STEEL DESIGN: TYPES OF ELEMENTS
IS 800:2007 classifies elements in to three types,
as per Cl. 3.7.3., as follows.
1. Internal elements
These
are elements attached along both longitudinal edges to other elements or to
longitudinal stiffeners connected at suitable intervals to transverse
stiffeners, for example, web of I-section and flanges and web of box section.
2. Outside elements or outstands
These are elements
attached along only one of the longitudinal edges to an adjacent element, the
other edge being free to displace out of plane, for example flange overhang of
an I-section, stem of T-section and legs of an angle section.
3. Tapered elements
These
maybe treated as flat elements having average thickness as defined in SP 6
(Part 1).
MAXIMUM EFFECTIVE SLENDERNESS RATIO
The maximum effective
slenderness ratio, as per Cl. 3.8 of IS 800:2007, KL/r values of a beam, strut or
tension member shall not exceed those given in Table 3 of IS 800:2007. 'KL' is
the effective length of the member and 'r' is appropriate radius of gyration
based on the effective section as defined in Cl.
3.6.1
of IS 800:2007. This data is reproduced here in Table 4.
Table
4 Maximum effective slenderness ratio
Member
: Maximum Effective Slenderness Ratio
(KL/r)
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 combination
with
wind/earthquake actions, provided the deformation of such member : 250
does
not adversely affect tbe stress in any part of the structure
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 possible reversal of stress into : 350
compression
resulting from the action of wind or earthquake forces
Members
always under tension (other than pre-tensioned members) : 400
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