Correct Answer - Option 4 : 180
As per clause number 3.8 of IS 800:2007, table number 3:
i) The maximum effective slenderness ratio for the members always under tension (other than pre-tensioned members) shall not exceed 400
ii) Code also recommends that the tension members such as bracing’s pre-tensioned members to avoid sag, need not to be satisfy the maximum slenderness ratio limits.
Important Points:
Maximum slenderness ratios for tension members:
|
Type of Member
|
λ
|
|
A tension member in which a reversal of direct stress occurs due to loads other than wind or seismic forces.
|
180
|
|
A member normally acting as a tie in roof truss or a bracing system but subjected to a possible reversal of stresses resulting from the action of the wind or earthquake forces.
|
350
|
|
Member always under tension
|
400
|
Maximum slenderness ratios for compression members:
|
Type of Member
|
λ
|
|
A tension member in which a reversal of direct stress occurs due to loads other than wind or seismic forces.
|
180
|
|
A member carrying compressive loads resulting from dead loads and imposed loads.
|
180
|
|
A member subjected to compressive forces resulting only from combination with wind/earthquake actions, provided the deformation of such members does not adversely affect the stress in any part of the structure.
|
250
|
|
Compression flange of a beam restrained against lateral-torsional buckling.
|
300
|
|
A member normally acting as a tie in a roof truss or a bracing system not considered effective when subjected to a possible reversal of stresses resulting from the action of wind or earthquake forces.
|
350
|
