Question

If stiffness of building increases then base shear of building also increases?

Answer 1

Base shear should be more or less than what?

Let us try to understand structural dynamics using some static approaches.

Building is heavy -> High Base Shear

Building is stiff -> High Base Shear

Building located near fault -> High Base Shear

Building Weight

Imagine you have two buildings. One weights 50,000 kips while the other weights 20,000 kips. And let us say that the ground is excited at 0.4g of acceleration. Now in no way the entire building will be shaked at this value of acceleration, but just for the sake of simplifying we say that it is.

So building 1 will have a base shear of 50,000 * 0.4 = 20,000 kips

Building 2 will have a base shear of 20,000*0.4 = 8,000 kips

So there you have variation of building base shear with respect to weight of the structure.