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RE: Clear space for no. 11 rebars in mat foundation [10 story bui lding]

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I guess you have to break a few eggs to make an omelette.

Scott M Haan P.E.
Plan Review Engineer
Building Safety Division http://www.muni.org/building
Development Services Department
Municipality of Anchorage
phone:907-343-8183  fax:907-249-7399
mailto:haansm(--nospam--at)ci.anchorage.ak.us



-----Original Message-----
From: Gerard Madden [mailto:GMadden(--nospam--at)mplusl.com]
Sent: Friday, June 22, 2001 12:54 PM
To: seaint(--nospam--at)seaint.org
Subject: RE: Clear space for no. 11 rebars in mat foundation [10 story
building]


Ouch !

>>> HaanSM(--nospam--at)ci.anchorage.ak.us 06/22/01 01:44PM >>>
Throughout.

Scott M Haan P.E.
Plan Review Engineer
Building Safety Division http://www.muni.org/building 
Development Services Department
Municipality of Anchorage
phone:907-343-8183  fax:907-249-7399
mailto:haansm(--nospam--at)ci.anchorage.ak.us 



-----Original Message-----
From: Gerard Madden [mailto:GMadden(--nospam--at)mplusl.com] 
Sent: Friday, June 22, 2001 12:34 PM
To: seaint(--nospam--at)seaint.org 
Subject: Re: Clear space for no. 11 rebars in mat foundation [10 story
building]


The clear spacing is to ensure adequate bond. You could treat it as a quasi
bundled bar and increase the splice/development lengths. Is this throughout
or in a couple of spots? If it is throughout and this is a ten story
building, I d be inclined to have them re-do it properly and become the
enemy in their eyes.

-gerard
SF, CA

>>> HaanSM(--nospam--at)ci.anchorage.ak.us 06/22/01 01:22PM >>>
Hello:


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
phone:907-343-8183  fax:907-249-7399
mailto:haansm(--nospam--at)ci.anchorage.ak.us 



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