Cable Clamps 3

[BSVBD]

We're installing a door in an existing PEMB where there is cable-brace.

I need to cut and relocate the cable and reclamp to a fabricated bracket, then anchor it to either the existing concrete slab or foundation wall, if possible.

Any good references for cable clamps with allowable load charts/values? Currently I'm checking into Granger and McMaster-Carr.

Any other recommendations when dealing with cable clamps and clamping?

 

[Lomarandil]

Just to add a little extra color, the efficiency loss when using cable clamps isn't directly related to the number of clamps, as mentioned above. Instead, it comes from the fact that even with the "live end" of the wire rope against the saddle portion of the clamp, the rope still ends up being crushed slightly -- causing a stress riser.

(The part of wire rope pressed against the U-bolt portion of the clamp crushes more. Hence why you "only saddle a live horse/don't saddle a dead horse")

Also, I've commonly heard that an effective E for wire rope is around 15,000 ksi (for new 6x19 IWRC wire rope, loaded moderately). Hanes Supply publishes a number of values in their "Wire Rope 101" document:

http://www.hanessupply.com/content/pdfs/wirerope101.pdf

I've also used reduced F.S. for wire rope in non-rigging applications (usually 3, when bracing temporary structures like bridge falsework). I'm curious about the prohibition for cable clamps mentioned... SteelSlugged, do you happen to have that reference handy?

 

[SteelSlugged]

ASCE 19-10 is referenced in the ASCE and IBC. Section 3.3.2 of ASCE 19-10 roughly states the end fittings shall develop ultimate strength greater than the specified nominal cable strength, which means thimble type end terminations with wire rope clamps are not allowed. That's a squirrelly way to effectively ban these types of connections. Previous versions of the code made no mention of the terminations, so it is a relatively new requirement.

Hopefully, the link below works. The last page is from the committee that wrote the code and explicitly state these types of end fittings are not allowed along with wedge type fittings.

Link

 

[Gumpmaster]

I second the suggestion for a spelter socket. It's probably the way to go for an application like this.

Look at the Tiger Brand wire rope design manual for other connections and the effective modulus of elasticity.

 

[Lomarandil]

Huh, good to know. Thanks SteelSlugged!