Understanding External Forces on Structures

The video tutorial explains external forces acting on structures, focusing on static and dynamic loads. Static loads, like gravity, do not change, while dynamic loads, such as wind and moving vehicles, vary in impact. The tutorial uses a bridge to illustrate these concepts, showing how gravity acts as a static load and how wind and a moving truck serve as dynamic loads. The video encourages viewers to identify external forces in their surroundings.

What are external forces?

• Forces that do not affect a structure

• Forces that only act on moving structures

• Forces that act within a structure

• Forces that act on a structure from the outside

Which of the following is a characteristic of a static load?

• It only acts on moving structures

• It remains constant and does not move

• It is unpredictable

• It moves or changes

What is an example of a static load on a bridge?

• Wind

• Vibrations

• A moving truck

• Gravity

Why is wind considered a dynamic load?

• Because it is a weak force

• Because it only acts on bridges

• Because it moves and changes direction

• Because it is a constant force

How does a moving truck act as a dynamic load on a bridge?

• It changes the point of force application as it moves

• It does not affect the bridge

• It remains stationary

• It only affects the bridge when it stops