Structural Concrete - Hassoun

802 Chapter 20 Seismic Design of Reinforced Concrete Structures
Figure 20.3 Design response spectrum. ASCE 7-10 Minimum Design Loads for Buildings
and Other Structures, 2010. With permission from ASCE
Table 20.5
Seismic Design Category Based on Short-Period Response Accelerations Parameter
[Table 1613.3.5(1) of IBC 2012]
Risk Category
Value of S DS
I or II III IV
S DS < 0.167 g A A A
0.167 g ≤ S DS < 0.33 g B B C
0.33 g ≤ S DS < 0.50 g C C D
0.50 g ≤ S DS D D D
Table 20.6
Seismic Design Category Based on 1-s Period Response Acceleration Parameter
[Table 1613.3.5(2) of IBC 2012]
Risk Category
Value of S D1
I or II III IV
S D1 < 0.067 g A A A
0.067 g ≤ S D1 < 0.133 g B B C
0.133 g ≤ S D1 < 0.20 g C C D
0.20 g ≤ S D1 D D D