6.5.1. Concept of Base Excitation

Try these first

1. 1.

   What does base excitation refer to in earthquake engineering?

   Hint

   Think about how the ground's movement affects the structure directly.

2. 2.

   What is the formula for absolute displacement in the context of base excitation?

   Hint

   It combines two types of displacement.

3. 3.

   What is base excitation?

   • Ground motion affecting a structure's base
   • Wind load on buildings
   • Pressure from snow on rooftops

   Hint

   Consider the external forces acting on the structure.

4. 4.

   True or False: Absolute displacement is calculated as the sum of relative displacement and ground displacement.

   • True
   • False

   Hint

   Think about how motion is added together.

5. 5.

   Analyze a scenario where the ground displacement during an earthquake reaches 1 meter and the relative displacement of the structure is recorded at 0.7 meters. Calculate the absolute displacement, and discuss how this might impact the structural integrity.

   Hint

   Ensure you apply the formula for absolute displacement correctly.

6. 6.

   Consider a building designed without accounting for base excitation effects. Discuss potential real-world implications during a significant seismic event and suggest measures that could be taken to mitigate such risks.

   Hint

   Reflect on how engineers might adapt designs in response to these challenges.