What are the disadvantages of a cable-stayed bridge?

List of the Cons of a Cable Stayed Bridge

• It can be an unstable design in certain environments.
• It has a maximum length.
• It can be a bridge design that is difficult to inspect.
• It can be susceptible to corrosion.
• It is only advantageous for short or medium distance needs.

What is sag in bridge?

Sag controls the length and stability of the suspension bridge, and is generally taken between 1/8 and 1/12 (a generally accepted optimum is a 1/10). If the main cables have a flat curve or a low sag ratio, the bridge has more vertical stability but the cable stress is high and strong anchorages are required.

What force causes bridge cables to sag?

Sagging involves compression and tension acting together. The top layer of the beam is squeezed, so it is under compression. The bottom layer is stretched, so it is under tension. If the weight on the beam increases, both the compression and tension increase.

What are 2 characteristics of a cable-stayed bridge?

A cable-stayed bridge has one or more towers (or pylons), from which cables support the bridge deck. A distinctive feature are the cables or stays, which run directly from the tower to the deck, normally forming a fan-like pattern or a series of parallel lines.

What is the world longest cable-stayed bridge?

The Sutong Bridge
1. The Sutong Bridge arcs across a 6-kilometer-wide stretch of the mighty Yangtze River 50 miles upstream from Shanghai. Measuring 8.2 km overall, its main span is the current world record-holder for a cable-stayed bridge.

What makes a cable-stayed bridge strong?

In the cable-stayed bridge, the cables deliver all of the weight of the bridge to the towers, and therefore, the bridge doesn’t need to be anchored to the shores. The cable-stayed design uses less steel cable than a suspension bridge, and is faster and easier to build.

What is cable sag?

Cable sag (h) is value of cable form equation for point l/2 (formula 12), where l is the straightline distance between the position transducer and the application (Figure 1). The length of the cable is the catenary length from point -l/2 to point l/2 (formula 14).

How are cable stayed bridges known to fail?

The dominant failure modes of the suspension bridge are the fracture of suspenders followed by the bending failure of girders. The degradation of suspenders due to fatigue-corrosion damage has a significant effect on the system reliability of a suspension bridge.

How long can a cable-stayed bridge be?

Cable-stayed bridges have the second-longest spanning capacity (after suspension bridges), and they are practically suitable for spans up to around 1000 m.