Stage Lighting And Effects Equipment

How are the concepts of triangle congruency and segments in a triangle used in making a truss bridge?

The geometric principle of the rigidity of a triangle relies on the fact that it is not possible to change the angle of a vertex without changing the length of a side, and it is not possible to change the length of a side without changing the angle of a vertex.

Thus a row of interlocking triangles is rigid for its size and weight because it resists having its shape changed. Truss bridges are constructed so that the floor beams that support the load are attached at the vertices of the triangles and use the rigidity of the frame to stay in alignment.

These may help:

http://mysite.du.edu/~jcalvert/tech/machines/bridges.htm

http://en.wikipedia.org/wiki/Trusses

http://en.wikipedia.org/wiki/Truss_bridges

http://www.mrdbridges.com/engineering.php

http://www.prhs.k12.ny.us/fac/HerskowitzM/bridges.htm

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