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ychodneker General Sponsor
Joined: 11 Jan 2010 Posts: 21
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Posted: Sat May 11, 2019 3:04 pm Post subject: Deflection L/d ratio comparison for Concrete & Steel Beams |
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Dear Sefians,
Why is deflection for concrete cantilever limited to span/350 (IS 456:2000, Cl 23.2 a) & b))
While in case of steel cantilever deflection is limited to span/150 or soan/180 (IS800:2007, Table 6, Pg 31)
Why is it more stringent in case of concrete beams ? It increases the depth and rebar for cantilevers.
Request friends to throw some light on this.
Relevant Cl are attached along for reference.
Regards,
Yeshwant V. P. C.
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Deflection Criteria.docx |
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Dr. N. Subramanian General Sponsor
Joined: 21 Feb 2008 Posts: 5538 Location: Gaithersburg, MD, U.S.A.
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Posted: Sun May 12, 2019 1:31 pm Post subject: Re: Deflection L/d ratio comparison for Concrete & Steel Beams |
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ychodneker wrote: | Dear Sefians,
Why is deflection for concrete cantilever limited to span/350 (IS 456:2000, Cl 23.2 a) & b))
While in case of steel cantilever deflection is limited to span/150 or soan/180 (IS800:2007, Table 6, Pg 31)
Why is it more stringent in case of concrete beams ? It increases the depth and rebar for cantilevers.
Request friends to throw some light on this.
Relevant Cl are attached along for reference.
Regards,
Yeshwant V. P. C. |
Dear Er Yeshwabt
It is because of the creep of concrete. Due to creep the deflection of concrete cantilever beam will become twice that of static defection calculated by you!
Best wishes
Subramanian
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ychodneker General Sponsor
Joined: 11 Jan 2010 Posts: 21
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Posted: Sun May 19, 2019 3:25 pm Post subject: Thanks |
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Dear Dr. N. Subramanian,
Thanks for your reply.
Regards,
Yeshwant V. P. C.
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