INTRODUCTION
Built-up columns are used when
the heiĀht oÿ the column is such
that a rolled section cannot
provide a sufficiently larĀe radius
oÿ Āyration. Built-up columns
consist Āenerally oÿ two or ÿour
shapes connected toĀether by
cover plates perÿorated at intervals
with access holes.
PROPERTIES
● PHYSICAL PROPERTIES:
1. r = 7850 kg/m3 = 78.5 kN/ m3
2. E= 2x 105 N/ mm2
3. Poison ratio = 0.3
● MECHANICAL PROPERTIES:
PROPERTIES
1. DUCTILITY:
● Ability of material to change its shape without fracture
Mild steel - high ductility
High carbon steel - low ductility
2. TOUGHNESS & BRITTLE FRACTURE:
● Ability of material to resist (absorb) impact load like earthquake load, machine load etc…,
● Requires both strength and ductility
3. TEMPERATURE:
At high temp. Strength reduces
4. CORROSION:
Steel corrodes in moist air, sea water and acid. Adopted painting, metallic coating.plastic coating, using corrosion
resistant steel to resist corrosion
5. HARDNESS:
● Resistance of the material to intentions and scratching
● Brinell hardness, rockwell hardness number are used to measure hardness
6. FATIGUE:
● Damage of material to cyclic loading
● Occurs due to moving loads, vibration in bridge
ADVANTAGES
Advantages of steel beam constructions
● Recyclable
Structural steel is recyclable, unlike many other construction materials. This plays a biĀ part in
reducinĀ construction waste.
● Durable
Structural steel structures such as steel beams have a hiĀh strenĀth to weiĀht ratio, makinĀ it quite
durable. It can withstand hiĀher stress, as compared to an equivalent mass oÿ wood or stone,
without ÿracture. The durability oÿ structural steel structures is one oÿ the advantaĀes that makes it
desirable ÿor the construction oÿ tall skyscrapers and bridĀes.
● Corrosion and rust resistant
Construction material such as wood has a low liÿe expectancy as they are likely to Āet rotten ÿaster.
The chemical composition oÿ steel beams makes them resistant to corrosion and rust that may
otherwise affect the durability oÿ the structure. Due to this advantaĀe, the liÿe expectancy oÿ
structures made usinĀ steel beams is hiĀher as compared to other construction materials.
DISADVANTAGES
Disadvantages of steel beam constructions
● High maintenance cost
The cost oÿ maintenance oÿ steel beams is hiĀh. Coats oÿ expensive paints have to be applied reĀularly on
the surÿace oÿ the beams to prevent corrosion. This action to increase the resistance oÿ the steel beam
aĀainst corrosion adds to the cost oÿ maintenance oÿ the structure.
● Less resistant to fire
Steel beams have little resistance to fire as compared to concrete beams. In case oÿ fire, the strenĀth oÿ
steel beams Āets reduced, puttinĀ the structure at risk.
● Difficult to manoeuvre
Steel beams are heavier than wooden beams, makinĀ it difficult ÿor workers to work with them. It is also
difficult to manoeuvre steel beam structures. Thereÿore, saÿety becomes a biĀĀer concern at a construction
site when workinĀ with ste
3. INTRODUCTION
Built-up columns are used when
the height of the column is such
that a rolled section cannot
provide a sufficiently large radius
of gyration. Built-up columns
consist generally of two or four
shapes connected together by
cover plates perforated at intervals
with access holes.
3
5. PROPERTIES
1. DUCTILITY:
● Ability of material to change its shape without fracture
Mild steel - high ductility
High carbon steel - low ductility
2. TOUGHNESS & BRITTLE FRACTURE:
● Ability of material to resist (absorb) impact load like earthquake load, machine load etc…,
● Requires both strength and ductility
3. TEMPERATURE:
At high temp. Strength reduces
4. CORROSION:
Steel corrodes in moist air, sea water and acid. Adopted painting, metallic coating.plastic coating, using corrosion
resistant steel to resist corrosion
5. HARDNESS:
● Resistance of the material to intentions and scratching
● Brinell hardness, rockwell hardness number are used to measure hardness
6. FATIGUE:
● Damage of material to cyclic loading
● Occurs due to moving loads, vibration in bridge
5
6. ADVANTAGES
Advantages of steel beam constructions
● Recyclable
Structural steel is recyclable, unlike many other construction materials. This plays a big part in
reducing construction waste.
