[Loch-Ruadh] Gulf War Gate
tdsikes at prodigy.net
Sun Feb 10 08:42:01 PST 2008
Is there any info on using exterior grade stryofoam or
maybe instead of using plywood or backerboard on the
entire upper structure, only using it where needed and
leaving the rest as designed? Is there anywhere on
the upper structure that it would help to use plywood
or backerboard that the upper structure wouldn't have
to be modified?
--- Kazimierz Z³owieszczy <kazoflr at gmail.com> wrote:
> At February's Shire Populace meeting, alternatives
> to the Gulf War Gate
> completion were suggested. Before any work not in
> the approved plans takes
> place on the Gate, I want everyone to please
> understand the way that the
> Gate was designed and approved, and what changes
> would need to be made to
> safely modify the design.
> Design Consideration 1: Wind
> The upper portion of the Gate structure was designed
> for light covering
> only. This was intentionally designed this way to
> keep the Gate from
> toppling over in moderate to high winds. In high
> winds, the burlap/cement
> covering is designed to crack and peel off, allowing
> wind to pass through
> the structure, leaving the wooden frame intact.
> Repairs can then be made to
> the covering as needed. If any type of board is
> placed on the top structure,
> these boards will hold to the frame and, if the wind
> is high enough, bring
> the entire structure down.
> Design Consideration 2: Weight
> In order to keep the upper portion light, spliced
> 2x4's were used to span
> the gap between the columns. These span joists will
> not support weight
> greater than the burlap/cement covering without
> risking failure. The upper
> portion is connected to the structural columns with
> 1/2" steel bolts. These
> bolts will secure the upper portion to the columns
> safely. The upper portion
> is constructed, however, using 2 1/2" to 4"
> galvanized screws. While these
> screws are more than adequate for holding the
> framework together for the
> cement/ burlap covering, they are not capable of
> maintaining the structural
> integrity after the addition of additional boards.
> Alternative Completion 1: Original Design
> The gate can be completed, at least the first layer
> of burlap, in approx 40
> man-hours. The Shire Officers agreed at January's
> Officer Meeting to
> complete the Gate using the original design in the
> April/May time frame.
> This was to be cleared with King's Arrow Ranch and
> as far as I know, there
> is not any problem with this decision. All materials
> required for completion
> have already been purchased by the Shire.
> Alternative Completion 2: Modified Design -
> It was suggested at populace that the upper portion
> of the Gate be completed
> or covered with a "backerboard" material. I have
> "unofficailly" consulted
> with the structural engineers I work with. They have
> suggested that the Gate
> can completed this way IF the following design
> change criteria are met.
> 1. Replace the 4 - 2x4 spliced joists with 2x8
> (minimum), non-spliced
> members (20' length). 2x10 joist would be preferred
> for the distance spanned
> by the Gate. $80.00 plus shipping (freight) as this
> size member is only
> available in this area via special order.
> 2. Add additional nailing braces to the upper
> portion to met the 16" on
> center (o.c.) requirement for the backerboard as
> specified by the
> manufacturer. This would require an addition 48
> linear feet of 2x4's. $20.00
> 3. Backerboard is approx $9.00 for a 1/2"x3'x5'
> board. Approx 16 sheets
> would be required. $144.00.
> 4. Per the manufacturer, galvanized screws are
> required to be used at 6" o.c.
> to apply the backerboard. It was recommended to me
> that because of wind
> loads, we use 2 1/2" screws at 3" o.c. $40 approx
> for a 20lb pack.
> 5. Lag bolts and washers to attach new frame to the
> columns - $50.00.
> This method will add approx 500 pounds to the top of
> the structure. Based on
> wind calculations for that region of the country, we
> would also need to tie
> each column to a +/-3' deep anchor on both the front
> and rear of the gate.
> The tie would need to be 3/8" twisted steel cable at
> a 45 degree angle from
> within 12" of the top of the Gate.
> Depending upon the freight costs for the 2x8's, we
> will need to come up with
> approx $450 to modify the Gate design to use
> Alternative Completion 3: Modified Design - Plywood
> Most of what is mentioned as needing to be modified
> in Alternative 2 above
> applies to adding plywood instead of backerboard.
> Though the added weight
> will be slightly less, the wind considerations will
> be the same. Instead of
> 2x8's, we can likely get by using 2x6's. The approx
> cost for this option
> would be in the neighboorhood of $350.
> Pan Kazimierz Z³owieszczy
> Lordy Lord Kaz the Sinister
> Loch-Ruadh mailing list
> Loch-Ruadh at lists.ansteorra.org
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