Question

As per IS 800 : 2007, what is the maximum value of effective slenderness ratio of a beam / strut/ tension member for the following cases?

Case 1: Members carrying compressive loads resulting from dead loads and imposed loads.

Case 2: Members always under tension.

Case 3: Members subjected to compressive forces resulting from a combination of wind/earthquake actions.

1. Case 1: 180, Case 2: 400, Case 3: 250
2. Case 1: 250, Case 2: 350, Case 3: 300
3. Case 1: 250, Case 2: 350, Case 3: 400
4. Case 1: 200, Case 2: 250, Case 3: 400

Answer 1

Correct Answer - Option 1 : Case 1: 180, Case 2: 400, Case 3: 250

Concepts:

As per IS 800: 2007, Cl- 3.8, Slenderness ratio of steel sections is limited as per the following:

Member	Maximum Effective Slenderness ratio	Remarks
Pure Compression Member	180	Case 1
Pure tension Member	400	Case 2
Tension Member subjected to reversal of stress due to loads other than wind and earthquake.	180
Tension Member subjected to reversal of stress due to wind or earthquake load.	350
A member subjected to compression forces resulting from wind or earthquake forces provided that deformation of such member does not affect the stress in any part of structure.	250	Case 3
Compression flange of beam against lateral torsional buckling	300