PRE-ENGINEERED

BUILDING
Ar. Jamaica Mae A. Andaya

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 PRE-ENGINEERED
BUILDING
Pre-Engineered Buildings (PEB) are buildings
that are engineered at a factory and
assembled at the site.
Built-up sections are fabricated at the factory
to the exact size, transported to the site and
assembled at the site with bolted connections.
These structures are sometimes called 'metal
boxes' or 'tin sheds' by laymen - they are
essentially rectangular boxes enclosed in a
skin of corrugated metal sheeting.
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 PRE-ENGINEERED
BUILDING
Great speed is achieved because while the
foundations and floor slab are being
constructed, the beams and columns - the
structural system - are being fabricated in the
factory. Once the foundations and floor are
done, the columns are shipped to the site,
lifted into place by cranes, and bolted
together.

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 INDUSTRIAL
BUILDING

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 PHARMACEUTICAL FACTORY

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 APPLICATION
FACTORY WAREHOUSE

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 APPLICATION
COMMERCIAL SHOWROOM COMMUNITY HALL

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 APPLICATION
STADIUM AIRPORT HANGAR

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 COMPONENTS

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 COMPONENTS
The pre-engineered building is constructed with different
components and connections. Pre-engineered buildings
consist of different structural Steel members which are as
follows:
1. Primary Frame
The Primary frame which is used in PEB construction is an
assembly of built-up sections that form framing and consists
of trusses or castellated beams.
2. Secondary Structural Elements
The secondary structural elements are cold-formed
members in different shapes such as Z and C etc.
3. Roof and Wall Panels
The tin Shades and curtain walls made up of Glass and
rolled-formed Steel are generally used in roof and wall
panels.

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 COMPONENTS
4. Sandwich Panels
Sandwich panels are made up of three layers in which an all aluminium core is inserted
between two aluminum sheets. Components of Industrial Building
The different components of industrial buildings are as follows:

• Purlins • Bracket
• Sag rods • Column and Column base
• Principal Rafters • Girt Rods
• Roof Truss • Bracings
• Gantry Girders

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 STRUCTURAL SYSTEMS
This system consists of factory fabricated and factory-
painted steel column and beam segments that are
simply bolted together at site. The columns and
beams are custom-fabricated I-section members that
have an end plate with holes for bolting at both
ends.

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 ERECTION
The painted steel sections are lifted into place by
crane, and then bolted together by construction
workers who have climbed to the appropriate
position.
Usually, each connection calls for six to twenty bolts
to be installed. Bolts are to be tightened to exactly
the right amount of torque using a torque wrench.

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 FOUNDATIONS AND
FLOOR SLAB
The foundations for pre engineered metal buildings are made
with conventional concrete systems, usually open foundations.
Since these structures are usually quite large, they attract a fair
amount of wind forces. Wind can cause a net upwards force on
a building, called uplift.
Since these structures are very light the foundations are
designed to firmly anchor the structures to the ground,
preventing them from being blown away by the wind.
The floor system for industrial and storage buildings is usually a
thick (about 8" to 12" / 200 to 300mm) concrete grade slab that
rests directly on the prepared earth beneath it. The concrete
can be topped with a thin, abrasion resistant smooth coating
called an epoxy floor or polyurethane floor if desired.

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 CLADDING AND ROOFING
- THE BUILDING
ENVELOPE
The most economical cladding for these structures is
light corrugated metal sheeting, on both the roof and
the external walls. These steel sheets, barely 0.5mm
thick, are coated with an aluminum-zinc alloy for
corrosion protection on both sides, and come with
an attractive, durable paint finish on the outside.
These sheets are installed over a grid of purlins, a
steel member that rests on the main structural frame
and supports the roofing material. In pre-engineered
buildings, cold formed Z sections are the member of
choice for purlins.
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 CLADDING AND ROOFING
- THE BUILDING
ENVELOPE
Before installing the sheets, contractors will install
layers of insulation and vapor barriers. Rolls of glass
wool or mineral wool are the most common type of
insulation for such buildings. Since there is no inner
wall over which to fix these layers, a layer of
galvanized chicken wire mesh is first laid over the
purlins.

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 ADVANTAGES
There are many advantages of Pre Engineered Buildings, which are as follows,
Quality control is the main advantage as all the structural member are engineered beforehand,
standards of different codes also taken into consideration components are made in factory under the
supervision of Quality Control Engineer.
Lower cost due to the saving in design, manufacturing and on-site erection cost.
Minimizing time of construction due to the use of software for design of the structural components.
Low Maintenance due to use of standard quality of paints over steel members , which increases the
ability to withstand & finally the maintenance cost will be low as compare to conventional steel
building.
Quick Erection, as all the members are Pre Manufactured & skilled labor is used for connections of
different components.
Warranty on PEB, mostly warranty period of 20 years given by manufactures for PEB.

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 DISADVANTAGES:
Although PEB has many advantages in the field of Industrial structure still there are some
demerits of Pre-Engineered Buildings, which are as follows,

Rusting / Corrosion Sensitive, if the quality of steel used or paint used for coating steel
members is not of good quality, then it can damage the structure and thus reduce the life of
the structure.
Insulation Cost, as insulating the building to an agreeable benchmark will furthermore add to
your construction costs.
Appearance, Steel Sections can be unattractive when left exposed.

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 BUILDING EXAMPLES

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 BUILDING EXAMPLE

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 BUILDING EXAMPLE

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