34.7.1. Lateral Force at Each Storey (IS 1893)

Try these first

1. 1.

   What is the formula for calculating the lateral force at each storey?

   Hint

   Think about how base shear and weight contribute to lateral forces.

2. 2.

   Define seismic weight.

   Hint

   Remember it relates to the floor's loading.

3. 3.

   What does Qᵢ represent in the formula for calculating lateral force?

   • Seismic weight
   • Lateral force at floor i
   • Base shear

   Hint

   Think about what you’re trying to calculate with the formula.

4. 4.

   True or False: The base shear can be calculated without knowing the total seismic weight.

   • True
   • False

   Hint

   Link it back to the formula for base shear.

5. 5.

   Calculate the lateral force at each storey for a building with three floors: Floor 1 has 1000 kg at 3m, Floor 2 has 2000 kg at 6m, Floor 3 has 3000 kg at 9m. Assume a base shear of 2000 N.

   Hint

   Let’s sum contributions of weight and height first!

6. 6.

   Discuss how incorrect lateral force calculations could lead to failures in a building’s design. Give examples from case studies of seismic zones.

   Hint

   Look into historical examples of building failures during earthquakes.