● Durable
Structural steel structures such as steel beams have a high strength to weight ratio, making it quite
durable. It can withstand higher stress, as compared to an equivalent mass of wood or stone,
without fracture. The durability of structural steel structures is one of the advantages that makes it
desirable for the construction of tall skyscrapers and bridges.
● Corrosion and rust resistant
Construction material such as wood has a low life expectancy as they are likely to get rotten faster.
The chemical composition of steel beams makes them resistant to corrosion and rust that may
otherwise affect the durability of the structure. Due to this advantage, the life expectancy of
structures made using steel beams is higher as compared to other construction materials.
6
7. DISADVANTAGES
Disadvantages of steel beam constructions
● High maintenance cost
The cost of maintenance of steel beams is high. Coats of expensive paints have to be applied regularly on
the surface of the beams to prevent corrosion. This action to increase the resistance of the steel beam
against corrosion adds to the cost of maintenance of the structure.
● Less resistant to fire
Steel beams have little resistance to fire as compared to concrete beams. In case of fire, the strength of
steel beams gets reduced, putting the structure at risk.
● Difficult to manoeuvre
Steel beams are heavier than wooden beams, making it difficult for workers to work with them. It is also
difficult to manoeuvre steel beam structures. Therefore, safety becomes a bigger concern at a construction
site when working with steel beams.
7
8. ROUND BARS -
Used as reinforcement in
concrete structures, construction
of steel grillage works, etc.
Available in various circular cross
sections of varying diameters.
TYPES ACCORDING TO SHAPES
SQUARE BARS-
Used in construction of steel grillage
works for windows. Available in various
cross sections of varying dimensions.
FLAT BARS -
Used in construction of steel grillage
works for windows and gates.
Available in widths varying from 10 mm
to 400 mm thicknesses varying from 3
mm to 40mm.
HEXAGON BARS-
Used in construction work of steel
grillage. Available in various cross
sections of varying dimensions.
8
9. T-SECTIONS-
Widely used as members of steel
roof trusses and to form built up
sections.It is designated by overall
dimension and thickness.
TYPES ACCORDING TO SHAPES
I-SECTIONS-
These are properly known as the rolled
steel joists or beams.It consist of two
flanges connected by a web.
CHANNELS-
Used as structural members of
steel-framed structures.Consists of
web with two equal flanges.
ANGLE SECTIONS-
Are manufactured in “L” shape. The
beams acquires their distinct L -
shape by having legs with unequal
lengths at 90 degree angle.
9
13. ● There are three types of installation
TYPES OF INSTALLATION
1. RIVETS 2. BOLTS 3. WELDS
13
14. RIVETING
SNAP HEAD RIVETS- This kind of
heads are used most of all.The
head is of a semi-circle in shape.
That is why it is widely used in
bridges made of iron material.
PAN HEAD RIVETS- The upper
portion of the rivet head is flat and
taper. Small diameter of the head is
equal to the diameter of the rivet.
COUNTERSUNK HEAD- At places
where it is necessary to keep the
surface plane even after fixing a
rivet, this type of rivets is used.
FLAT HEAD RIVETS- For small
and light jobs o sheet metal, flat
head rivets are used. These are
generally used in non-ferrous
metals and thin sheets. Its head
is flat.
HOLLOW RIVETS- Used where a
part of the machine moves and it is
also necessary to keep this part
attached to the machine.
CONICAL HEAD RIVET- The
conical shape is given is used for
light jobs. A conical shape is given
to the head by a hammer.
14
15. LAP JOINT-
The ends that fulfill the
operation of both
elements are such that
their surface overlaps
slightly. Then the riveting is
done through the
coincidence hole.
BUTT JOINT-
Two elements are joined in
a straight line from edge
to edge. The clamping is
built using an outer
casing plate, it is then
riveted upward through
parallel drilled holes.
