Foundation
Category

K_d

Limit Values
for K_d

I
II
III

0.50/T
0.70/T
0.90/T

0.33 ≤ K_d < 1.0
0.47 ≤ K_d < 1.0
0.60 ≤ K_d  < 1.0

Structure

K_p

All modern reinforced concrete, steel, and wooden structures.

Reinforced masonry and braced steel structures.

Masonry and reinforced concrete buildings with shear walls and for very high and slender structures with a fundamental period T ≥ 2.0 sec

Structures with a flexible story, or with an abrupt change in stiffness between adjacent floors, and for ordinary masonry structures.