When cities examine the need for a new span, suspension bridges have various distinct advantages and drawbacks to consider. 1. Suspension bridges are generally inexpensive to build. Suspension bridges are generally economical to build since just a few components are required to construct the construction. Many simple designs can be built with materials available in most any town or village. 2. They can carry more load than other types of bridges because they do not require vertical posts to support the deck. 3. They can be opened up for vehicle traffic.
4. They can be used for land crossings where other types of bridges cannot go. 5. They are very mobile allowing them to be moved if necessary.
6. They can be dangerous if not constructed properly. The main disadvantage of suspension bridges is their weakness when loading is applied vertically. Vertical loads on the bridge cause the girders to bend, which can lead to collapse of the structure.
7. They are difficult to repair once collapsed. This type of bridge needs to be taken out of service until it is replaced.
8. They can be noisy due to wind swaying the bridge deck.
9. They require an area clear of trees for construction.
10. They must be kept clean of debris such as leaves or dirt that could fall into the suspension cables.
Another drawback of suspension bridges is the material employed in their construction, which is the cables. When it comes to sustaining the weight of weights, these cables have limitations. Although it can support a small amount of weight in terms of cars going through, too much weight might cause the cables to snap. If this happens then the bridge will fall down causing damage and possible death to those on it.
Furthermore, cable-stayed bridges are particularly susceptible to high winds. The vertical members that support the cables function as wind breaks, preventing the cables from being pulled over. However, if the wind is strong enough, it can still pull down the stayed portion of the bridge. This type of bridge requires special design considerations in order to be safe.
The last disadvantage of suspension bridges is their cost. They require more maintenance than other types of bridges and also use more materials. For example, a single cable of sufficient strength to support a bridge of this kind would be extremely large.
Finally, they are not suitable for all conditions. For example, they cannot cross deep rivers or streams because there is no way to attach the suspension bridge to the opposite shore.
A List of Suspension Bridge Disadvantages
Suspension bridges are generally inexpensive to construct since just a few materials are required. Only the anchors to hold the structure, the cables to support the deck, and the passage for walkers or vehicles are required. The rest is magic! The key is using strong materials in the right quantities to achieve the right balance of weight per unit length.
The average cost of a new bridge is about $1 million. Older structures can be found for less than $500,000. A suspension bridge tends to be cheaper than its predecessor because it uses more lightweight material. Newer bridges are usually made with steel girders instead of wood, which makes them stronger while still being lighter.
Conventional bridges are much more expensive to build. Here's how: First, you need an enormous amount of land. An average-sized one-lane bridge requires 10,000 square feet of space. A two-lane bridge requires 20,000 square feet. That's a lot of room! Second, you need a huge investment. An average-size conventional bridge costs $4 million to $6 million dollars. Third, they last only about 50 years before they need repair or replacement. Fourth, they cause traffic delays because they cross many roads and highways. Fifth, there are safety concerns because people may think the bridge is open when it isn't and try to cross it even though it's not safe yet.