|
|
The vibrations from an earthquake are transmitted into the structure of the building. The way the building behaves depends on the "natural" frequency of the structure. For example, in some cases the building will sway in sync with the vibrations. When this occurs, each oscillation of the structure builds on the one before causing the amount the building deflects to increase. In other cases, the sway of the building is not in sync with the vibrations of the ground. In such cases, consecutive movements of the ground may actually decrease the amount the building moves. Since a building's height and structural characteristics dictate its natural frequency, it is possible for tall buildings to fair better than short buildings during an earthquake. A simple device can be built to demonstrate this concept. Use a 14" long 2"x4" as a base. Cut four lengths of 1/4" wood dowel, each having a different length.
|