RIVETING JOINTS
DOUBLE BUTT JOINT-
When two rows of rivets are
involved above a joint or when
two rows of rivets are used from
both the top and bottom in a
butt joint.
15
16. CHAIN RIVETED
JOINT-
The adjusted
rows of rivets may
be opposite each
other as opposed
to straight lines
ZIG-ZAG
RIVETED JOINT-
The lines here can
be staggered and
do not
complement each
other.
SINGLE RIVET
JOINT-
More than one rivet is
fixed along a line, usually
in a lap joint, while rows
in a butt joint can be
visible from both the
upper and lower
surfaces.
RIVETING JOINTS
DIAMOND RIVETED
JOINT-
The rivets are arranged in
rows that are wide at the ends
of the butt and taper at
opposite sides which give the
diamond shape of
considerable size. Usually, this
type of joint will be found in
the butt joints.
16
17. BOLTING
A bolted joint is a combination of a fastener and a nut…. The bolt is palace through a pre- cut hole in the
object, after which a nut is twisted and secured onto the mating thread at the end of the bo;t. The
combination of the bolt and nut is know as a bolted joint.
TYPES:
17
18. TYPES OF BOLTING
1. HEX - HEAD BOLT:
Hex- head bolts are bolts with hexagonal -
shaped head that can be tightened with a
wrench ( spanner) on socket, which
engages with the external faces of the hex
head.
2. SLOTTED HEX BOLT:
Slotted hex bolt are forgotten clamping bolts
used with slotted workpieces. They are
exceptionally strong. Steel is strong and durable
but less corrosion resistant than stainless steel
3. SOCKET HEAD BOLT:
A Socket cap bolt screw are a machine screw
with a cylindrical barrel shaped head
containing a hexagonal socket.
4. CHEESE HEAD BOLT:
A cheese head bolt is one with cylindrical head.
“Cheese head” bolt are defined by the their head
type. The cheese head has cylindrical sides with a
flat disc top and a flat bearing surface
5. FLAT HEAD BOLT :
They are conical with a flat outer face and a
tapering inner face. An advantage to this type of
screw is that very little of the head protrudes
beyond the surface, allowing it to sink into the
material.
6. PAN HEAD BOLT:
Pan head bolt are a common head type of non -
countersunk bolt head used in wood screw, self -
tapping screw, and machine screw.
18
19. ❖ Two types of high - strength bolted connection:
A. BEARING TYPES OF CONNECTION:
● Where connected parts are allowed to bear directly on the bolt
shank.
● hence both shear strength and bearing need to be checked
B. SLIP- CRITICAL TYPE CONNECTION (formerly known as friction -
type connection) :
● Where connected parts are no allowed to slip, and shear are
transmitted by friction force rather than direct shear.
● This connection requires high pre- tensioning force of bolts up to
their ‘proof load’ which is equal 70% of tensile strength
TYPES OF BOLTING CONNECTIONS
19
20. WELDINGS
● A Welding joints is apoint or edge where two or more
piece of metal or plastic are joined together
● They are formed by welding two or more work piece
( metal or plastic)_ according to a particular geometry
● Five types:
1. Butt joint
2. Corner joint
3. Edge joint
4. Lap joint
5. Tee joint
● These configurations may have various configurations may
have various configuration at the joint where actual
welding can occur.
20
24. STEEL COLUMN AND CONNECTIONS
STRUTS OF ONE OR TWO ANGLES -
The two angles of a double struts
are riveted together by rivets driven
through washers placed between
the two angles at intervals of 4 to 6
ft.
STARRED ANGLES -
Starred angles of two or four connected
by batten plate spaced at intervals of 3
to 4ft. These are used to support the
light loads.
ROLLED H - COLUMN-
These are obtainable with depths
ranging from 6" to 16" and are now
commonly used instead of built-up
columns in steel skeleton construction.
BUILT UP COLUMN-
These are usually of H-shaped
section formed by a combination
of plates and angles although
box columns with two or more
webs are not uncommonly used
in heavy building frames.
