Steel frame in the context of Tower block

Steel is an alloy of iron and carbon that demonstrates improved mechanical properties compared to the pure form of iron. Due to its high elastic modulus, yield strength, fracture strength and low raw material cost, steel is one of the most commonly manufactured materials in the world. Steel is used in structures (as concrete reinforcing rods or steel beams), in bridges, infrastructure, tools, ships, trains, cars, bicycles, machines, electrical appliances, furniture, and weapons.

Iron is always the main element in steel, but other elements are used to produce various grades of steel, demonstrating altered material, mechanical, and microstructural properties. Stainless steels, for example, typically contain 18% chromium and exhibit improved corrosion and oxidation resistance versus their carbon steel counterpart. Galvanized steel is coated in a layer of zinc to achieve a similar effect. Under atmospheric pressures, steels generally take on two crystalline forms: body-centered cubic and face-centered cubic; however, depending on the thermal history and alloying, the microstructure may contain the distorted martensite phase or the carbon-rich cementite phase, which are tetragonal and orthorhombic, respectively. In the case of alloyed iron, the strengthening is primarily due to the introduction of carbon in the primarily-iron lattice, inhibiting deformation under mechanical stress. Alloying may also induce additional phases that affect the mechanical properties. In most cases, the engineered mechanical properties are at the expense of the ductility and elongation of the pure iron state, which decrease upon the addition of carbon.

A skyscraper is a tall building with many habitable floors. Most modern sources define skyscrapers as being at least 100 metres (330 ft) or 150 metres (490 ft) in height, though there is no universally accepted definition, other than being very tall high-rise buildings. Skyscrapers may host offices, hotels, residential spaces, and retail spaces. Skyscrapers are a common feature of large cities, often due to a high demand for space and limited availability of land.

One common feature of skyscrapers is having a steel frame that supports curtain walls. These curtain walls either bear on the framework below or are suspended from the framework above, rather than resting on load-bearing walls of conventional construction. Some early skyscrapers have a steel frame that enables the construction of load-bearing walls taller than those made of reinforced concrete. Modern skyscraper walls are not load-bearing, and most skyscrapers are characterized by large surface areas of windows made possible by steel frames and curtain walls. However, skyscrapers can have curtain walls that mimic conventional walls with a small surface area of windows. Modern skyscrapers often have a tubular structure, and are designed to act like a hollow cylinder to resist wind, seismic, and other lateral loads. To appear more slender, allow less wind exposure and transmit more daylight to the ground, many skyscrapers have a design with setbacks, which in some cases is also structurally required.

Framing, in construction, is the fitting together of pieces to give a structure, particularly a building, support and shape. Framing materials are usually wood, engineered wood, or structural steel. The alternative to framed construction is generally called mass wall construction, where horizontal layers of stacked materials such as log building, masonry, rammed earth, adobe, etc. are used without framing.

Building framing is divided into two broad categories, heavy-frame construction (heavy framing) if the vertical supports are few and heavy such as in timber framing, pole building framing, or steel framing; or light-frame construction (light-framing) if the supports are more numerous and smaller, such as balloon, platform, light-steel framing and pre-built framing. Light-frame construction using standardized dimensional lumber has become the dominant construction method in North America and Australia due to the economy of the method; use of minimal structural material allows builders to enclose a large area at minimal cost while achieving a wide variety of architectural styles.

A tower block, high-rise, apartment tower, residential tower, apartment block, block of flats, or office tower is a tall building, as opposed to a low-rise building and is defined differently in terms of height depending on the jurisdiction. It is used as a residential or office building, or has other functions, including hotel, retail, or with multiple purposes combined. Residential high-rise buildings are also known in some varieties of English, such as British English, as tower blocks and may be referred to as MDUs, standing for multi-dwelling units. A very tall high-rise building is referred to as a skyscraper.

High-rise buildings became possible to construct with the invention of the elevator (lift) and with less expensive, more abundant building materials. The materials used for the structural system of high-rise buildings are reinforced concrete and steel. Most North American–style skyscrapers have a steel frame, while residential blocks are usually constructed of concrete. There is no clear difference between a tower block and a skyscraper, although a building with forty or more stories and taller than 150 metres (490 ft) is generally considered a skyscraper.

