34.7. Vertical Distribution of Base Shear

Try these first

1. 1.

   What does lateral force mean in the context of seismic design?

   Hint

   Think about how buildings respond when shaken.

2. 2.

   Define storey shear in simple terms.

   Hint

   Consider what happens to weight and force at different heights.

3. 3.

   What is the primary purpose of calculating lateral forces in seismic design?

   • To understand the building's aesthetic
   • To ensure structural safety
   • To minimize construction cost

   Hint

   Think about why we need buildings to withstand earthquakes.

4. 4.

   True or False: Storey shear is only a concern in buildings above 10 stories.

   • True
   • False

   Hint

   Recall that all structures need to withstand lateral forces.

5. 5.

   A six-storey building has the following weights and heights: Storey 1: 50 kN (2m), Storey 2: 70 kN (3m), Storey 3: 80 kN (4m), Storey 4: 90 kN (4m), Storey 5: 100 kN (5m), Storey 6: 110 kN (5m). Calculate the lateral force at Storey 4 given a base shear of 350 kN.

   Hint

   Remember to sum the forces properly.

6. 6.

   Discuss the implications of ignoring storey shear in a tall building. What failure modes might occur?

   Hint

   Consider how well the bottom can support the top.