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Effect of h/b limits on Lateral Torsional Buckling Bending Strength

 
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veereswara_rao_yeluguri
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Joined: 13 Apr 2018
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PostPosted: Fri Apr 13, 2018 2:35 am    Post subject: Effect of h/b limits on Lateral Torsional Buckling Bending Strength Reply with quote

In IS 800: 2007 the effect of imperfection for lateral torsional buckling is considered by Alpha factor which is dependent further on cross section type (Rolled or Welded Steel Section). Whereas , in case of EN 1993-1-1:2005 Alpha factor is dependent on Cross section type and also cross section aspect ratio (h/b). It is observed the aspect ratio has a significant impact on the design strength also.
Why IS 800:2007 is not considering such parameter and what exactly this parameter is representing?
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Dr. N. Subramanian
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PostPosted: Fri Apr 13, 2018 9:25 pm    Post subject: Re: Effect of h/b limits on Lateral Torsional Buckling Bending Strength Reply with quote

Dear Er Veereswara Rao,

Yes you are right. As per Euro code if h/b is greater than 2, the value of AlphaLT is increased (jumps to the next buckling curve). Of course due to this the value of fd will be reduced. But the comparison is not that simple. There is one more equation given in Clause 6.3.2.3 modifying AlphaLT to take into account the moment distribution between the lateral restraints of members. I think the IS code committee considered all this and simplified the equation.

Best wishes
NS

veereswara_rao_yeluguri wrote:
In IS 800: 2007 the effect of imperfection for lateral torsional buckling is considered by Alpha factor which is dependent further on cross section type (Rolled or Welded Steel Section). Whereas , in case of EN 1993-1-1:2005 Alpha factor is dependent on Cross section type and also cross section aspect ratio (h/b). It is observed the aspect ratio has a significant impact on the design strength also.
Why IS 800:2007 is not considering such parameter and what exactly this parameter is representing?
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