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Double Tee
A double tee or double-T beam is a load-bearing structure that resembles two T-beams connected to each other side by side. The strong bond of the flange (horizontal section) and the two webs (vertical members, also known as stems) creates a structure that is capable of withstanding high loads while having a long span. The typical sizes of double tees are up to for flange width, up to for web depth, and up to or more for span length. Double tees are pre-manufactured from prestressed concrete which allows construction time to be shortened. History The developments of double tee were started in the 1950s by two independent initiatives, one by Leap Associates founded by Harry Edwards in Florida, and the other by Prestressed Concrete of Colorado. They designed the wings to expand the structural channel in order to cover more area at a lower cost. In 1951, Harry Edwards and Paul Zia designed a wide prestressed double tee section. Non-prestressed double tees were constructed in Miami ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Texas Tech University
Texas Tech University (Texas Tech, Tech, or TTU) is a public research university in Lubbock, Texas. Established on , and called Texas Technological College until 1969, it is the main institution of the five-institution Texas Tech University System. The university's student enrollment is the sixth-largest in Texas as of the Fall 2020 semester. As of fall 2020, there were 40,322 students (33,269 undergraduate and 7,053 graduate) enrolled at Texas Tech. With over 25% of its undergraduate student population identifying as Hispanic, Texas Tech University is a designated Hispanic-serving institution (HSI). The university offers degrees in more than 150 courses of study through 13 colleges and hosts 60 research centers and institutes. Texas Tech University has awarded over 200,000 degrees since 1927, including over 40,000 graduate and professional degrees. Texas Tech is classified among "R1: Doctoral Universities – Very high research activity." Research projects in the areas o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Concrete Strength
Concrete is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens (cures) over time. Concrete is the second-most-used substance in the world after water, and is the most widely used building material. Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminum combined. Globally, the ready-mix concrete industry, the largest segment of the concrete market, is projected to exceed $600 billion in revenue by 2025. This widespread use results in a number of environmental impacts. Most notably, the production process for cement produces large volumes of greenhouse gas emissions, leading to net 8% of global emissions. Other environmental concerns include widespread illegal sand mining, impacts on the surrounding environment such as increased surface runoff or urban heat island effect, and potential public health implications from toxic ingredients. Significant research and development is b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caulking
Caulk or, less frequently, caulking is a material used to seal joints or seams against leakage in various structures and piping. The oldest form of caulk consisted of fibrous materials driven into the wedge-shaped seams between boards on wooden boats or ships. Cast iron sewerage pipe were formerly caulked in a similar way. Riveted seams in ships and boilers were formerly sealed by hammering the metal. Modern caulking compounds are flexible sealing compounds used to close up gaps in buildings and other structures against water, air, dust, insects, or as a component in firestopping. In the tunnelling industry, caulking is the sealing of joints in segmental precast concrete tunnels, commonly by using concrete. Historical uses Wooden shipbuilding Traditional caulking (also spelled calking) on wooden vessels uses fibers of cotton and oakum ( hemp) soaked in pine tar. These fibers are driven into the wedge-shaped seam between planks, with a caulking mallet and a broad chisel- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Differential Rotation
Differential rotation is seen when different parts of a rotating object move with different angular velocities (rates of rotation) at different latitudes and/or depths of the body and/or in time. This indicates that the object is not solid. In fluid objects, such as accretion disks, this leads to shearing. Galaxies and protostars usually show differential rotation; examples in the Solar System include the Sun, Jupiter and Saturn. Around the year 1610, Galileo Galilei observed sunspots and calculated the rotation of the Sun. In 1630, Christoph Scheiner reported that the Sun had different rotational periods at the poles and at the equator, in good agreement with modern values. The cause of differential rotation Stars and planets rotate in the first place because conservation of angular momentum turns random drifting of parts of the molecular cloud that they form from into rotating motion as they coalesce. Given this average rotation of the whole body, internal differential rot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geometric Terms Of Location
{{unreferenced, date=March 2014 Geometric terms of location describe directions or positions relative to the shape of an object. These terms are used in descriptions of engineering, physics, and other sciences, as well as ordinary day to day discourse. Though these terms by themselves may be somewhat ambiguous, they are usually used in a context in which their meaning is clear. For example, when referring to a drive shaft it is clear what is meant by axial or radial directions. Or, in a free body diagram, one may similarly infer a sense of orientation by the forces or other vectors represented. Examples Common geometric terms of location are: * Axial – along the center of a round body, or the axis of rotation of a body * Radial – along a direction pointing along a radius from the center of an object, or perpendicular to a curved path. * Circumferential (or azimuthal) – following around a curve or circumference of an object. For instance: the pattern of cells in Taylor–Coue ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bridge Deck
