steel truss
TRANSCRIPT
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STEEL TRUSSES
WITH RIVETED AND WELDED JOINTS
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ROOF TRUSSES:
A truss is a structure comprising
five or more triangular units
constructed with straight
members whose ends are
connected at joints referred to
as nodes.
OR
A trusses consist of an assembly
of rigid but elastic members
jointed in form of triangles to act
as a beam.
Trusses mainly consist of FOUR elements:
Rafters to support the roofing material Purlins to provide intermediate support to rafters and Tie beam Strut
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TYPES OF ROOF TRUSSES:
TRUSSES TYPE
FIGURE DETAIL APPLICATION
KING POST TRUSS
The spacing of the
king post truss is
limited to 3m centre
to centre.
Span- 5-8mts
Queen post truss
Span- 8-12 meters
Combination of king and queen post.
Span- 18 meters
Note: King post, queen post , combination of both , mansard truss
are essentially wooden trusses
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TYPES OF ROOF TRUSSES:
TRUSSES TYPE
FIGURE DETAIL APPLICATION
Mansard roof truss
The upper pitch
(king post) varies
from 30 to 40 degree, and lower
pitch (queen post)-
60 to 70 degree.
COMPOSITE ROOF TRUSSES
The tension
member are of steel
and compress
member are of
timber.
Steel truss When exceed by Span- 10 meters
and timber truss
become heavy and
uneconomical.
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STEEL ROOF TRUSSES:
Steel roof trusses are for lager span as compared to wooden trusses.
Steel roof trusses are mainly fabricated with sections.
The angle sections are jointed together by rivets , welding or nuts and bolts.
Gusset plates are also used in connections.
Recently gusset plates are replaced by welding the members directly.
Steel trusses are fabricated from roll steel structural members such as channels, angles, T- section, circular and plates.
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STEEL ROOF TRUSSES:
Steel angle section trusses
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ADVANTAGE OF STEEL ROOF TRUSSES OVER TIMBER TRUSSES:
Steel trusses are more commonly used these days for all spans small or large since thy are :
a) More economical
b) No span restriction, while timber trusses are suitable for only up to
15-18 meters.
c) Light in weight and Easy to construct or fabricated in any shape.
d) Fire proof and termite proof
e) More rigid
f) Permanent
g) The sections of steel trusses are readily available in the required
dimensions, resulting in minimum wastage.
h) Steel trusses are easy to install.
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STEEL ROOF TRUSSES :
Steel roof trusses are used in industrial buildings, work shops and auditoriums for covering. Main types of roof covering are corrugated sheets, slate and tiles etc . The sheet are fixed on longitudinal member provided in between two trusses.
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TYPES OF STEEL ROOF TRUSSES :
The various shapes of these along with their suitability for different span ranges, are shown in figure:
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TYPES OF STEEL ROOF TRUSSES :
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TYPES OF STEEL ROOF TRUSSES :
KING POST TRUSS
QUEENPOST TRUSS
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TYPES OF STEEL ROOF TRUSSES :
FINK TRUSS
FINK TRUSS WITH CAMBER
COMPOUND FINK TRUSS
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TYPES OF STEEL ROOF TRUSSES :
FAN TRUSS
HOWE TRUSS
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TYPES OF STEEL ROOF TRUSSES :
HOWE SIX PANELS TRUSS
PRATT OR N- TRUSS GENERALLY USED FOR BRIDGES
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DETAILS OF STEEL ROOF TRUSSES :
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DETAILS OF STEEL ROOF TRUSSES :
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DETAILS OF STEEL ROOF TRUSSES :
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DETAILS OF STEEL ROOF TRUSSES :