A frame is often a structural system that supports other components of a physical construction and/or steel frame that limits the construction's extent.

Frame and FRAME may also refer to:

Broadcasting House is the headquarters of the BBC, in Portland Place and Langham Place, London. The first radio broadcast from the building was made on 15 March 1932, and the building was officially opened two months later, on 15 May. The main building is in Art Deco style, with a facing of Portland stone over a steel frame. It is a Grade II* listed building and includes the BBC Radio Theatre, where music and speech programmes are recorded in front of a studio audience.

As part of a major consolidation of the BBC's property portfolio in London, Broadcasting House has been extensively renovated and extended. This involved the demolition of post-war extensions on the eastern side of the building, replaced by a new wing completed in 2005. The wing was named the "John Peel Wing" in 2012, after the disc jockey. BBC London, BBC Arabic Television and BBC Persian Television are housed in the new wing, which also contains the reception area for BBC Radio 1 and BBC Radio 1Xtra (the studios themselves are in the new extension to the main building). In February 2024, BBC Radio 2 and BBC Radio 6 Music moved their operations into the Peel Wing, opposite the BBC Radio 1 studios on the eighth floor; this was facilitated by converting office space within the building, after the BBC decided to move the radio stations out of Wogan House.

The Surrogate's Courthouse (also the Hall of Records and 31 Chambers Street) is a historic building at the northwest corner of Chambers and Centre Streets in the Civic Center of Manhattan in New York City, New York, U.S. Completed in 1907, it was designed in the Beaux Arts style. John Rochester Thomas created the original plans while Arthur J. Horgan and Vincent J. Slattery oversaw the building's completion. The building faces City Hall Park and the Tweed Courthouse to the south, as well as the Manhattan Municipal Building to the east.

The Surrogate's Courthouse is a seven-story steel-framed structure with a granite facade and elaborate marble interiors. The architects used a fireproof frame so the structure could safely accommodate the city's paper records. The exterior is decorated with 54 sculptures by Philip Martiny and Henry Kirke Bush-Brown, as well as three-story colonnades with Corinthian columns along Chambers and Reade Streets. The basement houses the New York City Municipal Archives. The fifth floor contains the New York Surrogate's Court for New York County, which handles probate and estate proceedings for the New York State Unified Court System.

A diagrid (a portmanteau of diagonal grid) is a framework of diagonally intersecting metal, concrete, or wooden beams that is used in the construction of buildings and roofs. It requires less structural steel than a conventional steel frame. Hearst Tower in New York City, designed by Norman Foster, uses 21 percent less steel than a standard design. The diagrid obviates the need for columns and can be used to make large column-free expanses of roofing. Another iconic building designed by Foster, 30 St Mary Axe, in London, UK, known as "The Gherkin", also uses the diagrid system.

British architect Ian Ritchie wrote in 2012:

The term iron frame describes the structural use of either cast iron or wrought iron in the columns and beams of a building. While popular in the 19th century, the iron frame was displaced by the steel frame in the early 20th century.

The Grand Palais des Champs-Élysées (French pronunciation: [ɡʁɑ̃ palɛ de ʃɑ̃z‿elize]; English: Great Palace of the Champs-Élysées), commonly known as the Grand Palais, is a historic site, exhibition hall and museum complex located in the 8th arrondissement of Paris between the Champs-Élysées and the Seine, France on Avenue Winston-Churchill. Construction of the Grand Palais began in 1897 following the demolition of the Palais de l'Industrie (Palace of Industry) to prepare for the Universal Exposition of 1900. That exposition also produced the adjacent Petit Palais and Pont Alexandre III.

The building was designed to be a large-scale venue for official artistic events. A pediment on the building refers to this function with an inscription that reads, "a monument dedicated by the Republic to the glory of French art." Designed according to Beaux-Arts tastes, the building features ornate stone facades, glass vaults and period innovations that included iron and light steel framing and reinforced concrete.