Design Earthquake Response Spectrum Affected by Shallow Soil Deposit

Table 4

Midperiod amplification factor (DRS-1).

	500-year return period (0.11 g)			1000-year return period (0.154 g)			2400-year return period (0.22 g)
	IBC 2015	Analysis result		IBC 2015	Analysis result		IBC 2015	Analysis result
		Mean	σ		Mean	σ		Mean	σ
SB	1.00	1.00	0.001	1.00	1.01	0.001	1.00	1.00	0.021
SC	1.69	1.15	0.123	1.65	1.17	0.130	1.58	1.21	0.148
SD	2.36	1.49	0.141	2.18	1.51	0.141	1.96	1.56	0.126
SE	3.47	2.01	0.265	3.34	1.97	0.300	3.12	1.85	0.384