The design principle behind the Burr arch truss is that the arch should be capable of bearing the entire load on the bridge while the truss keeps the bridge rigid. Even though the kingpost truss alone is capable of bearing a load, this was done because it is impossible to evenly balance a dynamic load crossing the bridge between the two parts.[5] The opposite view is also held, based on computer models, that the truss performs the majority of the load bearing and the arch provides the stability.[1] Either way, the combination of the arch and the truss provides a more stable bridge capable of supporting greater weight than either the arch or truss alone.
The U.S. state of Indiana has a large collection of Burr Truss bridges. Of its 92 extant bridges, 53 are Burr Trusses, many of which reside in Parke County.
Sim Smith Covered Bridge, Parke County, Indiana. Notice the arch projects below the lower chords of the bridge.
Mansfield Covered Bridge, Parke County, Indiana. The roof was missing after a major storm and the interior design was easier to see.
Mansfield Covered Bridge. Spans could be added to extend the bridge further than bridges of similar design.
Medora Covered Bridge, Jackson County, Indiana. This is the longest covered bridge in Indiana.
Design specificationedit
Deer Mills Covered Bridge, Montgomery County, Indiana
Referencesedit
^ ab. Truss Styles of Covered Bridges. New York State Covered Bridge Society. January 2006. Archived from the original on September 8, 2006. Retrieved September 15, 2006.
^. Covered Bridge Truss Types. Ohio Department of Transportation Office of Structural Engineering. Archived from the original on September 4, 2006. Retrieved September 15, 2006.
^"Truss Types". The Theodore Burr Covered Bridge Society of PA, Inc. Retrieved July 28, 2006.
^Calvert, J. B. (October 23, 2000). . Archived from the original on August 3, 2006. Retrieved July 28, 2006.
External linksedit
Cummings, Hubertis M. "Theodore Burr and his bridges across the Susquehanna". Retrieved July 28, 2006.
burr, truss, burr, arch, truss, simply, burr, arch, combination, arch, multiple, kingpost, truss, design, invented, 1804, theodore, burr, patented, april, 1817, used, bridges, usually, covered, bridges, burr, bridgeinterior, structure, covered, bridge, utilizi. The Burr Arch Truss or simply Burr Truss or Burr Arch is a combination of an arch and a multiple kingpost truss design It was invented in 1804 by Theodore Burr 1 patented on April 3 1817 2 and used in bridges usually covered bridges 3 4 Burr bridgeInterior structure of a covered bridge utilizing a kingpost with a Burr Arch structureAncestorTruss bridge kingpost bridgeRelatedNoneDescendantNoneCarriesPedestrians livestock vehiclesSpan rangeShort to mediumMaterialWood planksMovableNoDesign effortmedium Contents 1 Design 2 Gallery 3 Design specification 4 References 5 External linksDesign editThe design principle behind the Burr arch truss is that the arch should be capable of bearing the entire load on the bridge while the truss keeps the bridge rigid Even though the kingpost truss alone is capable of bearing a load this was done because it is impossible to evenly balance a dynamic load crossing the bridge between the two parts 5 The opposite view is also held based on computer models that the truss performs the majority of the load bearing and the arch provides the stability 1 Either way the combination of the arch and the truss provides a more stable bridge capable of supporting greater weight than either the arch or truss alone nbsp Example of a Burr Truss Baumgardener s Covered Bridge in Lancaster County Pennsylvania U S Gallery editThe U S state of Indiana has a large collection of Burr Truss bridges Of its 92 extant bridges 53 are Burr Trusses many of which reside in Parke County nbsp Sim Smith Covered Bridge Parke County Indiana Notice the arch projects below the lower chords of the bridge nbsp Mansfield Covered Bridge Parke County Indiana The roof was missing after a major storm and the interior design was easier to see nbsp Mansfield Covered Bridge Spans could be added to extend the bridge further than bridges of similar design nbsp Medora Covered Bridge Jackson County Indiana This is the longest covered bridge in Indiana Design specification edit nbsp Deer Mills Covered Bridge Montgomery County IndianaReferences edit a b The Burr Truss Truss Styles of Covered Bridges New York State Covered Bridge Society January 2006 Archived from the original on September 8 2006 Retrieved September 15 2006 Publication Number X0002769 Publication Images United States Patent and Trademark Office Retrieved September 15 2006 Truss Types Covered Bridge Truss Types Ohio Department of Transportation Office of Structural Engineering Archived from the original on September 4 2006 Retrieved September 15 2006 Truss Types The Theodore Burr Covered Bridge Society of PA Inc Retrieved July 28 2006 Calvert J B October 23 2000 The Burr Truss Archived from the original on August 3 2006 Retrieved July 28 2006 External links editCummings Hubertis M Theodore Burr and his bridges across the Susquehanna Retrieved July 28 2006 Historic American Engineering Record HAER No OH 138 Strength of Burr Arch Trusses 108 data pages Retrieved from https en wikipedia org w index php title Burr Truss amp oldid 1216098404, wikipedia, wiki, book, books, library,
