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Design Shear Strength of beams as per IS 456

 
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adutt
Progressive Member
Progressive Member


Joined: 26 Jan 2003
Posts: 43

PostPosted: Wed Oct 27, 2004 9:01 am    Post subject: Design Shear Strength of beams as per IS 456 Reply with quote

Dear Sefians,

The Design Shear Strength of beams as per IS 456
:2000 is given in table 19 of IS 456 . It is based on a formula based on
work by Rangan (Rangan B.V., Diagonal cracking strength in Shear of R.C.

Beams,"Transactions,Institution of Civil  Engineers, Australia ,Vol. CE
14 ,No. 1 ,April 1972).The equation is available in standard textbooks &
S.P. 16



My question is that the above  equation does not account for whether the
member is subjected to significant axial tension or axial tension unlike
equations given by foreign codes. Please refer Australian Code AS
3600-2001 :Concrete Structures, Clause 8.2.7.1

& U.S. code ACI 318 -99.Clause 11.3.1 . Why do semi empirical &
empirical equations given in codes vary to a large degree from country
to country ,are they based on testing of the structures ? If the basic
principles of structural mechanics do not change from a country to
country why do the these equation vary so much ?Can someone throw light
on how these semi empirical equations are arrived at?



With Regards



Amit Dutt

Structural Engineer

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