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Re: Landslide -pier tie spacing[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: Landslide -pier tie spacing
- From: Anand Nene <AnandNene(--nospam--at)aol.com>
- Date: Thu, 12 Mar 1998 14:06:43 EST
In a message dated 98-03-12 01:39:43 EST, you write: << Why you would require the extra ties when the capacity of the concrete is probably 10 times greater than the capacity of the soil so it is really impossible to generate enough axial load in the column to cause a concrete failure is beyond me. But then again, I'm not a plan checker! >> But you are S. E. and designer are you not? I do not know what the plan checker would ask for this requirement. He probably has a good reason. However, I would favor having closer ties regardless of the fact that concrete is stronger than soil . Most contractors purchase the spiral ties and rebar cage directly from shop. The relative cost of having closer ties is insignificant. I would not go as close at 4" spacing on residential projects for practical reasons unless the forces are really high and closer ties are necessary and you will have really good control over concrete pouring operation. Some earlies posts to this thread commented about 12 dia. piers with 4#4 bars. I would rather provide 1#7 or #8 in the center if the site is nearly level and the lateral forces are really small. Of course, I tie all the piers with grade beams. Otherwise, a 16" dia. pier with 4#5 is the minimum size I specify on my projects. Anand Nene, S. E.
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