Vertical cables in a suspension bridge

In summary, the conversation discusses problem 5 from the first homework assignment in PHYS203, which can be found at the given link. The question focuses on adjusting cable lengths in order to eliminate shear stress on a bridge. The questioner is confused about the meaning of this and wonders if it means the cables are loose and have no tension. The responder clarifies that it means there are no horizontal forces on the bridge elements, and having mismatched cable lengths would cause this.
  • #1
OmegaKV
22
1

Homework Statement


Problem 5 here:

http://www.princeton.edu/~romalis/PHYS203/HW1.pdf

Homework Equations


N/A

The Attempt at a Solution



The part that really confuses me is where it says that the cable lengths are adjusted so there is no shear stress on the bridge. What exactly does this mean? Does that mean the cables are loose enough that there is no tension in the cables? If that's the case, then what difference do the cables make?
 
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  • #2
OmegaKV said:
Does that mean the cables are loose enough that there is no tension in the cables?
No, it means there are no horizontal forces on the bridge elements. If the cables would have lengths not matching the bridge structure you would get this.
 
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Related to Vertical cables in a suspension bridge

1. What is the purpose of vertical cables in a suspension bridge?

The vertical cables in a suspension bridge serve as the primary support system for the bridge deck. They help to distribute the weight of the deck and any vehicles or pedestrians crossing the bridge evenly across the main cables, which are anchored on either side of the bridge.

2. How are the vertical cables attached to the bridge deck?

The vertical cables are typically attached to the bridge deck using a series of smaller cables or rods known as hangers. These hangers are connected to the main cables and the deck through a series of anchor points, providing additional support and stability to the bridge deck.

3. How are the vertical cables able to support the weight of the bridge deck and traffic?

The vertical cables are made of strong, durable materials such as steel or high-strength synthetic fibers, and are designed to withstand the weight and stress of the bridge deck and any traffic crossing the bridge. The cables are also anchored securely to the ground on either side of the bridge, providing additional stability and support.

4. How many vertical cables are typically used in a suspension bridge?

The number of vertical cables used in a suspension bridge can vary depending on the size and design of the bridge. However, most suspension bridges have anywhere from dozens to hundreds of vertical cables, with larger bridges requiring more cables to support the weight of the deck and traffic.

5. Are the vertical cables the only support system for a suspension bridge?

No, the vertical cables are just one part of the support system for a suspension bridge. In addition to the cables, suspension bridges also have anchorages on either side of the bridge, which are large structures that secure the main cables to the ground. The bridge deck and hangers also play a crucial role in the overall support and stability of the bridge.

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