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RE: Seismic Upgrades

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If the cable anchors are in fact Preformed anchors, they can be removed, the cable tightened, and the anchors reattached. One re-use is permitted. You can have them use a cable grip with come along and in line Dillon meter to put a specific pretension load in the cable. Riggers will know what to do. Regular iron workers may get lost.

Again, the dynamic capacity will be an unknown, but cable is inherently very ductile under normal to low strain rates. There is no research on high strain rate effects like blast loads on hardly any materials.

Regards,
Harold Sprague


From: "Jason W. Kilgore" <jkilgore(--nospam--at)leok.com>
Reply-To: <seaint(--nospam--at)seaint.org>
To: <seaint(--nospam--at)seaint.org>
Subject: RE: Seismic Upgrades
Date: Tue, 27 Jul 2004 10:20:14 -0500

TI 809-05 is EXACTLY what I need - thanks!  I've had -04 for a while, but I
somehow missed -05 in my search.

I assumed the braces were aluminum because:
1. They look like aluminum
2. They feel "light" with the little bit I could move them
3. A piece of steel with a relatively sharp 90 deg. corner (NOT a sharp
"knife" edge) was able to shave off little slivers of cable metal.

I may be wrong, and I will establish this with certainty on my next site
visit.  I did not test the connector strands, just the main brace strands.
I'll do more research on the connections and their dynamic capacity.

In addition, several of the braces were very loose (sagging).  I need to
determine if these connections can be tightened.

AT/FP: The structure is inside a protected perimeter, and we're able to
obtain required standoff at all but one corner. Parking encroaches about 2m into the required 25m standoff at that corner. Required hardening is just a
matter of calculations.

---
Jason Kilgore
Leigh & O'Kane, LLC
Kansas City, Missouri
> -----Original Message-----
> From: Harold Sprague [mailto:spraguehope(--nospam--at)hotmail.com]
> Sent: Monday, July 26, 2004 1:17 PM
> To: seaint(--nospam--at)seaint.org
> Subject: RE: Seismic Upgrades
>
> Jason,
>
> 1.  TI 809-05 is the document that you want for seismic.
> 2. The "Chinese finger trap" is probably made by Preformed Line Products
> in
> Cleveland.  The guy cable will fail prior to the connector for static
> loads.
> They have not tested with dynamic loading as far as I know. I would be
> surprised if the connectors are aluminum.  They are probably galvanized
> steel.
>
> As far as AT/FP goes, if you can not get the stand-off, the analysis is
> difficult. It is relatively easy to get the time history pressures due to
> a
> blast load. The problem is predicting strain rate effects and response in
> the milisecond range.
>
> Regards,
> Harold Sprague


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