Design choice

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In engineering, a design choice is a possible solution to a problem. Given a design task and a governing set of criteria (design specifications), several conceptual designs may be drafted. Each of these preliminary concepts is a potential design choice. Many never advance beyond the preliminary phase; those that are developed to the point at which they could be applied become the pool from which the final selection is made. This process stems from the principle that there is usually no uniquely right way of accomplishing any task. The final selection is often made on a financial basis; i.e., the least expensive design is chosen in a bid process.

In civil engineering, design choices typically derive from basic principles of materials science and structural design. A suspension bridge, for example, uses the fact that steel is extremely efficient in tension, while a prestressed concrete bridge takes advantage of concrete's relatively low cost by weight and its ability to sustain high compressive loading (see compression).

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The Rational Unified Process (RUP) is an iterative software development process framework created by the Rational Software Corporation, a division of IBM since 2003. RUP is not a single concrete prescriptive process, but rather an adaptable process framework, intended to be tailored by the development organizations and software project teams that will select the elements of the process that are appropriate for their needs. RUP is a specific implementation of the Unified Process.

<span class="mw-page-title-main">Usability</span> Capacity of a system for its users to perform tasks

Usability can be described as the capacity of a system to provide a condition for its users to perform the tasks safely, effectively, and efficiently while enjoying the experience. In software engineering, usability is the degree to which a software can be used by specified consumers to achieve quantified objectives with effectiveness, efficiency, and satisfaction in a quantified context of use.

<span class="mw-page-title-main">Hungerford Bridge and Golden Jubilee Bridges</span> Bridges in London

The Hungerford Bridge crosses the River Thames in London, and lies between Waterloo Bridge and Westminster Bridge. Owned by Network Rail Infrastructure Ltd it is a steel truss railway bridge flanked by two more recent, cable-stayed, pedestrian bridges that share the railway bridge's foundation piers, and which are named the Golden Jubilee Bridges.

<span class="mw-page-title-main">Gladesville Bridge</span> Bridge in Sydney, Australia

Gladesville Bridge is a heritage-listed concrete arch road bridge that carries Victoria Road over the Parramatta River, linking the Sydney suburbs of Huntleys Point and Drummoyne, in the local government areas of Canada Bay and Hunter's Hill, in New South Wales, Australia. Despite its name, the bridge is not in Gladesville.

<span class="mw-page-title-main">Millau Viaduct</span> 2004 bridge across Tarn near Millau, France

The Millau Viaduct is a multispan cable-stayed bridge completed in 2004 across the gorge valley of the Tarn near Millau in the Aveyron department in the Occitanie Region, in Southern France. The design team was led by engineer Michel Virlogeux and English architect Norman Foster. As of September 2020, it is the tallest bridge in the world, having a structural height of 336.4 metres (1,104 ft).

<span class="mw-page-title-main">Prestressed concrete</span> Form of concrete used in construction

Prestressed concrete is a form of concrete used in construction. It is substantially "prestressed" (compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service.

Prefabrication is the practice of assembling components of a structure in a factory or other manufacturing site, and transporting complete assemblies or sub-assemblies to the construction site where the structure is to be located. The term is used to distinguish this process from the more conventional construction practice of transporting the basic materials to the construction site where all assembly is carried out.

<span class="mw-page-title-main">Box girder bridge</span> Type of bridge

A box girder bridge, or box section bridge, is a bridge in which the main beams comprise girders in the shape of a hollow box. The box girder normally comprises prestressed concrete, structural steel, or a composite of steel and reinforced concrete. The box is typically rectangular or trapezoidal in cross-section. Box girder bridges are commonly used for highway flyovers and for modern elevated structures of light rail transport. Although the box girder bridge is normally a form of beam bridge, box girders may also be used on cable-stayed and other bridges.

<span class="mw-page-title-main">Eastern span replacement of the San Francisco–Oakland Bay Bridge</span> Seismic stabilization megaproject in California, United States (2002-2013)

The eastern span replacement of the San Francisco–Oakland Bay Bridge was a construction project to replace a seismically unsound portion of the Bay Bridge with a new self-anchored suspension bridge (SAS) and a pair of viaducts. The bridge is in the U.S. state of California and crosses the San Francisco Bay between Yerba Buena Island and Oakland. The span replacement took place between 2002 and 2013, and is the most expensive public works project in California history, with a final price tag of $6.5 billion, a 2,500% cost overrun from the original estimate of $250 million. Originally scheduled to open in 2007, several problems delayed the opening until September 2, 2013. With a width of 258.33 ft (78.74 m), comprising 10 general-purpose lanes, it is the world's widest bridge according to Guinness World Records.

<span class="mw-page-title-main">Girder</span> Support beam used in construction

A girder is a support beam used in construction. It is the main horizontal support of a structure which supports smaller beams. Girders often have an I-beam cross section composed of two load-bearing flanges separated by a stabilizing web, but may also have a box shape, Z shape, or other forms. Girders are commonly used to build bridges.

