bearing Walls with Rotted Out Wood Strip

    Encountered a 2" thick strip of wood within a 2-wythe bonded brick wall (party wall) right above basement floor level(3 Story Above). Basically, the brick wall was constructed to a certain height, a 2" wood board was placed down and then the construction of brick continued on top of this wood...
  2. nwong

    Guard Rail Strong or Weak Posts

    Greetings Guardrails are often labeled as Strong or Weak post but I can't find a definitive definition of each. I have heard it deals with the deflection of the post at impact but can't find the criteria or the standard that caterogizes the system as strong or weak. Your help would be greatly...
  3. nwong

    Impact Loads on Retaining Walls

    I've come accross many situations where I have a vehicle guard rail attached or directly adjacent to the top of the a (concrete/masonry/steel) retaining wall. Most of the time they're along drives and parking lots within a site. AASHTO Section 2 says to use a 10kip load over 5ft for concrete...

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