30 Facts

30 Facts

1.      A truss is an arrangements of structural members that are connected together to form a rigid framework.

2.      Trusses have been used extensively in bridges since the early 19^th Century.

3.       There are many other types of bridges besides truss bridges which include beam bridges, arches, suspension bridges, and cable-stayed bridges.

4.      Dunlap’s Creek Bridge is one example of the many contributions made by West Point graduates to the infrastructure.

5.      Truss bridges are usually categorized in two different ways.

6.      The deck truss has its deck located at the chord.

7.      The deck is the floor of a bridge.

8.      It provides direct support for vehicles and pedestrians.

9.      Through truss has its deck located at the bottom chord.

10.  The pony truss looks just like the through expect it’s not as high.

11. Also the pony truss has no bracing between the top chords.

12.Truss configurations based on orientation of member.

13. One major part of a typical truss bridge is a chord top and bottom.

14. Loads are forces applied to a structure.

15. The yield stress is the strength of a metal

16. It is the force per unit areas at which the metal fails by yielding.

17. Yielding is one possible failure mode for a member of metal.

18. When a metallic material fails by yielding it undergoes very large deformations.

19. Structural Stability of a truss is stable if its entire member is arranged in a network of interconnected triangles.

20.  Minor adjustment can reduce the cost of a design significantly.

21.  A number of standard truss configurations are commonly used in bridge structures.

22. These configurations are defined primarily by the geometry of their members.

23. Three of the most common standard configuration is Howe, Patt, and Warren trusses.

24. These trusses are named after the 19^th century engineers who developed them.

25. Loads include the weight of a bridge and vehicles that are on them.

26. Loads can also include weather, such as snow.

27. These forces must all be considered when developing a bridge.

28. Yield stress is the strength of a metal.

29. The strength of a metal must be determined before building a bridge.

30. Supporting structures, such as beans and wires are used commonly in bridges.

Vocabulary

Vocabulary

1. Tension – is an internal axial member force that tends to lengthen a member.
2. Compression – is an internal axial member force that tends to shorter a member.
3. Through Truss – is a truss whose deck is located at or very near the bottom chord
4. Pony Truss – it looks just like the through truss but it is not as high and has no bracing between the top chords.
5.  Deck Truss – is a truss whose deck is located at or very near the top chord.
6.  Force -  push or pull
7. Load – forces applied to a structure.
8. Deck – is the floor of the bridge which provides support for the vehicles and pedestrians that cross the bridge.
9. Yield Stress – is the strength of a metal.
10. Span – is the length from support to support
11. Buckling - is the principal failure mode of a member that is loaded in compressed axially.