13.13. Importance of Mode Shapes in Seismic Design Codes

Try these first

1. 1.

   What is the purpose of modal analysis in seismic design?

   Hint

   Think about structural safety in emergencies.

2. 2.

   Name one building code that requires modal analysis.

   Hint

   Consider codes pertaining to earthquake-prone zones.

3. 3.

   Why is modal analysis required for buildings over 40 m in height?

   • To save costs
   • To ensure safety against earthquakes
   • To improve aesthetics

   Hint

   Consider the relationship between height and structural stability.

4. 4.

   True or False: Mode shapes significantly affect how forces are distributed across storeys.

   • True
   • False

   Hint

   Think about the impact of modal analysis on structural response.

5. 5.

   Analyze a three-storey building proposed for a seismic zone. Discuss how you would conduct a modal analysis, detailing steps and expected outcomes.

   Hint

   Focus on the role of each step in ensuring safety.

6. 6.

   A 50 m tall building has been designed without modal analysis. Predict potential issues that could arise during an earthquake.

   Hint

   Consider all the factors that contribute to a building's seismic responsiveness.