13.12. Experimental Determination of Mode Shapes

Try these first

1. 1.

   What is Impact Hammer Testing?

   Hint

   Think of it as using a hammer to get vibrations.

2. 2.

   Name one tool used in modal tests.

   Hint

   What tool measures acceleration?

3. 3.

   What is the main purpose of modal testing?

   • To enhance aesthetic design
   • To determine structural responses to vibrations
   • To evaluate material costs

   Hint

   Think about the objective of testing methods.

4. 4.

   True or False: Laser vibrometers require contact with the structure.

   • True
   • False

   Hint

   Consider how these instruments work.

5. 5.

   Design an experimental setup for modal testing of an existing bridge. Describe the methods, tools, and expected outcomes.

   Hint

   Consider the safest way to analyze an existing structure.

6. 6.

   Explain how OMA could be advantageous over traditional modal testing in assessing an older building's safety without disrupting its occupancy.

   Hint

   Think about the implications of using artificial forces.