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Slenderness limit for beam to ensure lateral stability

 
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Kumar Devendra
SEFI Member
SEFI Member


Joined: 13 Jun 2016
Posts: 2

PostPosted: Thu Aug 01, 2019 6:15 pm    Post subject: Slenderness limit for beam to ensure lateral stability Reply with quote

Dear  Sefian's,

I have a querry

As per cl 23.3 of IS 456:2000 the max allowable distance between lateral restraint is min of 60b or 250b2/d


Considering b = 300 mm and d = 500 mm
60b = 60*300= 18000 mm
250b2/d =250*(300*300)/(500)= 45000 mm

Both values doesn't make any sense to me. Can anyone explain.
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syed_A
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Joined: 22 Oct 2011
Posts: 387
Location: Hyderabad

PostPosted: Fri Aug 02, 2019 10:47 am    Post subject: Reply with quote

Dear Engr
You have to consider as follows
1)     (L/b)          ≤ 60
2)     (L*d/b^2)  ≤ 250
here L is the clear distance between lateral restraints
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