Bridge Trusses
1.Name at least 6 different types of bridge trusses:
Pratt, Parker, K-Truss, Warren, Howe, Camelback http://www.msnbc.com/rachel-maddow-show/common-types-truss-bridges 2. Name and describe the 3 most common types of bridge truss types:
Warren: The Warren Truss uses equilateral triangles to spread out the loads. The triangles reduce the forces to only compression and tension.
Pratt: A Pratt truss includes vertical members and diagonals that slope down to the center. The inner diagonals are under tension under balanced loading and vertical elements under compression.
Howe: includes vertical members and diagonals that slope up to the center. The diagonal members are in compression and the vertical web members are in tension
http://ojhsbridges.weebly.com/truss-bridges.html …show more content…
Web give the truss its strength and rigidity by transferring the stresses in the chords throughout the structure.
https://nationalvetcontent.edu.au/alfresco/d/d/workspace/SpacesStore/b2f0fcee-47cb-4650-b248-f533d73d5428/13_05/toolbox13_05/unit8_laying_up_roof_trusses/section1_principles/lesson2_parts_of_a_roof_truss.htm
4. What particular feature makes a truss so strong?
The feature that makes a truss so strong are the geometric principles that are used such as triangles. Triangle the strongest shape in existence. They are so strong because it is not possible to change the length of the member without changing the angle of the vertex and visa versa. This makes the triangle very resistant to changing its shape. http://makezine.com/2010/06/10/ask-make-how-do-trusses-work/ 5. How can one determine if a truss design is stable and its member forces can be calculated?
The member forces of a truss can be calculated if 2J=M+R where J is the number of joints, M is the number of members, and is the number of reaction forces. It will only be stable if this equation is true for the values of J, M, and R in a given truss follow the equation. If 2J is greaer or less than M+R, then the truss will be
Pratt, Parker, K-Truss, Warren, Howe, Camelback http://www.msnbc.com/rachel-maddow-show/common-types-truss-bridges 2. Name and describe the 3 most common types of bridge truss types:
Warren: The Warren Truss uses equilateral triangles to spread out the loads. The triangles reduce the forces to only compression and tension.
Pratt: A Pratt truss includes vertical members and diagonals that slope down to the center. The inner diagonals are under tension under balanced loading and vertical elements under compression.
Howe: includes vertical members and diagonals that slope up to the center. The diagonal members are in compression and the vertical web members are in tension
http://ojhsbridges.weebly.com/truss-bridges.html …show more content…
Web give the truss its strength and rigidity by transferring the stresses in the chords throughout the structure.
https://nationalvetcontent.edu.au/alfresco/d/d/workspace/SpacesStore/b2f0fcee-47cb-4650-b248-f533d73d5428/13_05/toolbox13_05/unit8_laying_up_roof_trusses/section1_principles/lesson2_parts_of_a_roof_truss.htm
4. What particular feature makes a truss so strong?
The feature that makes a truss so strong are the geometric principles that are used such as triangles. Triangle the strongest shape in existence. They are so strong because it is not possible to change the length of the member without changing the angle of the vertex and visa versa. This makes the triangle very resistant to changing its shape. http://makezine.com/2010/06/10/ask-make-how-do-trusses-work/ 5. How can one determine if a truss design is stable and its member forces can be calculated?
The member forces of a truss can be calculated if 2J=M+R where J is the number of joints, M is the number of members, and is the number of reaction forces. It will only be stable if this equation is true for the values of J, M, and R in a given truss follow the equation. If 2J is greaer or less than M+R, then the truss will be