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# Truss Bridge

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by

## Linda Liu

on 7 March 2015

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#### Transcript of Truss Bridge

Truss Bridges
design by Dóri Sirály for Prezi
A truss bridge is a bridge composed of a truss, a structure of connected elements forming triangular units to support a roof. The connected elements (typically straight) may be stressed from tension, compression, or sometimes both in response to dynamic loads.
What is a truss bridge?
Deconstruction Part 1
Common types of truss bridge
Williamsburg Bridge in NYC
Our bridge is a warren bridge.

Types of forces that impact bridges:
By: Linda Liu, Fariha Shova, Ganesh Jainarain, and Zeon Fujiki
We present to you our warren truss bridge.
Our bridge is composed of geometric figures:
-4 triangles
-A pair of parallel lines (base of bridge) to support the structure
-Square (roof of bridge)
-'X's put together forming triangles
Our Bridge
Pros:
57/60 popsicle sticks used
Length- 8.75 inches
Includes features of an actual bridge (Torsion-allows wind to pass through)
Cons:
Collapsed at 20 pounds
No support inside of bridge
Tension
Compression
Opposite of tension. It is the appliances of pushing forces to different points of material or structure to maintain balance.
Torsion

-Wind plays a role in the twisting motion of a bridge. If a bridge does not have space for the wind to pass through, the force of the wind will cause the bridge to collapse.
Shear
Stress shear occurs when pressure is applied on opposite directions of a structure.
Ex: Driving a stick into the ground and applying force on the side of the stick that is above ground. With sufficient pressure, you will be able to break the stick.
Gravity
Gravity is the ability for the bridge to withstand its own weight and the pressure of gravity
When you are pulling something apart, and thus stretching it longer.
The action of twisting or the state of being twisted.
Process of building the bridge.
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Held 31 pounds
20 pounds :(
What we learned...
Deconstruction
Part 2
Truss is a formation produced by triangular components
A truss bridge is based around different tensions in metal pulling together when weight is applied to the bridge.
Elements that act primarily in the construction of the bridge are tension and compression
(Just trying it out)
Flaws of our bridge
Truss work (how our bridge is put together)
No support from the inside of the bridge.
Deconstructed it multiple times causing sticks to break, and uneven surfaces.
Why we chose
our method
Triangles are used to make a very strong form called a truss. When pressure is force upon a triangle it will resist, but when pressure is force upon a square it will collapse. Because equilateral triangles are formed with three equal side, pressure will be evenly distributed to each side.
Not only does it withhold its own weight, but external forces as well. Less materials are used to make this shape therefore it is more efficient.

Blueprint
Verbal explanation
of
previous projects...
City planning and straw towers
Full transcript