When building a steel structure, the first thing you need to consider is the structure type. There are several different types of metal buildings, and each has its own advantages and drawbacks. The size of the structure and the scope of the project will ultimately determine which type of metal building structure you will need.
Steel Structural Building Types
It’s important to understand which types of
structural steel buildings are available to choose the right one for your
Metal Arched Buildings (Quonset Hut)
buildings, also known as the Quonset hut, are the most recognizable type of
metal building because of their unique shape. Their half-circle design makes
them exceptionally lightweight, durable and easy to assemble.
hut was the inspiration for all types of modern arched metal buildings.
hut was originally designed in the U.S. based off of the Nissen hut design the
British introduced in World War I.
lightweight design and prefabricated nature of the building allowed for
thousands to be produced during World War II. Military surplus was sold to the
public, and many huts were used for residential purposes.
Quonset hut was first developed, the U.S. Navy was looking for a lightweight,
all-purpose building that could easily be assembled anywhere and without
skilled labor. This arched-style metal, prefabricated building fit the bill.
Quonset hut design was 16’ x 36’ and framed with steel members that had an 8’
radius. Typically, these arched buildings had a standard size of 20’ x 48’ with
a 16’ radius. This provided 960 square feet of usable space and the option to
include 4’ of space in overhangs.
were also developed, with some of the most common being:
Quonset huts were constructed with corrugated steel sheets. The ends were
covered in plywood with doors and windows. Interiors were insulated and
featured wood flooring. The arched design of the structure allowed it to be
placed directly onto pilings, concrete or the ground.
buildings are self-supporting, so there’s no need for interior beams, columns
or trusses. Because the interior space was open, the hut could be used for a
variety of purposes, including:
installation and simple design of the structure allows it to be easily
disassembled and relocated. The structure may also be expanded or renovated
with relative ease because there are no interior columns that need to be moved.
are many variations of the Quonset hut design, including those with vertical
and angled side walls. Modern designs also incorporate windows into the side of
Rigid Frame Structures
frame metal building has a load-resisting skeleton with connections that are
designed to bear shear forces and bending moment. They are full, continuous
frames made without hinges or pins in the crowns and mid-span. Rigid frame
construction is also known as moment-resisting or fixed frame construction.
Rigid frame metal buildings are supported by large, rigid foundations that carry and distribute the shear and moment to the ground.
The frame’s rigid connections provide stability in at least one direction and transfer moment forces down to the foundation.
Just as its
name suggests, the connections in a rigid frame structure are rigid. The design
of the frame allows shear forces and beam end moments to be transferred to
columns without the need for bracing systems.
structures look similar to post and beam structures, but they offer added
strength and the ability to hold vertical loads. Much like a conventional
building, rigid frame structures offer design flexibility. Doors and windows
can be placed wherever the builder wants, and heating and cooling units can be
placed either on the roof or the side of the structure.
frame building can be used for a variety of applications, including:
Agricultural equipment storage
type of structure, the connections are more complex compared to other types of
metal buildings. The complexity of the connections can complicate the
construction process and increase the cost of the building. However, the added
durability and strength of the structure often outweigh the additional costs
and erection complications.
Clear Span Buildings
A clear span
structure is self-supporting, so no support columns are required when erecting
the building. Just as its name suggests, clear span buildings are clear of
obstructions and entirely open inside.
steel is the strongest building material available, it’s able to extend farther
than any other material without any support columns.
In fact, the AT&T Stadium in Arlington, TX has the largest clear span roof structure.
It covers 3 million square feet (73 acres) under its single roof. The stadium’s roof and structures were made with 14,000 tons of structural steel.
clear span structures do not require support columns, the interior layout is
truly open and flexible in terms of design. For this reason, clear span
structures are the go-to choice for:
uninterrupted interior space makes it a practical choice for industries with
massive storage requirements. However, it’s also a practical option for
retailers and office spaces because businesses can adapt the space to meet
their current needs. The layout of the interior can easily be moved around
without having to make any structural changes.
Clear span structures can span between 60’ and 120’ wide.
In special circumstances, they can go wider. These structures have a slope from the middle to the sides, and feature tapered columns to maintain strength and durability.
frames can have a low, medium or high profile.
Slope between 1/4:12 to 1:12
Slope between 2:12 and 3:12
Slope of 4:12
Clear span construction offers maximum flexibility and versatility. Much like arched buildings, they can easily be dismantled and relocated, or they can be expanded with relative ease and little cost.
two main types of clear span structures: single span and multi span. All clear
span structures require a rigid frame system.
Single Span Buildings
rigid frame buildings can range anywhere from 12’ to 30’ wide and 10’ to 24’
high. They’re ideal for smaller buildings that require large, expansive heights
at the middle. The interior is free and clear of obstructions, allowing users
to maximize their internal space.
buildings can be used for retail space, warehouses, industrial use, churches,
agribusiness and more. The open interior layout makes it versatile and
The largest and widest steel structures require multi-span construction. Multi-span buildings – sometimes known as continuous-beam, modular frame or post-and-beam – can expand as wide as 300 feet (sometimes more).
structures may have straight or tapered columns. When tapered columns are used,
they are placed on the exterior of the structure. Rafters are pinned, tapered
members and not full-moment connections. The columns in the structure are
designed strictly for axial loads.
building movement is possible with a multi-span structure. This type of
structure is also less flexible in terms of expansion or renovation. Once the
columns have been set, it’s difficult and expensive to move them.