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RE: Concrete Piles w/ an R = 1.0!![Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: "Struct. Eng. Assoc." <seaint(--nospam--at)seaint.org>
- Subject: RE: Concrete Piles w/ an R = 1.0!!
- From: Larry Hauer <lhauer(--nospam--at)live.com>
- Date: Fri, 24 Jul 2009 14:03:43 -0600
Thanks to Gerald and Steve for the input, and, yes, it is an SDC of E. I like the idea of using an R of 2.0 per Table 15.4-2 and have used this for open decks on hillside slopes, but chapter 15 is for "Nonbuilding Structures", and it seems that I am stuck with Chapter 12, ("Building Structures"), if we are underpinning an existing structure.|
Thanks agian to all,
Larry Hauer S.E.
Subject: Re: Concrete Piles w/ an R = 1.0!!
Date: Fri, 24 Jul 2009 10:53:00 -0700
On top of this, by using the Table 12.2-1 G criterion for ordinary moment resistant concrete frames, your system must be designed/detailed as such. By the same table, such systems are not permitted in SDC C or higher (where, I presume, your project is).
Assuming that the piles considerably project above the ground, I would try to consider the columns as true inverted pendulum structures (similarly to what Gerard is suggesting) per ASCE Table 15.4-2, R=2. IMO, this will still be conservative.
V. Steve Gordin, SE
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