Need a book? Engineering books recommendations...

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

RE: Conc. Bond to plain steel

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Thanks to all for their input. Probably the most economical idea is a drilled hole thru 2 sides of the TS column towards the bottom with a 5/8" diam. threaded rod through the holes and nutted off. Certainly will resist the 4,000# uplift on the TS.
Thanks again,
Larry Hauer S.E.

From: Rhkratzse(--nospam--at)
Date: Wed, 12 Mar 2008 16:26:05 -0400
Subject: Re: Conc. Bond to plain steel
To: rgarner(--nospam--at); seaint(--nospam--at)

Well, I don't know from ring gears on flywheels, but I do know that they used to "set fire to" the steel tires of steam locomotives in the Old Days to expand them to shrink-fit back onto the wheels. 

Hoop rebar might prevent cracking, but it won't prevent shrinkage.  Without it a concrete "ring" trying to shrink around a nonshrinking steel tube will certainly crack.

I wouldn't depend on bond/friction.  Depending on the wall thickness of the tube, could you bash a few dents into it (not too close to the top) to provide keying, sort of like in a flywheel?


In a message dated 3/12/08 12:15:38 PM, rgarner(--nospam--at) writes:
That old dilemna: when a concrete ring shrinks, does the hole get bigger or smaller?  (Think of how they install ring gears on flywheels for the answer).  Will you put any hoop reinforcement in the footing to keep it from cracking away from the post?

It's Tax Time! Get tips, forms, and advice on AOL Money & Finance.

Helping your favorite cause is as easy as instant messaging. You IM, we give. Learn more.