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Topic: Beam bridge

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	Bridge (structure) - MSN Encarta
		The basic beam bridge, a simple beam over a span, was strengthened by adding support piers underneath and by reinforcing the structure with elaborate scaffolding called a truss.
		Beam bridges typically span the shortest distances, while suspension and cable-stayed bridges span the greatest distances.
		A beam bridge consists of a rigid horizontal member called a beam that is supported at both ends, either by a natural land structure, such as the banks of a river, or by vertical posts called piers.
	encarta.msn.com /encyclopedia_761561057/Bridge_(structure).html (867 words)

	Research \| Performance of Timber Beam Bridges in Tasmania (Site not responding. Last check: 2007-11-04)
		Bridge inspection relies heavily on visual cue such as fruiting bodies or stains associated with wood decay, or distortions to the form of beams indicating internal collapse often associated with advanced decay.
		The beams from the bridge are recovered at demolition and transported to the University of Tasmania laboratories.
		The "ductility" of the beams seen in the load deflection plots in Figure 3 is a characteristic of natural round hardwood with large deformation occurring at essentially constant load.
	oak.arch.utas.edu.au /research/beam.html (1642 words)

	Bridges By Type: Beam Bridges
		This beam bridge, having had its railings replaced, was mainly noted for a highly unusual concrete pier.
		This bridge is an excellent example of a lattice guardrail beam bridge in Ontario.
		This bridge is an example of a standard plan beam bridge in Pennsylvania with attractive metal railings.
	www.historicbridges.org /b_t_beam.htm (620 words)

	Concrete Beam Bridge - Background, History, Construction Materials, Design, The Manufacturing, Quality Control
		A simple beam bridge is generally used to span a distance of 250 ft (76.2 m) or less.
		Second, the superstructure of the bridge is the horizontal platform that spans the space between columns.
		A concrete beam is prestressed by pulling on steel rods running through the beam and then anchoring the ends of the rods to the ends of the beam.
	www.madehow.com /Volume-4/Concrete-Beam-Bridge.html (2161 words)

	Beam Bridges
		A beam or "girder" bridge is the simplest kind of bridge.
		In its most basic form, a beam bridge consists of a horizontal beam that is supported at each end by piers.
		The first beam is a box section, the second an I section beam and the third an L section beam.
	www.design-technology.org /beambridges.htm (580 words)

	Engineering is COOL - Gluep
		Also, beam bridges are no larger than 250 feet since the longer the length of the bridge, the weaker the vertical supports become which can lead to the collapse of the bridge.
		A variation of the beam bridge is the truss bridge, which uses rigid triangles to spread out the compression and tension forces.
		Truss bridges are longer than simple beam bridges; however, they are still restricted in how long they can be since the longer the bridge the bigger and heavier the trusses are too.
	www.engr.utexas.edu /wep/COOL/AcidRiver/allaboutbridges_Types.htm (400 words)

	Bridges - Different Types of Bridges (Site not responding. Last check: 2007-11-04)
		The weight does not push straight down on the bridge but it is carried outward along the curve of the arch to the supports at each end which are known as abutments.
		A beam bridge is a good design to use to span short distances that are not more than 250 feet because the farther apart the piers, the weaker the bridge becomes.
		A truss bridge is like a beam bridge except it has triangular shape patterns known as trusses which make the bridge stronger.
	www32.brinkster.com /redjeep/bridges/types.htm (586 words)

	Beams - theory and practice
		The bodies of many animals can be considered as beams between the legs, and their necks can be considered as cantilevers, though of course the internal structure is vastly more complicated than anything made by people Look at a giraffe, for example.
		At the centre of the beam, the cross section is at 45 degrees to the horizontal.
		To make a beam more stiff, instead of merely using more material to deepen a beam, it is better to split the existing material into several parallel beams which are deep but narrow; this is a better use of the material.
	www.brantacan.co.uk /beam.htm (3541 words)

	Bridge Engineers: Beam Bridges (Site not responding. Last check: 2007-11-04)
		Beam bridges can be further divided into simple beams, continuous beams, cantilever beams, and frame bridges.
		The weight of the objects moving overtop of the bridge that can be supported depends on both the strength of the beam used to connect the supports and the distance between the supports.
		This is a series of simple beam bridges which share supports, allowing the bridge to span long distances.
	members.shaw.ca /bridgek12/help/beam_bridge.htm (232 words)

	Beams - continued
		When these two beams were lowered to the horizontal position, they reduced the sag in the first beam, and themselves ended up with a lesser sag than if they had been separate.
		This beam bridge spans the M11 motorway and a joining road, in two almost equal spans (one incompletely shown) with a central support.
		The contours of the colours suggest that the forces are not parallel to the axes of the beam, which is indeed the case.
	www.brantacan.co.uk /beamb.htm (3127 words)

