Best Bridge Type: Cable Stayed Bridge

In summary, the conversation discussed building a bridge for a class project with specific criteria such as length, weight, and testing method. The question was asked about the most efficient and easy to build bridge type, with suggestions for a cable-stayed bridge using straws, masking tape, and string. The criteria for the bridge was simply that it had to hold, and the use of a tied beam with cables below the deck was recommended. The conversation also mentioned considering failure modes and using anchor points for tension.
  • #1
nikirock021
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Homework Statement


In class we were asked to build a bridge with the length of 50 cm and the width of 20 cm, maximum weight is 50 g and the test is to place the bridge on two parallel chairs and then place a heavy object in the center. we can build any type of bridge. material: unknown. My question is that what would be the most efficient and easy to build bridge type that can cover all mentioned criteria?
if you have any advice on bridge making please share, it would be a great help. Thank you

2. relevant equations
the modulus equation?

3. attempt at solution
I was thinking of building a cable stayed bridge as it seems to be the lightest as per theory.
 
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  • #2
What are the rating criteria?
Two cables with a tiny bit of additional material for stiffness would hold a large weight easily - do you need some deck, and does it have to be horizontal?
 
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  • #3
mfb said:
What are the rating criteria?
Two cables with a tiny bit of additional material for stiffness would hold a large weight easily - do you need some deck, and does it have to be horizontal?
The criteria is simply that the bridge has to hold. The material has been updated straws, masking tape, and string
 
  • #4
A cable-stayed bridge would need to use the deck as a compression anchor, and it would be difficult to load. A better solution is to use a tied beam with the cables going below the deck. Cables still need to be anchored to the deck, but it's easier to load. You need to know the dimensions of the weights to be used, but a triangular or trapezoidal form is closest to the bending moment diagram and should be the most 'efficient' Think about how to modify this two-dimensional shape so thet it doesn't buckle out of plane. Perhaps you should list all the possible failure modes before you start.
 
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  • #5
Ah, good point. Do you get anchor points that can take tension from a string?
 
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  • #6
Think of winding the string around something that won't slip. There are hazards in all designs but you will best learn from the experience itself.
 
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1. What is a cable stayed bridge?

A cable stayed bridge is a type of bridge that has one or more towers and cables supporting the bridge deck. The cables run directly from the towers to the deck, forming a fan-like pattern. This design allows for longer spans and less material used, making it a popular choice for large bridges.

2. How do cable stayed bridges compare to other bridge types?

Cable stayed bridges are often compared to other bridge types such as suspension bridges and cantilever bridges. They have similar advantages in terms of longer spans and less material used, but cable stayed bridges have a distinct aesthetic appeal due to their unique cable and tower design.

3. What are the main components of a cable stayed bridge?

The main components of a cable stayed bridge include the deck, towers, cables, and anchorages. The deck is the roadway of the bridge, while the towers act as support structures. The cables, which are typically made of steel, provide additional support and transfer the weight of the bridge to the towers. The anchorages are the points where the cables are secured to the ground or other structures.

4. What are the benefits of using a cable stayed bridge?

One of the main benefits of using a cable stayed bridge is its aesthetic appeal. The unique design of the cables and towers can make for a visually striking bridge. Additionally, cable stayed bridges are often more cost-effective and faster to construct compared to other bridge types. They also have a longer lifespan and require less maintenance.

5. What are the potential drawbacks of using a cable stayed bridge?

One potential drawback of cable stayed bridges is their susceptibility to wind and vibrations. The cables can also be difficult to maintain and repair if damaged. Additionally, the initial cost of building a cable stayed bridge may be higher compared to other bridge types, which may make it less feasible for smaller scale projects.

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