Logon to the University of Florida truss building laboratory  http://www.ce.ufl.edu/activities/cdrom/civil/sample.html

Study the following pages on this website.

1. Stability and Simple Trusses
2. The Long and Short of it
3. Sample Trusses

Click on each bridge  below and review information available at the Library of Congress American Memories website.  Then answer the questions at the bottom of the page.

	The Wheeling Suspension Bridge-1849
	Delaware County Bridge No. 131
	Waterford Covered Bridge, Spanning Le Boeuf Creek, Waterford, Erie County, PA

Delaware County Bridge No. 131

1) What style of truss is used in this bridge?  Refer to the University of Florida, Civil Engineering website.  http://www.ce.ufl.edu/activities/trusslab/sample.html

Waterford Covered Bridge

2) Discuss the probable reasons for the designers use of criss crossed members in the construction of this bridge.

In the "search for" box type -- Wheeling Suspension Bridge

3) The Wheeling Suspension Bridge combines elements of what two major bridge styles in its design?

Turn to data page 5 and 6 and read. 

4) How did the bridge designers deal with expansion and contraction of the bridge cables caused by temperature change or loading of the bridge? 

5) No bridge of this span had ever  been built.  According to this historical document what gave the designers confidence that their bridge would work?