14.4.2. Mode Shapes

Try these first

1. 1.

   What is a mode shape?

   Hint

   Think about how a structure moves when it vibrates.

2. 2.

   Why are mode shapes important?

   Hint

   Consider their role during earthquakes.

3. 3.

   What does a mode shape describe?

   • The weight of the structure
   • The pattern of deformation
   • The color of the building

   Hint

   Think of how a building moves during an earthquake.

4. 4.

   True or False: Mode shapes affect each other's behavior.

   • True
   • False

   Hint

   Consider if they can interfere with each other.

5. 5.

   A multi-storey building has a fundamental mode shape showing significant sway at its natural frequency. Explain how this affects its seismic design.

   Hint

   Consider the dynamics between built structures and earthquake frequencies.

6. 6.

   Analyze how a bridge reacts differently to varying load distributions in its mode shapes during an earthquake.

   Hint

   Think about how tension and compression alter the structural responses.