NATIONAL ALUMINIUM COMPANY LIMITED - Rites

12.0 LOADING
For consideration of loads on structures IS : 875 - ‘Code of practice for structural sa safety of
buildings’ shall be followed. In addition to the dead load, live load, equipment load
(including impact / vibration). Temperature loads etc. various loading conditions arising due
to operation and maintenance of equipment shall be considered in the design. The structure
and equipment shall also be designed for seismic loads as per the “Criteria for Earthquake
Resistant Design of Structures and equipment" and the “Criteria for Wind Resistant Design of
Structures and equipment" specified in the Annexu Annexure re A and B respectively in Civil Section,
whichever is governing. Wind and seismic forces shall not be considered to act
simultaneously. The following minimum live loads shall be adopted for the design of various
structures. If actual expected load is more than the specified load, then actual load is to be
considered
a )Roofs 150 Kgs. / Sq. M. for accessible roofs and 75 Kgs. / Sq. M. for non
accessible roofs. In addition to this coal dust load of 150 KKgs.
gs. / sq. m. shall also be
considered.
b ) R. C. C. floors 500 Kgs. / Sq. M.
c ) Stair and balconies 500 Kgs. / Sq. M.
d ) Toilet rooms 200 Kgs. / Sq. M.
e )Chequered plate floors 400 Kgs. / Sq. M.
f ) Walkways ( including walkways in 300 Kgs. / SSq.
q. M.conveyor galleries )
g)Conveyor galleries In addition to the live loads, loads due to cable trays, fire fighting /
service water pipes shall also be considered @ 125 Kgs. / m ( minimum ) on each of the
longitudinal girder. Roof Roof-truss members are to o be checked for supporting fire fighting
pipes/Service water pipes.
h ) Road Culverts and its allied For class 'AA' loading and checked for structures including R.
C. C. pipe class A loading as per IRC standard crossing & road crossing of trenches.
i ) Channels / trenches In addition to earth pressure and water pressure, etc. additional
earth pressure due to surcharge of 2T / Sq. M. shall
j ) Covers for trenches/channels Covers for channels & trenches, shall be designed for a live
load of 0.4T Sq.M. M. &loading mentioned under clause in trenches, whichever is critical.
k ) Sumps and tanks and other In addition to earth pressure with a underground basement
type surcharge of 2T / Sq. M. (or surcharge structures due to Railway loading whichever
is critical for Railway load bearing structures etc.) and sub - soil water pressure etc. These
are also to be designed for the following conditions :
i ) Water / liquid inside and no earth outside (applicable only to such structures which are
liable to be filled up with water or any liquid ).
ii ) Earth with surcharge outside and no water / liquid inside
iii ) For underground (basement) structures protection against buoyancy during execution
and after execution shall be ensured without superimposed loadings with minimum factor
of safety of 1.2 against buoyancy.
l ) Unit weight of coal shallbe taken as 1100 Kgs. / cum. Fordesign purposesIf the er erection
load is higher than the specified live loads on any floor or part thereof,then the erection
loads are to be considered for the design.Permissible increase in stresses of materials and
bearing pressure of soil due to windload or seismic load shall be as per relevant I. R. S. and I.
S. code.
13.0 DESIGN CRITERIA
The loads for all railway load bearing structures e. g. track hopper includingmachinery
hatches, wagon tippler, tunnel and under ground transfer houses etc. and the analysis and
the design of these structures shall be made strictly in accordancewith the pr provisions of
Indian Railway Bridge rules (latest edition), and Indian RailwayCodes of practice (latest
Technical Specification:Sec-7, Civil
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