24
25. STEEL COLUMN AND CONNECTIONS
TOP CHORD SECTION -
Top Chord sections of heavy
trusses are usually
unsymmetrical and are made of
two rolled or built-up channel
sections and a cover plate. The
open (bottom) side of the section
is latticed.
COLUMNS FOR BENTS -
Columns for bents are sometimes made
up of a pair of channels and an I-beam
with batten plates at intervals of 3 to 4 ft.
connecting the flanges of the channels.
Columns made of four angles and a
web-plate are commonly used in mill
building bents.
BATTENED COLUMNS-
Battened columns are those in which two
component parts of the column are
connected only by batten plates. They are
decidedly inferior to latticed columns and
should be avoided if a continuous plate or
latticing can be used instead.
LATTICED COLUMNS-
Latticed Columns made up of
channels or angles connected by
lattice bars are often used where
light loads are to be supported
on long columns.
25
26. When a change in the nominal
size of a column occurs, a
thick butt plate welded to both
column sections is used to
transfer the load.
A backer plate can make
up the difference in
flange thicknesses at a
bolted connection.
As the load on a column
diminishes, different flange
thicknesses may be used at a
column-to-column connection.
Steel Column Connections
Column Splices
26
27. Column is welded to
its steel base plate
after the plate is
leveled on a bed of
non shrinking grout.
Stiffeners may be
required when a
column bears on a
thin base plate.
Base plates for
large columns are
set on leveling
nuts before
grouting.
A seismic foundation
connection utilizes
stiffener plates and
anchor bots set into a
concrete foundation.
Column Bases
27
28. STEEL BEAMS
PLATE GIRDERS-
A plate girder is a beam composed
of a wide plate, known as a web, at
the top and bottom of which are
riveted angles and plates. The
simplest type of plate girder
consists of a web and four flange
angles. If this does not give
sufficient flange area, cover plates
may be added. The web may be
frequently reinforced against
buckling by angles riveted to its
sides, known as stiffener angles.
BOX GIRDERS-
This is a built up beam in which
more than one web plate is used.
28
29. STEEL BEAM CONNECTIONS
1. RIGID FRAME CONNECTION
These are able to hold their original angle under loading by developing
a specified resisting moment, usually by means of plates welded or
bolted to the beam flanges and the supporting column.
29
30. STEEL BEAM CONNECTIONS
2. SHEAR CONNECTIONS
Simple Frame connections are made to resist only shear and are free to
rotate under gravity loads. Shear walls or diagonal bracing is required for
lateral stability of the structure.
30
31. STEEL BEAM CONNECTIONS
3. SEMI RIGID CONNECTIONS
Semi-Rigid Frame connections assume beam and girder connections
possess a limited but known moment resisting capacity.
31
32. ➢ Steel is very sustainable because once it is made, it can be used forever. Steel can be recycled an infinite amount of times
and be used with NO downgrading in quality.
➢ The non-renewable resources used to make steel, like minerals and fossil fuels, are not wasted because the steel will be
used forever.
➢ IS STEEL ENVIRONMENTALLY FRIENDLY…….?
➢ Yes, because once steel is produced, it’s lifecycle is potentially endless. As long as it is recovered after each product’s life
cycle, it is a permanent resource in society.
➢ Steel is 100% recyclable and is easily recovered by magnetic separation.
➢ There are two main sources of recycled steel, also called steel scrap:
➢ Pre-consumer scrap: excess material from steel production downstream manufacturing
○ 100% of scrap from steel production and downstream processing is collected and recycled directly into steel
production
➢ Post-consumer scrap: steel at the end of a product’s life
○ Post-consumer scrap has to be collected and prepared (for example by shredding and baling). Because of the high
value of steel scrap, there are also economic incentives that help to maintain high recycling levels
➢ Steel is the most recycled industrial material in the world, with over 500 metric tonnes recycled annually, including pre- and
post-consumer scrap. 32
IS STEEL ECO- FRIENDLY…………?
33. TECHNICAL ASSEMBLY
● The Built-up Beam Section bay is equipped
with Auto-Welding line conveyor system for
the manufacturing of various types of beams
such as “H”,“T”,“I”, BOX and PLUS type.
