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Embedded Anchor Bolts In Compression[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Embedded Anchor Bolts In Compression
- From: Bill Polhemus <bpolhem(--nospam--at)swbell.net>
- Date: Mon, 23 Oct 2000 17:26:51 -0500
I know we talked a little about this a few months back, but now that I have a little more knowledge (a "little knowledge" being, of course, a dangerous thing) about the topic, I'd like to recast the question I asked before. In some instances there are advantages to NOT grouting structural column base plates. For example, our stated DOT does not allow grouting of column base plates for overhead traffic sign structures, which are typically hollow sections and have cables or conduit running up into them from the bottom (the base plates have concentric openings to allow this). They are afraid that condensed moisture will build up inside the columns and cause accelerated corrosion. Thus, no grout under the base plates, and the compression AND tension forces are carried by the anchor bolts, the plate resting on the levelling nuts. An embedded anchor bolt in compression would tranfer the column forces into the concrete pedestal by bearing on the nut at the bottom of the bolt. But these forces are bound to be large, and using the ACI code-calculated bearing strength of the concrete under the nut (ACI 318-10.17.1) is not going to be sufficient for such a force. Does anyone have any experience with this? What did you use to determine adequacy? I seem to recall that research into anchor bolt failure mechanism showed that, because of localized confinement, the bearing at the nut allowed was typically on the order of many times the ACI 318 code calculation, when the bolt is in tension. Not sure if the same would apply here. Look forward to your input.
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