Return to index: [Subject] [Thread] [Date] [Author]

Re: Interpolation

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Ken
If you have determined Ru using the bending moment, you have two options to determine "p". i) use first principle equation to find out the required "p" from the given Ru & the material properties of concrete and steel., or ii) use any design handbook to find out the value of required "p" from the given Ru & the material properties. In the design handbook, the values of "p" is provided against the given value of Ru. For example you have the following situation:
for: Ru of 10 Kg/cm2, p= 0.3%
for: Ru of 12 kg/cm2, p= 0.45%
and you need to know ( interpolate ) "p" for a Ru of 11kg/cm2.
You know, for a difference value of Ru of 2kg/cm2 (12-10=2kg/cm2), there is a differernce value for "p" of +0.15% (0.45-0.30=0.15%).And, From a simple linear interpolation we have as follows:
2kg/cm2 of Ru=0.15% of "p"
1kg/cm2 of Ru=o.15%/2
            =0.075% of "p"
Now, for 10kg/cm2 of Ru= 0.3% of "p"
So, for  11kg/cm2 of Ru= 0.3% + 0.075% of "p"
                      =0.375% of "p"
Therefore, "p" would be=0.00375 for Ru value of 11kg/cm2
Now, Area of steel is :
As=p*b*d
Therefore, for a Ru value for 11kg/cm2, As = 0.00375*b*d.
Hope this explains your problem as requested.
SYED FAIZ AHMAD
SENIOR STRUCTURAL ENGINEER
SAUDI OGER LTD
RIYADH, SAUDI ARABIA


From: ken kirkland <kenmail234(--nospam--at)yahoo.com>
Reply-To: seaint(--nospam--at)seaint.org
To: seaint(--nospam--at)seaint.org
Subject: Interpolation
Date: Thu, 7 Jun 2001 16:16:19 -0700 (PDT)



I forgot how to do the interpolate to determine "p" and required reinforcement in concrete. Can some one please show me.
Thanks in advance.



---------------------------------
Do You Yahoo!?
Yahoo! Mail Personal Address - Get email at your own domain with Yahoo! Mail.

_________________________________________________________________________
Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.


* * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to:
*
*   http://www.seaint.org/sealist1.asp
*
* Questions to seaint-ad(--nospam--at)seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. Make sure you visit our web * site at: http://www.seaint.org