A deck is the surface of a bridge. A structural element of its superstructure, it may be constructed of concrete, steel, open grating, or wood. Sometimes the deck is covered by a railroad bed and track, asphalt concrete, or other form of pavement for ease of vehicle crossing. A concrete deck may be an integral part of the bridge structure (T-beam or double tee structure) or it may be supported with I-beams or steel girders. When a bridge deck is installed in a through truss, it is sometimes called a floor system. A suspended bridge deck will be suspended from the main structural elements on a suspension or arch bridge. On some bridges, such as a tied-arch or a cable-stayed, the deck is a primary structural element, carrying tension or compression to support the span. A deck bridge is one in which the deck itself is the main structural element, itself carrying the roadway. Contrast to a truss bridge which may carry a deck on the top chords or bottom chords of a structural ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pittsfield, Maine
Pittsfield is a town in Somerset County, Maine, United States. The population was 3,908 at the 2020 census. Pittsfield is home to the Maine Central Institute, a semi-private boarding school, and the annual Central Maine Egg Festival. History The area was part of the Kennebec Purchase. First called Plymouth Gore, it was settled in 1794 by Moses Martin and his family from Norridgewock. In 1815, the town was organized as the Plantation of Sebasticook, but was incorporated on June 18, 1819, as Warsaw after Warsaw, Poland. In 1824, the name was changed to Pittsfield after William Pitts of Boston Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- mo ..., a large landowner after Maine's independence as there was a Pittsfield, Massachusetts, Pittsfield incorporated already in Massachusetts. P ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canaan, Maine
Canaan is a town in Somerset County, Maine, United States. The population was 2,193 at the 2020 census. Geography According to the United States Census Bureau, the town has a total area of , of which, of it is land and is water. Demographics 2010 census As of the census of 2010, there were 2,275 people, 901 households, and 637 families living in the town. The population density was . There were 1,105 housing units at an average density of . The racial makeup of the town was 97.1% White, 0.1% African American, 0.8% Native American, 0.1% Asian, 0.3% Pacific Islander, 0.1% from other races, and 1.5% from two or more races. Hispanic or Latino of any race were 0.6% of the population. There were 901 households, of which 34.6% had children under the age of 18 living with them, 52.3% were married couples living together, 11.9% had a female householder with no husband present, 6.5% had a male householder with no wife present, and 29.3% were non-families. 21.8% of all households w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
York River (Maine)
The York River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed June 30, 2011 stream in southeast Maine, United States. It is tidal for over half of its length. It rises at York Pond in Eliot, and conjoined by brooks and creeks, feeds the tidal section. The York River flows southeast to the Atlantic Ocean at York Harbor in the town of York. The Abenaki name for the York River is ''Agamenticus'', which means "Beyond-the-hill-little-cove". According to Eben Norton Horsford, Agamenticus "described the site of the mouth of Little York River to one approaching it from the ''north'', as it lay behind the hill called by the Indians "Sassanows" (the modern Agamenticus). Little York River, a short tidal river, was the "Beyond-the-hill-little-cove." Legislation On May 23, 2013, Rep Chellie Pingree introduced the York River Wild and Scenic River Study Act of 2013 (H.R. 2197; 113th Congress) would have required the National ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maine State Route 103
State Route 103 (SR 103) is a long state highway in extreme southern Maine. The route is signed east–west, but forms a half-loop, with most of its western segment running strongly southeast slightly inland of the Piscataqua River and the state border with New Hampshire, its central skirting the Piscataqua generally easterly, and its eastern strongly northeast slightly inland from the Atlantic Ocean. The route piggybacks on different roads with many turns throughout its length. Route description SR 103 begins in the west at an intersection with SR 236 (which is itself a former alignment of SR 103 there) west of Eliot, near its intersection with SR 101 just southwest of the border between South Berwick and Dover, New Hampshire. For its first mile SR 103 heads south-southwest, until crosses Sturgeon Creek, a tidal inlet of the Piscataqua River, the state border with New Hampshire. There it turns southeast to parallel the river, meandering slightly inland southeast t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rapid Bridge Replacement
Rapid bridge replacement or accelerated bridge construction (ABC) is a technique that allows bridges to be replaced with minimum disruption to traffic. The replacement bridge is constructed on a site near the bridge to be replaced. When it is completed, the old bridge is cut away and removed using self-propelled modular transporters (SPMTs). Then the SPMTs lift the new bridge, transfer it to the work site and put it in place. Often the highway or railroad carried by the bridge is closed for just one weekend. Conventional techniques typically replace half a bridge at a time, with all highway traffic redirected under the other bridge half, often for a year or more, while construction progresses. Accelerated bridge construction (ABC) alternatives consist of ABC components and ABC techniques. Components can be categorized into prefabricated bridge elements (e.g. beams, bridge decks, footings, columns, pier caps, abutments etc.) or prefabricated bridge systems (e.g. bridge modules with s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northeastern United States
The Northeastern United States, also referred to as the Northeast, the East Coast, or the American Northeast, is a geographic region of the United States. It is located on the Atlantic coast of North America, with Canada to its north, the Southern United States to its south, and the Midwestern United States to its west. The Northeast is one of the four regions defined by the U.S. Census Bureau for the collection and analysis of statistics. The region is usually defined as including nine U.S. states: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, and Vermont. The U.S. Census Bureau–defined region of the Northeastern United States has a total area of with of that being land mass, making it the smallest region of the United States by both land mass and total area. The Northeastern region is the nation's most economically developed, densely populated, and culturally diverse region. Of the nation's four census regions, the No ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
