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  1. asabender

    Jack slab floor possible failure

    While at a converted mill, the owner had me take a look at two unrelated areas both of which made me sweat and curse. One is a jack arch slab supporting an inhabited floor. The arches span between beams at 36" on center (presumed steel "S" beams) and are reinforced in the transverse direction...
  2. asabender

    Load check existing steel columns

    I'm in a situation where I have been asked to verify that it is okay to remove an existing HSS6x6 from an existing building. I want a way to verify loading on it directly in the field, having run out of easy options for analysis, and am looking for suggestions. Some background: The column...
  3. asabender

    Pinning to ledge / Doweling to bedrock

    The engineers I trained under, and everyone in the area of New England we work in, pin foundations to ledge if in direct bearing... meaning #5 redar embedded 6" or so into crystalline bedrock at maybe 48" on center. I have done so for years, but was recently questioned about it, and realized...
  4. asabender

    density of riverine flood water

    I am trying to design a hydrostatic retention system for a riverine flood. I know the elevations and flow volumes during the design flood event, taken at the location, which is a real event from 2010 exceeding the FEMA 100 year flood. The project area is in a still water zone. I am trying to...
  5. asabender

    Floating Breakwater

    Reference to previous thread: thread321-241023 My firm has been asked to provide a quote to design a floating breakwater for a marina on the Atlantic coast. Does anyone have any resources they have found particularly helpful in such design? What I would really want would be a ASCE or US ACE...
  6. asabender

    Partial Tensile Lap

    A building has been constructed with less than the full required development length of exposed (set) dowel between a foundation wall and a structural slab. My past experience has been that the required tensile lap can be determined per ACI 12.2 and then the fraction of the normal design...
  7. asabender

    seawalls and required design storm

    I'm a civil engineer working on a project in Massachusetts. Do seawalls need to be designed to meet the loading/overtopping/scouring conditions of a 100 year storm? Most certainly have not been (by inspection), and I have never before been asked to check the recurrence at which a wall will be...
  8. asabender

    Roof Paver Uplift & Parapet Walls

    I have been trying to check an uplift scenario for a finish-work installing client. In this case, they are trying to put terrace patio pavers on a high rooftop in a hurricane prone region. The IBC specifically says that aggregate is not allowed on roofs, and that ballasted roofs are not...

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