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  1. ndalle03

    Site Blasting For Large Facility Causing Residential Foundation Issues??

    MTNCLimber - I was thinking the same thing! I'm a structural engineer so I look for cracks and such. A typical homeowner doesn't pay attention until it's significant; (or until they hear their neighbor noticed cracks following the blasts so they start looking themselves). However, the few...
  2. ndalle03

    Site Blasting For Large Facility Causing Residential Foundation Issues??

    For several months now, blasting as been occurring twice a day for site work for a million + square foot facility. Recently, nearby (approximatley 1 mile or more) homeowners have noted foundation issues. It is starting to become a news story and homeowners are adamant that the foundation cracks...
  3. ndalle03

    Blasting for Large Commercial Structural Causing Residential Foundation Issues??

    For several months now, blasting as been occurring twice a day for site work for a million + square foot facility. Recently, nearby (approximatley 1 mile or more) homeowners have noted foundation issues. It is starting to become a news story and homeowners are adamant that the foundation cracks...
  4. ndalle03

    Allowable Deflection for DL only (RESIDENTIAL)

    Josh - Thanks for the input. I agree with your response. In this particular instance, I'm assessing a sagging floor of a 100+ year old building. Unfortunately, the floor joists are not exposed so I'll have to make assumptions on beam depth, spacing, and whether some DIY plumber notched the...
  5. ndalle03

    Allowable Deflection for DL only (RESIDENTIAL)

    I'm aware that allowable LL deflection limits vary based on use, but in this instance, lets assume that L/360 is acceptable for a residential application. If say, 10ft spans, the allowable LL deflection is 0.33inches. If the floor is sagging under dead load only, at say 0.25inches, or even...
  6. ndalle03

    "Shallow" Concrete Pier design with Lateral Loading

    Mike, Thanks for the response. The 0.2 ksf/ft is a "Lateral Bearing Pressure" from IBC 2012 Table 1806.2. It's just a conservative value based off the soil type, so essentially it is the same as passive pressure. I wasn't sure whether a 4-7ft, 18in dia. concrete pier would be considered...
  7. ndalle03

    "Shallow" Concrete Pier design with Lateral Loading

    I am designing an 18" diameter concrete pier (augured)to support solar modules. Lateral loads are in the range of 1.5-2kips. Typically the concrete piers are embedded 4-7ft; is this considered a long pier or short pier? I am struggling with how to determine the lateral resistance of the soil...
  8. ndalle03

    Interpreting Geotech Report for Allpile Input - Modulus of Subgrade Reaction (kcf)

    I am determining the embedment for W6x9 piles to resist lateral loads in the range of 1.25-1.5kips to support a solar structure. We typically do our own soil testing on site, however this project is unique. The geotechnical report provides a "Modulus of Subgrade Reaction (kcf)" in the range of...

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