Manual Knex 79433 (page 8 of 16) (English, German, Dutch, Danish, French, Italian, Polish, Portuguese, Swedish, Turkish, Spanish, Norwegian, Finnish)

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Engineers often use the strength of triangles to create a

framework called a TRUSS. Trusses can be used to build long

spans and enhance strength without adding weight to the bridge,

as a thicker beam would do. The Truss Bridge was designed as

a latticework of triangles that helped to keep a structure from

bending, pulling, or twisting out of shape.

Based on what you just learned about the strength of triangles,

do you think a bridge with more triangles in the truss framework

will be stronger than one with less triangles? Let’s test it!

1. Start with the Warren Truss bridge. How many triangles are

in the Warren Truss framework? Find a way to test how much

weight it will hold. Use weights if you have them or even heavy

textbooks. Make sure to wear safety goggles! Record the

weight of the load after the bridge fails.

Now that you have built the Truss Bridge,

let’s explore your model!

Howe Truss

Baltimore Truss

Warren Truss

79433

Truss Bridge Activity

(

)

English

2. Rebuild your Warren Truss bridge into the Howe Truss bridge

and repeat step 1, recording your observations.

3. Rebuild your Howe Truss bridge into the Baltimore Truss

bridge and repeat step 1, recording your observations.

What did your observations tell you? Does increase the number

of triangles in a truss framework strengthen or weaken a bridge?

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Knex 79433 Manual

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