40.4. Seismic Weight and Base Shear

Try these first

1. 1.

   What is the typical percentage of live load considered for seismic weight in normal conditions?

   Hint

   Think about the general factor applied to live loads.

2. 2.

   What does the formula V = A × W_h represent?

   Hint

   Remember the components involved in assessing base shear.

3. 3.

   What is considered in the calculation of seismic weight (W)?

   • Only dead load
   • Dead load and 25% of live load
   • Only live load

   Hint

   Think of what loads contribute to the seismic weight.

4. 4.

   Base shear (V) can be calculated using which formula?

   Hint

   Remember the relationship between shear, weight, and acceleration.

5. 5.

   Calculate the seismic weight and base shear for a proposed 10-story hospital building. The dead load is estimated at 500,000 kg, and the live load is 100,000 kg with a design seismic coefficient A = 0.3. Explain your reasoning and calculations.

   Hint

   Break down your calculations systematically.

6. 6.

   Discuss how increasing seismic zones from III to V would impact the design of seismic weight and base shear calculations.

   Hint

   Think about the relationship between seismic zone classification and design parameters.