	Beam bridge - Wikipedia, the free encyclopedia
		A beam bridge is a rigid, horizontal structure that is resting on two piers, one on each end.
		It is a direct descendant of the log bridge now made from shallow steel "I" beams, box beams (hollow rectangular tubes), reinforced concrete, or post-tensioned concrete (concrete with tubes for cable tendons).
		As is its ancestor, this bridge is in structural terms the simplest of the many bridge types.
	en.wikipedia.org /wiki/Beam_bridge (227 words)

	Evolution of Trusses
		Bridges could be built more cheaply and rapidly from the new materials, which was the most important factor in their use.
		The duty of the bridge is to transfer the load F to the supports at the end of the span.
		The bridge was sheathed with shingles to protect it from the weather, forming the traditional "covered bridge." They were very unsatisfactory as a railway bridge, because they could not be rationally proportioned for the new heavy loads, connections worked loose, and other reasons.
	www.du.edu /~jcalvert/tech/truss.htm (3418 words)

	NDEVC Research & Development - Bridge Inspection Tasks
		The bridge deck is a 229-mm (9-in.) thick cast-in-place reinforced concrete slab and a 64-mm (2 ½-in.) concrete wearing surface with an additional 25-mm (1-in.) thick asphalt overlay.
		The bridge abutments are constructed integrally with the deck while the wing walls are isolated from the abutments by a 25-mm (1-in.) cork filled joint.
		Bridge B544 is skewed at approximately 25-degrees and has a 229-mm (9-in.) thick cast-in-place reinforced concrete slab with a 152-mm (6-in.) asphalt overlay.
	www.tfhrc.gov /hnr20/nde/bridge.htm (1009 words)

	Bridge types - beam structure bridges - beam, cantilever, draw, truss (Site not responding. Last check: 2007-11-04)
		A beam bridge is made with large supports on the edges and a heavy beam crossing over water, a ditch, or other open space.
		This beam bridge is located over the Pleasant Spring Creek in Perkasie, PA (next to the Dairy Queen).
		The cantilever bridge is a bridge formed by two projecting beams or trusses that are joined in the center by a connecting member and are supported on piers that are anchored by balancing members.
	www.pennridge.org /works/brbeam.html (341 words)

	Beam Type of Bridge @ Bridges 101 (Site not responding. Last check: 2007-11-04)
		Beam bridges are also made of steel, or a mixture of steel and concrete.
		Modern steel beam bridges are usually made section-by-section and then they are transferred to the site of the bridge and welded together.
		The beam will most likely be sagging, so the next beam must be fitted in place to eliminate the sagging before being welded.
	library.thinkquest.org /J002223/types/beam.html (311 words)

	01.05.02: Bridging the Math Gap
		My unit of the Bridge Seminar is the relationship between what is taught in math on the middle grade level, and the possibilities of the applications.
		Bridges are based on one or more of three basic structures that are derived from forms found in nature: beam from a log fallen across a stream, the arch from natural rock formations, and suspension from vines.1 Underneath all concrete and steel that bridges are made of today, the same basic ideas still apply.
		In a bridge stress is also caused by the pull of gravity; the amount of stress is determined by the weight of the bridge plus its load.
	www.yale.edu /ynhti/curriculum/units/2001/5/01.05.02.x.html (5283 words)

	Howstuffworks "How Bridges Work"
		Bridges are truly ubiquitous -- a natural part of everyday life.
		A bridge provides passage over some sort of obstacle: a river, a valley, a road, a set of railroad tracks...
		This is a major factor in determining what type of bridge to use, and by the time you are done reading this article you will understand why.
	science.howstuffworks.com /bridge.htm (263 words)

	پل ها و انواع پل ها و تكنولوژي بكارفته در پلها 1
		A beam bridge is basically a rigid horizontal structure that is resting on two piers, one at each end.
		This tension causes the lower portion of the beam to lengthen.
		Many beam bridges that you find on highway overpasses use concrete or steel beams to handle the load.
	mrafiee.5u.com /Technical/Bridge/Bridge-en1.html (532 words)

	Welcome to the Homepage of
		Arch bridges are one of the oldest types of bridges and have great natural strength.
		A beam or "girder" bridge is the simplest and most inexpensive kind of bridge.
		In cable-stayed bridges, the cables are attached to the towers, which alone bear the load.
	www.ce.jhu.edu /eozkan/Bridge_Basics.htm (312 words)

	Bridge - Wikipedia, the free encyclopedia
		For example, it may be a bridge carrying a highway and forbidden for pedestrians and bicycles, or a pedestrian bridge, possibly also for bicycles.
		An aqueduct is a bridge that carries water, resembling a viaduct, which is a bridge that connects points of equal height.
		Bridges may be classified by how the four forces of tension, compression, bending and shear are distributed through their structure.
	en.wikipedia.org /wiki/Bridge (1174 words)

	Information on types of bridges - The Beam Bridge.The Barking & Dagenham Bridges Project.
		The beam is one of the simplest forms of bridge.
		The beam has to be able to resist the bending which will happen with the biggest load that the designer wants it to take.
		There are simple examples of stone beam bridges which have survived for a long time.
	www.bardaglea.org.uk /bridges/bridge-types/bridge-types-beam.html (123 words)

