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  1. IslandEngineer

    Horizontal Forces on Cantilever Piles from Floating Structures

    thread218-297339 I need to design (size and embedment) several cantilever pilings (probably open 12" - 14" diam steel pipe)to replace existing timber pilings that support a series of 5' x 20' floating docks ... the design site (Puget Sound) is a slightly sloping (1 : 12) sandy beach (with...
  2. IslandEngineer

    Use of seismic overstrength factor in light-frame construction

    JAE I sincerely appreciate your comment "if you are thinking that the OS factor is either applied to the structure or not to the structure as a whole, you are mistaken." Frankly I was applying the factor to the entire structure. This I did following my interpretation of the 2010 structural...
  3. IslandEngineer

    Use of seismic overstrength factor in light-frame construction

    JAE, Thanks for the input. What I think I am understanding is that the overstrength factor does not need to be applied if the materials and connections, making up the seismic force resisting system, develop a redundant and ductile system. Noting the many nails, screws, bolts, laminated...
  4. IslandEngineer

    Use of seismic overstrength factor in light-frame construction

    Basically, when is the overstrength factor required to be applied in light-frame wood design? Previous thread176-244422 asked this question, JAE replied and referred to previous Eng-Tips discussion; consequently, I searched the site for the previous posts but came up empty. I attended a...
  5. IslandEngineer

    lateral load design for log houses

    Mike, You ask..."being green logs with no apparent method for allowing for normal vertical settlement due to cross grain shrinkage of the logs: 1) Are the logs checked horizontally? 2) Has the chinking been replaced over the years, or in need of now?"...and you note..."the rebar are...
  6. IslandEngineer

    lateral load design for log houses

    Msquared48 & RockEngineer, Thanks very much for your response. Mike asked "Are the driven rods in oversized holes for the first log or two, with the lowest log driven into?" Answer is...per the builder, the holes where not oversized, the wood was "green" & the holes were drilled slightly...
  7. IslandEngineer

    lateral load design for log houses

    Engineers, I need to develop the structural requirements for the repair of a 1982 (2) story log house damaged by fire. The house is not a "kit" type log house; it was hand built. The 2nd story is a total loss and will be removed and subsequently rebuilt using standard 2x6 light frame...
  8. IslandEngineer

    Wind Loading on Open Arch Structure

    JAE, in ASCE 7-05, Figure 6-1 (pg 33) reflects 85 mph 3 sec gust wind speed; that 85 mph wind speed is converted to pressures in Fig 6-2 (pg 38) and our local building juridictions have adopted the 85 mph basic. We are using the 2006 IBC; the 2009 IBC does not become active for our jurisdictions...
  9. IslandEngineer

    Wind Loading on Open Arch Structure

    Thanks Jed for the write-up on the Dallas Cowboy Practice Facility collapse. And Thanks AggieYank for the thoughts and advice. I plan to use ASCE 7-05 as the basis for the foundation design, specifically, Figure 6-8. As AggieYank noted, the manufacturer of these arch buildings should be...
  10. IslandEngineer

    Wind Loading on Open Arch Structure

    Thanks AggieYank for your concern. The arch structure is purchased by others and the manufacturer does not provide reaction loads. My job is to provide a support & foundation for the structure. My request is to find a method of calculating the wind lateral loading (about each axis) and uplift...
  11. IslandEngineer

    Wind Loading on Open Arch Structure

    Q - Where are you? What codes apply? A - Whidbey Island N of Seattle in Washington State. Code is 2006 IBC. Q "...is the fabric attached to your frame, or does the frame just hold it up?" A - Arch frames just hold the fabric up. Fabric is pulled over frames after frames erected. Arch...
  12. IslandEngineer

    Wind Loading on Open Arch Structure

    I have two 42 ft wide x 18 ft high x 40 ft long arch structures similar to a WWII "qunset hut" building. Both are supported along the sides only (not the ends) on walls 9 ft high. The structures consist of a series of light weight steel arches on 4 ft centers with a fabric cover. Both ends are...
  13. IslandEngineer

    2003 IBC - Residential Interior Wall Loads

    I have a residential, non-load bearing, 14 ft high, interior wall constructed of 2x4 studs at 16" c/c with drywall each side. The wall is not intended to carry gravity loads nor lateral loads. Is there any design criteria for this wall? I think I remember a 5 psf lateral load requirement for...
  14. IslandEngineer

    Combined loads when calculating earthquake lateral loads

    Section 1605.3 of the 2003 IBC defines load combinations for allowable stress design, one of which is equa 16-9 which requires combination of D (deadload) + 0.7E (earthquake) + L (liveload) + (Lr or S (snow) or R (rain))...section 1605.3.1.1 allows the combined loads to be multiplied by a 0.75...

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