See also strut (disambiguation)
Strut (disambiguation)
A strut is a structural component.Strut may also refer to:* StRUT, a U.S. technology recycling organization* Strut , an annual fashion show in Leeds, UK* Strut , a vertical rule with no width...

A strut is a structural component designed to resist longitudinal compression. Struts provide outwards-facing support in their lengthwise direction, which can be used to keep two other components separate, performing the opposite function of a tie
Tie (engineering)
A tie, structural tie, connector, or structural connector is a structural component designed to resist tension. It is the opposite of a strut, which is designed to resist compression. Ties are generally made of galvanized steel...

. They are commonly used in architecture
Architecture is both the process and product of planning, designing and construction. Architectural works, in the material form of buildings, are often perceived as cultural and political symbols and as works of art...

 and engineering
Engineering is the discipline, art, skill and profession of acquiring and applying scientific, mathematical, economic, social, and practical knowledge, in order to design and build structures, machines, devices, systems, materials and processes that safely realize improvements to the lives of...

, for instance as components of an automobile chassis
A chassis consists of an internal framework that supports a man-made object. It is analogous to an animal's skeleton. An example of a chassis is the underpart of a motor vehicle, consisting of the frame with the wheels and machinery.- Vehicles :In the case of vehicles, the term chassis means the...

, where they can be passive braces to reinforce the chassis and/or body, or active components of the suspension.

An automotive suspension
Suspension (vehicle)
Suspension is the term given to the system of springs, shock absorbers and linkages that connects a vehicle to its wheels. Suspension systems serve a dual purpose — contributing to the car's roadholding/handling and braking for good active safety and driving pleasure, and keeping vehicle occupants...

 strut combines the primary function of a shock absorber
Shock absorber
A shock absorber is a mechanical device designed to smooth out or damp shock impulse, and dissipate kinetic energy. It is a type of dashpot.-Nomenclature:...

 (as a damper
In physics, damping is any effect that tends to reduce the amplitude of oscillations in an oscillatory system, particularly the harmonic oscillator.In mechanics, friction is one such damping effect...

), with the ability to support sideways loads not along its axis of compression, somewhat similar to a sliding pillar
Sliding pillar
A sliding pillar suspension is a form of independent front suspension for light cars. The stub axle and wheel assembly are attached to a vertical pillar or kingpin which slides up and down through a bush or bushes which are attached to the vehicle chassis, usually as part of transverse outrigger...

 suspension, thus eliminating the need for an upper suspension arm. This means that a strut must have a more rugged design, with mounting points near its middle for attachment of such loads.

The most common form of strut in an automobile is the MacPherson strut
MacPherson strut
The MacPherson strut is a type of car suspension system which uses the axis of a telescopic damper as the upper steering pivot. It is widely used in modern vehicles and named after Earle S. MacPherson, who developed the design.-History:...

. MacPherson struts are often purchased by the automakers in sets of four completed sub-assemblies: These can be mounted on the car bodies as part of the manufacturers' own assembly operations. The MacPherson strut combines a shock absorber and a spring in a single unit, by means of which each wheel is attached to the car body.

Lift strut
Lift strut
Nearly all biplane aircraft have their upper and lower planes connected by interplane struts which divide the wings into bays braced by diagonal wires...

s were commonly used in early aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air, or, in general, the atmosphere of a planet. An aircraft counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines.Although...

 to support wings, stabilizers, control frames in gliders and hang gliders, and in landing gear
Landing Gear
Landing Gear is Devin the Dude's fifth studio album. It was released on October 7, 2008. It was his first studio album since signing with the label Razor & Tie. It features a high-profile guest appearance from Snoop Dogg. As of October 30, 2008, the album has sold 18,906 copies.-Track...

. Since the 1930s they were mostly replaced with cantilever
A cantilever is a beam anchored at only one end. The beam carries the load to the support where it is resisted by moment and shear stress. Cantilever construction allows for overhanging structures without external bracing. Cantilevers can also be constructed with trusses or slabs.This is in...

 constructions, and became rare except in light aircraft. These structural members are frequently loaded in tension, but may vary between tension and compression as the aircraft maneuvers.

Struts are still widely used to attach the landing gear, particularly in retractable-gear aircraft, and provide damping during the takeoff and landing roll; here they are often called oleo struts
Oleo strut (aircraft suspension)
An oleo strut is an air–oil hydraulic shock absorber used on the landing gear of most large aircraft. It cushions the impacts of landing and while taxiing and damps out vertical oscillations.-Operation:...



Transportation-related struts are used in "load bearing" applications ranging from both highway and off-road suspensions to automobile hood and hatch window supports to aircraft wing supports. In vehicle suspension systems, struts are most commonly an assembly of coil-over spring and shock absorber. Other variants to using a coil-over spring as the compressible load bearer include support via pressurized nitrogen gas acting as the spring, and rigid (hard tail) support which provides neither longitudinal compression/extension nor damping.

Strut Channel
Strut channel
Strut channel, often referred to colloquially by one of several manufacturer trade names , is a standardized formed galvanized steel structural system used in the construction and electrical industries for light structural support, often for supporting wiring, plumbing, or mechanical components...

 made from Steel
Steel is an alloy that consists mostly of iron and has a carbon content between 0.2% and 2.1% by weight, depending on the grade. Carbon is the most common alloying material for iron, but various other alloying elements are used, such as manganese, chromium, vanadium, and tungsten...

, Aluminium
Aluminium or aluminum is a silvery white member of the boron group of chemical elements. It has the symbol Al, and its atomic number is 13. It is not soluble in water under normal circumstances....

, or Fibre-reinforced plastic
Fibre-reinforced plastic
Fibre-reinforced plastic is a composite material made of a polymer matrix reinforced with fibres. The fibres are usually fibreglass, carbon, or aramid, while the polymer is usually an epoxy, vinylester or polyester thermosetting plastic...

 is used heavily in the building industry and is often used in the support of Cable Trays
Cable tray
In the electrical wiring of buildings, a cable tray system is used to support insulated electric cables used for power distribution and communication. Cable trays are used as an alternative to open wiring or electrical conduit systems, and are commonly used for cable management in commercial and...

 and other forms of Cable Management
Cable management
Cable management refers to an important step during the installation of building services and the subsequent installation of equipment providing means to tidily secure electrical, data, and other cables...

, and pipes support systems.

See also

  • Cabane strut
    Cabane strut
    The cabane struts of a biplane aircraft support the upper wing over the fuselage and work in conjunction with other wing components such as spars and flying wires to transmit flight loads....

  • Chapman strut
    Chapman strut
    The Chapman strut is a design of independent rear suspension used for light cars, particularly sports and racing cars. It takes its name from, and is best known for its use by, Colin Chapman of Lotus....

  • Jury strut
    Jury strut
    The jury struts on a monoplane are small subsidiary struts that join the main wing struts to the wing.Jury struts are installed to eliminate unwanted resonance and vibration from the main wing struts and also to prevent main strut compression buckling under negative 'g' loads in the case of...

  • Lift strut
    Lift strut
    Nearly all biplane aircraft have their upper and lower planes connected by interplane struts which divide the wings into bays braced by diagonal wires...

  • MacPherson strut
    MacPherson strut
    The MacPherson strut is a type of car suspension system which uses the axis of a telescopic damper as the upper steering pivot. It is widely used in modern vehicles and named after Earle S. MacPherson, who developed the design.-History:...

  • Strut bar
    Strut bar
    A strut bar, strut brace, or strut tower brace is a mostly aftermarket car suspension accessory usually used in conjunction with MacPherson struts on monocoque or unibody chassis to provide extra stiffness between the strut towers....

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