	ExNET: Exhibits: Group 4: Beam Bridge
		At Beam Bridge, visitors experience how the thickness of a beam relates to its stiffness by comparing walks across a beam on its edge and the same beam on its side.
		Walking on the beam both compresses and stretches the beam: there is compression in the fibers along the top of the beam and tension in the fibers along the bottom.
		The beam, on its side, has just the opposite qualities: it has half the fibers resisting the forces that cause it to sag, while twice the material to resists sideways bending.
	www.exploratorium.edu /cmp/exnet/exhibits/group4/beam/index.html (131 words)

	Beam Bridges (Site not responding. Last check: 2007-11-04)
		A beam bridge is flat across and supported at the ends.
		A longer beam bridge may also be held up along the middle by piers that stand in the river.
		The weight of the bridge itself, plus any load it carries, are the downward forces acting on the beam bridge.
	www.rockport.k12.ma.us /rms/oconnorbridges/beam.html (118 words)

	Terminology - Bridge (Site not responding. Last check: 2007-11-04)
		A type of girder bridge in which the piers and deck girder are fastened to form a single unit.
		Unlike typical girder bridges which are constructed so that the deck rests on bearings atop the piers, a rigid frame bridge acts as a unit.
		Although described as a single structure, the Ohio Connecting RR bridge over the Ohio River at Brunot Island could be described as a pair of bridges (one over each river channel) with a trestle at each approach and a trestle connection in the center.
	www.pghbridges.com /termsBrg.htm (2779 words)

	BEAM (Site not responding. Last check: 2007-11-04)
		A simple beam bridge is flat across and supported at the two ends.
		The weight of the bridge, plus any load it carries, plus gravity, are the downward forces acting on the beam bridge.
		The beam bridge attempts to spread these downward forces evenly across the length of the bridge.
	cl.k12.md.us /bridges/bridgebm.HTM (114 words)

	The Science Enrichment Program
		Any time you have placed a log across a creek, or have created a balance beam by placing a long piece of wood on two bricks, you have created a beam bridge.
		Beam bridges are also common for highways going over other highways or over small creeks.
		So, a truss bridge is really just a beam bridge that has been made way more rigid by the addition of more layers and possibly strengthened even more with triangles.
	education.nacse.org /Curriculum/physical_bridge.html (979 words)

	Beam Bridge
		At Beam Bridge, visitors experience how the thickness of a beam relates to its stiffness by cwalking across a beam laid on its edge and on the same beam laid flat.
		Walking on the beam both compresses and stretches the beam: there is compression in the wood fibers along the top of the beam and tension in the fibers along the bottom.
		Lying flat, the beam has just the opposite qualities: it has half the fibers resisting the forces that cause it to sag, and twice the resistance to sideways bending.
	www.exploratorium.edu /cmp/exhibits/b/beam_bridge.html (132 words)

	U.S. Bridge - Beam Bridges
		U.S. Beam Bridges can take advantage of the benefits and features of galvanized, weathering, or painted steel, as each option is available.
		Accomodating span lengths up to 60-feet with a minimal dead load that allows existing substructures to be utilized, the U.S. Beam Bridge provides the right answer to your shorter-span bridge requirements.
		U.S. Bridge has the necessary equipment, materials and expertise to fabricate the most complex rolled beam bridge projects.
	www.usbridge.com /bridges/beam.asp (194 words)

	Knight Street Bridge Historic Beam Bridge in Eaton Rapids in Eaton County Michigan over Grand River
		Eaton Rapids is one of those towns that has taken care of most of its bridges and today has a number of historic bridges in town and these bridge are also in good condition.
		This bridge is perhaps not the most significant of the old bridges in Eaton Rapids, but is still a nice looking bridge.
		It as the standard railings that were seen on bridges built from the late 1930s through the early 1960s, however these having the uncommon variation of having steel railing posts rather than concrete posts which are more common.
	www.historicbridges.org /beam/knight/index.htm (213 words)

	Bridge Building Using Toothpicks .........
		A truss bridge is one where the deck is supported by a network of triangles (the strongest polygons because their shapes cannot be distorted) made from girders; a truss bridge can support heavy loads with a relatively small weight.
		In an arch bridge, compression pushes the weight away from the arch and against the side walls and the material of the arch itself.
		The cablestay bridge is the most interesting design; the deck is supported by cables from a central tower.
	www.worsleyschool.net /science/files/bridge/bridge1.html (221 words)

	Bridges: Toad Hollow Road Decorative Pony Truss-Lookin' Beam Bridge Over Oswayo Creek, Near Oswayo, Potter County, ...
		A closer inspection revealed that the little Toad Hollow Bridge is actually a steel beam bridge.
		Altered pony trusses have been mounted on the steel beams to act as sides for the bridge.
		Here is one of the spots where the old iron truss is connected to the underlying steel beam bridge.
	www.venangoil.com /bridgestoadhollow.html (299 words)

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