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Daily Digest Wed Jan 14 23:00:02 2004

 
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bhagwat at afconsindia...
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PostPosted: Thu Jan 15, 2004 5:30 am    Post subject: Daily Digest Wed Jan 14 23:00:02 2004 Reply with quote

Dear Mr. Upadhyay,
Shear stress, especially the flexural shear (which I think is the one
concerned in your query) will arise only if there is a variation in moment
along the length of the member (column). Once the presence of moment is
acknowledged, we'll have to refer to the codal formula for beams,
considering the reinf on the appropriate "tension face" as %pt.
Although the table 23 gives the value of Tau c starting from some minimum
%ge, for lesser reinf one can/should use the formula given in the
Explanatory handbook.
You could also use the following very simple user-defined-function/macro in
an Excel spreadsheet or an equivalent formula -

     Function TAUC(PERCSTEEL As Single, fck As Single) As Single
         If 0.1161 * fck / PERCSTEEL < 1 Then ' Evaluate argument.
             BETA = 1
         Else
             BETA = 0.1161 * fck / PERCSTEEL
         End If
         TAUC = 0.1267 * Sqr(fck) / BETA * (Sqr(5 * BETA + 1) - 1)
     End Function

You would find that for a lower %ge of steel, the tau_c works out to less
than the minimum value given by codal table. For this reason I am not in
agreement with Mr. Sakthivel's advice.
Further the tauc will be increased due to the existence of the axial
compressive load in the normal fashion.
Hope the above helps.
With regards,
D. G. Bhagwat
AFCONS

Quote:
-----Original Message-----
From: general@sefindia.org [mailto:general@sefindia.org]
Sent: Wednesday, January 14, 2004 10:53 PM
To: bhagwat@afconsindia.com
Subject: Daily Digest Wed Jan 14 23:00:02 2004


----------------------------------------------------------
From: sp.sakthivel@bhagwatis.com
Subject: Daily Digest Tue Jan 13 23:00:02 2004
Date: 14/01/04
Time: 11:55:56
----------------------------------------------------------
Mukesh Upadhyay
Question: Hello
What should be the shear strength of concrete, for
a column in which all reinforcement is in compression.

Ans:

Dear Upadhyay,

If all Reinforcement is in compression means Ast = 0 Sq.mm,

if  Ast is zero, Percentage of  tensile reinforcement is Zero,

Please refer the table 19 or 23 of IS 456 : 2000

for 100As/bd less than or equal to 0.15 the permissible shear strength of
concrete is given
in table.
For example for M15 grade concrete the value is 0.18 N.mm2 (from table 23)

Hope this explanation will clear to you

Best  Regards


S.SAKTHIVEL


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