08-08-2012, 04:33 PM
GENERAL CONSTRUCTION IN STEEL — CODE OF PRACTICE
GENERAL CONSTRUCTION IN STEEL — CODE OF PRACTICE.pdf (Size: 9.98 MB / Downloads: 343)
Scope
1.1.1 This standard applies to general construction
using hot rolled steel sections joined using riveting,
bolting and welding. Specific provisions for bridges,
chimneys, cranes, tanks, transmission line towers, bulk
storage structures, tubular structures, cold formed light
gauge steel sections, etc, are covered in separate
standards.
1.1.2 This standard gives only general guidance as regards
the various loads to be considered in design. For the actual
loads and load combinations to be used, reference may
be made to IS 875 for dead, live, snow and wind loads
and to IS 1893 (Part 1) for earthquake loads.
1.1.3 Fabrication and erection requirements covered
in this standard are general and the minimum necessary
quality of material and workmanship consistent with
assumptions in the design rules. The actual
requirements may be further developed as per other
standards or the project specification, the type of
structure and the method of construction.
Erection Loads
All loads required to be carried by the structure or any
part of it due to storage or positioning of construction
material and erection equipment, including all loads
due to operation of such equipment shall be considered
as erection loads. Proper provision shall be made,
including temporary bracings, to take care of all stresses
developed during erection. Dead load, wind load and
also such parts of the live load as would be imposed
on the stricture during the period of erection shall be
taken as acting together with the erection loads. The
structure as a whole and all parts of the structure in
conjunction with the temporary bracings shall be
capable of sustaining these loads during erection.
Resistance to Horizontal Forces
In designing the steel frame work of a building,
provision shall be made (by adequate moment
connections or by a system of bracing) to effectively
transmit to the foundations all the horizontal forces,
giving due allowance for the stiffening effect of the
walls and floors, where applicable.
DESIGN OF TENSION MEMBERS
Tension members are linear members in which axial
forces act to cause elongation (stretch). Such members
can sustain loads upto the ultimate load, at which stage
they may fail by rupture at a critical section. However,
if the gross area of the member yields over a major
portion of its length before the rupture load is reached,
the member may become non-functional due to
excessive elongation. Plates and other rolled sections
in tension may also fail by block shear of end bolted
regions (see 6.4.1).