11.19. Coupled Lateral-Torsional Vibrations

Try these first

1. 1.

   What are coupled vibrations?

   Hint

   Think about how two types of movement might influence one another.

2. 2.

   Define eccentricity in relation to structural vibrations.

   Hint

   Consider how these centers interact in a structure.

3. 3.

   What primarily causes coupled lateral-torsional vibrations?

   • Alignment of centers
   • Eccentricity
   • Material properties

   Hint

   Think about offset locations in a structure.

4. 4.

   Torsional amplification increases demands on which structural elements?

   • True
   • False

   Hint

   Consider where stress might be concentrated in a structure.

5. 5.

   A building designed with a center of mass significantly offset from its center of stiffness is hit by a lateral seismic force. Calculate the resultant torsional effect considering the displacement patterns.

   Hint

   Use calculations from torsional dynamics.

6. 6.

   In a seismic analysis of a 10-story irregular building, each floor has an unequal mass distribution. Model the building in a dynamic response simulation and assess if it meets seismic codes.

   Hint

   Refer to simulation software for modeling structures under dynamic loads.