● The manufacturing facility is installed with
state-of-the-art material handling system with
cross bay trolleys, using hydraulic and
electrical operated roller conveyors and 18
EOT cranes with maximum SWL capacity of
25 tons to handle the structural steel safely
and efficiently.
● Our shop for the hot rolled beams is well
equipped with state of the art fully automatic
CNC controlled machines to process all types
of sections like plates, channels.
The production of built-up sections is a continuous
process and is equipped with:-
● 14 Saw welding machines
● 3 CNC profile cutting machines
● 2 I / H beam assembly machines
● 1 Flange straightening machine
● 1 Face milling machine used for column
assemblies
33
34. The manufacturing facility is fitted with state of the art material handling system along the bay and across the
bay with cross bay trolleys, hydraulic and electrical operated rollers conveyors, and 18 EOT cranes with
maximum SWL capacity of 25 tonnes to handle the structural steel safely and efficiently.
Flange width: 200-900 mm
Web height: 400 - 2000 mm
Length of beam: 4000 - 20000 mm
Flange thickness: 6 -100 mm
Web thickness: 6 -100 mm
Wlidth: 400mm x 400mm-900mm x 900mm
Length: up to 12000 mm
PLUS Beam Max Weight of Individual Piece: 35
Ton
Max size of column: 900 x 900 mm
Range of plates used: 16 -100 mm
Length of beam: 4000 -20000 mm
Width: 900 mm
Height: 400 - 2000 mm
Length: Up to 13000 mm
34
42. ● 10X15MM ● 10X20MM ● 5X10 MM
SHAPE ● ROUND ● ROUND ● HEXAGONAL ● DOME
● RS. 65/KG
● RS. 0.40 /PIECE
● RS.74/KG
● RS. 0.50/ PIECE
● RS. 95/KG
● RS. 0.30/ PIECE
● RS.85/KG
● RS. 1.89/PIECE
● WHITE ZINC
● HOT DIP
GALVANIZED
(HDG)
● BLACK
● FINISHED
POLISHED
● YELLOW ZINC
● NON -
POLISHED
● HOT - DIP
● ZINC
● PLAN COLOUR
(SELF)
● POLISHED
MARKET
SURVEY
ON
RIVETS TYPE
NAME:
RIVETS
COMPANY NAMES
SIZES
RATES
TYPES
AVAILABLE
SAMPLE
WAZIR CHAND
KRISHNA LAL
(PUNJAB)
E4 INDUSTRIAL
(PUNE)
● 4X36MM
RAZA INDUSTRIES
(DELHII)
PRACHI
ENTERPRISES
(MUMBAI)
42
43. COMPANY SIZE MATERIAL PRICE PICTURE
JINDAL
Universal
Beam AND
COLUMN,
pune
Length - 12m Hot rolled mild
steel
₹48,000/ton
Tosem Steel
Private
Limited, pune
Length - 12m Mild steel ₹54,000/ton
S. K.
International,
pune
Length - 6m Steel ₹49,000/ton
MARKET
SURVEY
ON
STEEL
COLUMNS
43
44. COMPANY SIZE MATERIAL PRICE PICTURE
S Mahipal
Steel,Bhosari,
Pune
100 x 50 mm Mild steel ₹ 50/ Kg
Mehta Steel
Syndicate,
Somwar Peth
Pune
Maharashtra
Length - 6m Mild steel ₹ 51/ Kg
T. T. & Sons,
Maharashtra
Length - 9.5m Mild steel ₹55/kg
MARKET
SURVEY
ON
STEEL
BEAMS
44
45. COMPANY SIZE MATERIAL PRICE PICTURE
Aceir steel ,
Pune
Length- 12m Mild steel ₹ 40/ Kg
Shri Hari
Trading
Company,
Pune
Maharashtra
Length - 8m Mild steel ₹ 65/ Kg
Vybrant Trading
Company,
Maharashtra
Length - 7m Mild steel ₹57/kg
MARKET
SURVEY
ON
STEEL
BEAMS
45