Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: Torque vs. Tension in Bolts

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Thomas, you're correct about the anchor names I got wrong. I only added in
the brand example as an afterthought, and in haste got the names reversed.
Sorry. Thanks for alerting the list.   

I note that the maker claims superior shear value for this particular sleeve
anchor, and besides, it presents a smooth, full diameter surface to the hole
in the wood plate, rather than presenting thread tips that will crunch into
the wood and permit more shear wall sliding drift.  

That extra sliding drift (more gas on the fire) just might tip the relative
drift ratios between shear walls and diaphragm across the 50 percent line,
and thereby turn a "flexible" diaphragm "rigid" and invalidate the chosen
design procedure. I don't personally care, but any post-permit inquisitors
might make quite a crime of it. The 2000 IBC newly draws a mandatory
either/or distinction in this flexible vs. rigid business, with no gray
area, and forces a tributary diaphragm span distribution method on the
flexible version.  I posted a lot on this, early on 6/1/99, and my dismay
and embitterment expressed therein has not gone away, nor were my points
answered so as to stand revealed as incorrect in any particular.

At 02:08 PM 7/14/99 -0400, you wrote:
>     Charles,
>     The RED HEAD "Trubolt" looks like a regular wedge anchor.  Are you 
>     sure you did not mean the RED HEAD "Redi-Bolt" which is their heavy 
>     duty sleeve anchor??
>     Thomas Hunt
>Some models of sleeve anchor have a headed bolt within the outer sleeve, 
>instead of a male stud and nut. An advantage is that in event of removal 
>later, no stud or anything else projects above the concrete surface after 
>the bolt is unscrewed and loose outer sleeve lifted out. ITW Red Head 
>"Trubolt" is an example.   [see corrected name above --C.G.]
>Charles O. Greenlaw  SE   Sacramento CA