Download How Do Natural Phenomena Affect Structures

FORCES AFFECT STRUCTURES
Tornadoes and earthquakes are natural phenomena that also exert
force (e.g., push and pull) on structures
The force of these phenomena damage all kinds of structures from
homes to buildings and trees
TORNADOES
They are destructive because their winds can reach hundreds of
kilometers per hour
The higher the wind speed, the more force is exerted on structures
These winds apply force all around the structure, which is like putting
many loads onto different parts of the structure all at once
EARTHQUAKES
A sudden and violent shaking of the ground as a result of
movements within the earth's crust or volcanic action.
When earthquake shaking occurs, a structure gets thrown from side
to side and/or up and down. The structure’s mass, size, and
shape play a role in determine how well they can resist forces
STRUCTURAL FEATURES
Structural features can help structures stand up to forces caused by
natural phenomena. That’s why some bridges collapse while
others remain standing during earthquakes.
Think of tree roots. They are examples of natural structural features
that help keep the tree anchored to the ground during strong
winds.
Similarly, a roof that is strongly attached to a home keeps it from
flying off in strong winds
CONSOLODATION
Lets look at the pictures page 26-29 of the Force Factor text and answer the
following questions:
1) What are tornadoes and earthquakes?
2) How do natural phenomena exert force on structures?