32.5.4. Importance of Seismic Weight and Importance Factor

Try these first

1. 1.

   What does seismic weight refer to?

   Hint

   Think about the forces that keep the building grounded.

2. 2.

   Define the term importance factor.

   Hint

   Consider the role of buildings during emergencies.

3. 3.

   What is a seismic weight?

   • Total weight during normal operations
   • Total gravitational force during seismic events
   • Weight of structural materials

   Hint

   Think about the forces acting on a building during an earthquake.

4. 4.

   True or False: Importance factors are used to account for the significance of a structure.

   • True
   • False

   Hint

   Consider how emergency services are designed.

5. 5.

   A school building has a seismic weight of 350 tons and an importance factor of 1.0. Calculate the base shear and discuss how this changes if it becomes a hospital with an importance factor of 1.5.

   Hint

   Use the formula: Base Shear = Seismic Weight × Importance Factor.

6. 6.

   Discuss the engineering considerations that must be taken for a residential building with low seismic weight and importance factor versus a high-rise commercial building with a high seismic weight and importance factor.

   Hint

   Compare typical design approaches based on function and size.