To: seaint(--nospam--at)seaint.org, "Haan, Scott M." <HaanSM(--nospam--at)ci.anchorage.ak.us>
Subject: Clear space for no. 11 rebars in mat fou
From: Roger Turk <73527.1356(--nospam--at)compuserve.com>
Date: Fri, 22 Jun 2001 17:03:44 -0400
How is the aggregate supposed to get thru such space?
How is a vibrator going to get thru a 1/2" space?
And a 10 story building is going to be constructed on this foundation?
A. Roger Turk, P.E.(Structural)
Scott Haan wrote:
. > I have a permit for a 10 story building that has a mat foundation. The
. > special inspectors and municipal inspectors found horizontal number 11
. > bars with a 1/2 inch clear space during a foundation inspection today.
. > UBC 1907.6.1 says the spacing needs to be greater than db but not less
. > than 1 inch. UBC 1903.3.2 indicates the aggregate cannot be larger than
. > .75 times the clear spacing between bars. The concrete has aggregate
. > less than .75 inches. The EOR indicated he does not have a problem with
. > the reinforcement the way it is.
. > 1) Should the bars be moved to meet the 1 3/8 inch clear between bars
. > based on UBC 1907.6.1?
. > 2) Is the reason for the clear space between horizontal bars being the
. > bar diameter based on a development requirement?
. > 3) It seems 1 inch for the aggregate would be a good compromise. Would
. > it be completely off the wall to allow 1" between no. 11 bars with 3/4"
. > aggregate?
. > I am supposed to go look at it in an hour and give them an answer whether
. > they can pour this weekend.
. > Thanks for your opinions,
. > Scott M Haan P.E.
. > Plan Review Engineer
. > Building Safety Division http://www.muni.org/building
. > Development Services Department
. > Municipality of Anchorage
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