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  1. jtstruct

    USGS Ground Accelerations - what is the "max considered EQ"?

    Hope someone here can help me out on what I think is a very basic questions. The USGS maps in the IBC code refer to the "Maximum Considered Earthquake Ground Motion" for short period and long period response accelerations. Fundamentally, does anyone know what the probability of these ground...
  2. jtstruct

    Driving over a buried fuel tank

    Hi Gang, I have an unusual situation, and I hope this is the right forum for this thread. We have an existing buried fuel tank in a grassy area (supplying an adjacent above ground generator). Due to limited access in the landscaped area, a truck will have to drive over this tank to access a...
  3. jtstruct

    Carbonate vs. siliceous aggregate

    We are trying to determine fire ratings for an existing concrete elevated floor (pan joists at 2'-1" on center with a 2.5 inch slab). The code seperates the concrete categories into cabronate base and siliceous base. Is a core sample and testing the only way to dermine which type of...
  4. jtstruct

    Excavation in existing crawl space

    Thanks in advance for your time. I'm involved with a project where the designers plan to excavate in a crawl space to create a basement for a mechanical room. The designers have drawn a 45 degree line from the edge of the existing footings into the crawl space area. Their argument is that...
  5. jtstruct

    Short retaining wall cost

    We have a condition where we would like to put in approximately 30 feet (in length) of a 5 foot wide sidewalk. The slope in this condition is approximately 6 in 12, resulting in (approx) a 2.5 foot drop along the sidewalk width. I'm trying to determine the most economical way to retain this...
  6. jtstruct

    Electro-Osmotic Pulse Technology

    Hello Forum: I briefly mentioned this is a previous thread, but I'd like to pursue this topic futher. A local company has patented rights to this waterproofing techonology that they call Electro-Osmotic Pulse (EOP). The science is not new (water flows from positive to negative charge), but...
  7. jtstruct

    Small penetrations in existing concrete slabs

    Do any of you know of "rules of thumb" available for small penetrations of existing concrete floor slabs? I have a condition where they would like to drill a small conduit (3/4") through an elevated cast-in-place floor slab (old building), or possibly drill a 3/4" groove in...

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