As per IS 800: 2007, what is the maximum value of effective slenderness ratio of beam/strut/tension member for the following cases? Case 1: Members carrying compressive loads resulting from dead loads and imposed loads. Case 2: Members are always under tension. Case 3: Members subjected to compressive forces resulting from a combination of wind/earthquake actions.
Right Answer is:
Case 1 : 180, Case 2 : 400, Case 3:250
The maximum value of effective slenderness ratio of beam/strut/tension member
|Member||Max. effective slenderness ratio|
|A member carrying compressive loads resulting from dead loads and imposed loads.||180|
|A tension member in which a reversal of direct stress occurs due to loads other than wind or seismic forces.||180|
|A member subjected to compression forces resulting only from the combination with wind/earthquake actions, provided the deformation of such member does not adversely affect the stress in any part of the structure.||250|
|Compression flange of a beam against lateral-torsional buckling.||300|
|A member normally acting m a tie in a roof truss or a bracing system not considered effective when subject to a possible reversal of stress into compression resulting from the action of wind or earthquake forces.||350|
|Members are always under tension (other than pre-tensioned members).||400|
As per table 3, IS 800 2007, the maximum slenderness for compressive members is 180, for purely tensile members is 400 and for members subjected to compressive loads due to only wind/earthquake is 250.