<span class="mw-page-title-main">Robert Maillart</span> Swiss civil engineer and bridge designer

Robert Maillart was a Swiss civil engineer who revolutionized the use of structural reinforced concrete with such designs as the three-hinged arch and the deck-stiffened arch for bridges, and the beamless floor slab and mushroom ceiling for industrial buildings. His Salginatobel (1929–1930) and Schwandbach (1933) bridges changed the aesthetics and engineering of bridge construction dramatically and influenced decades of architects and engineers after him. In 1991 the Salginatobel Bridge was declared an International Historic Civil Engineering Landmark by the American Society of Civil Engineers.

<span class="mw-page-title-main">Erasmusbrug</span> Bridge in Rotterdam, The Netherlands

The Erasmusbrug is a combined cable-stayed and bascule bridge, construction began in 1986 and was completed in 1996. It crosses the Nieuwe Maas in the centre of Rotterdam, connecting the north and south parts of this city, second largest in the Netherlands. The bridge was named in 1992 after Desiderius Erasmus, a prominent Christian Renaissance humanist also known as Erasmus of Rotterdam. The Erasmus Bridge is Rotterdam's most important landmark and is even part of the city's official logo.

The engineering design process is a common series of steps that engineers use in creating functional products and processes. The process is highly iterative - parts of the process often need to be repeated many times before another can be entered - though the part(s) that get iterated and the number of such cycles in any given project may vary.

<span class="mw-page-title-main">Services Selection Board</span>

Services Selection Board (SSB) is an organization that assesses the candidates for becoming officers into the Indian Armed Forces. The board evaluates the suitability of the candidate for becoming an officer using a standardized protocol of evaluation system which constitutes personality, intelligence tests, and interviews. The tests are of both types i.e. written and practical task-based. An SSB comprises the panel of assessors, who are officers in the Indian Armed Forces and having their specialization as Psychologist, GTO, and Interviewing Officer. At times the psychologist may not be directly from the armed forces as well. In total there are thirteen Service Selection Boards across India, out of which four boards are for the Indian Army, four boards are for Indian Air Force, and five boards for the Indian Navy. SSB is a 5 days evaluation process.

Systems psychology is a branch of both theoretical psychology and applied psychology that studies human behaviour and experience as complex systems. It is inspired by systems theory and systems thinking, and based on the theoretical work of Roger Barker, Gregory Bateson, Humberto Maturana and others. Groups and individuals are considered as systems in homeostasis. Alternative terms here are "systemic psychology", "systems behavior", and "systems-based psychology".

<span class="mw-page-title-main">History of structural engineering</span>

The history of structural engineering dates back to at least 2700 BC when the step pyramid for Pharaoh Djoser was built by Imhotep, the first architect in history known by name. Pyramids were the most common major structures built by ancient civilizations because it is a structural form which is inherently stable and can be almost infinitely scaled.

<span class="mw-page-title-main">T-beam</span> T-shaped construction module

A T-beam, used in construction, is a load-bearing structure of reinforced concrete, wood or metal, with a T-shaped cross section. The top of the T-shaped cross section serves as a flange or compression member in resisting compressive stresses. The web of the beam below the compression flange serves to resist shear stress. When used for highway bridges the beam incorporates reinforcing bars in the bottom of the beam to resist the tensile stresses which occur during bending.

James E. Roberts was a noted American civil engineer. He was recognized with industry and government awards for his leadership in bridge engineering, especially in the area of seismic retrofit. He was the state bridge engineer at Caltrans during the Loma Prieta earthquake and Northridge earthquake. His public service career lasted more than 50 years in the US Army, US Army Reserves and Caltrans. Roberts career spanned over 50 years and covered some of the most active years for engineering experienced in California from the design and construction heyday of the 1950s and 1960s to his leadership during the reconstruction efforts and seismic retrofitting programs created after two significant California earthquakes the 1989 Loma Prieta earthquake and the 1994 Northridge earthquake.

Geoprofessions is a term coined by the Geoprofessional Business Association to connote various technical disciplines that involve engineering, earth and environmental services applied to below-ground (“subsurface”), ground-surface, and ground-surface-connected conditions, structures, or formations. The principal disciplines include, as major categories:

The Sagadahoc Bridge is a four-lane concrete segmental box girder bridge between the City of Bath and the town of Woolwich, Maine, carrying U.S. Route 1 (US 1) over the Kennebec River. It was completed in 2000 to replace the two-lane road portion of the adjoining 1927 Carlton Bridge, which remains in use as a rail bridge. It is 2,972-foot-long (906 m) and features the longest precast concrete segmental span in North America at 420 feet (130 m). It is also notable for being the first design/build project undertaken by the Maine Department of Transportation. The bridge cost $46.6 million, and is the last downstream road crossing of the Kennebec.