Transcript The Short Bridge

Introduction
I liked working on this bridge project and doing so has helped me a lot. I am
involved in this project because I do my work and am responsible. I am interested
in this project because I am good at math and working with bridges has a lot of
geometry in it. I also enjoy going into the computer lab after I get my math done
and working on my PowerPoint presentation. I think this was a great experience.
The Short Bridge
http://www.oregon.com/covered_bridges/bridges/short.cfm
The Short Bridge was built in 1945. It is located in Cascadia State Park and it
spans the South Santiam River on High Deck Road. The Short Bridge is also
notable for its wooden shingle roof. Previously known as the Whiskey Butte
Bridge, it was renamed for a long-time area resident, Gordon Short. It uses the
Howe Truss.
Howe Truss
The Howe Truss is one in a variety of trusses.
Other trusses include the warren truss, the Pratt
Truss, and the K Truss.
The relatively rare Howe truss
includes vertical and diagonal posts
that slope up towards the center,
which is the opposite of the Pratt
truss.
http://www.past-inc.org/historic-bridges/image-howetruss.html
The Use of Triangles and Bridges
Triangles are an important use in bridge structures and are the most
popular shape you see on a bridge. Why triangles are so strong is
because they have tension and compression. Compression is caused
by two ends being pushed together. Tension is caused by two ends
being pulled away from each other. Tension is stronger than
compression. Bridges have tension so they are stronger than ones
with other shapes.
Red represents tension, blue represents compression, and green is no load.
http://www.garrettsbridges.com/design/trussdesign/
The Short Bridge
(continued)
The Short Bridge is in Linn County, OR at 44˚23’29.6”N latitude, 122˚30’33.5”W
longitude. It is 105 ft in length and is the Howe Truss Type.
Directions: From Interstate 5 at Albany exit US Route 20 (exit 233) southeast
through Lebanon and Sweet Home for 37 miles to Cascadia. West of the
city limits of Cascadia, turn left at High Deck Road. Alternately, exit
Interstate 5 at exit 216 and travel east through Crawfordsville to Sweet
Home. Turn right on Highway 20 and continue to High Deck Road.
http://www.oregon.com/covered_bridges/bridges/short.cfm
www.mapquest.com
The End
http://www.ohiobarns.com/covbri/or/37-22-09.html