Table United States 1

Table ASCE 7- 1 - Site Coefficients F_a and F_v

Site Class	values of F_a					values of F_v
Site Class	S_S ≤0.25	S_S = 0.5	S_S = 0.75	S_S = 1.0	S_S ≥1.25	S₁ ≤0.1	S₁ = 0.2	S₁ = 0.3	S₁ = 0.4	S₁≥0.5
A	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8	0.8
B	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0
C	1.2	1.2	1.1	1.0	1.0	1.7	1.6	1.5	1.4	1.3
D	1.6	1.4	1.2	1.1	1.0	2.4	2.0	1.8	1.6	1.5
E	2.5	1.7	1.2	0.9	0.9	3.5	3.2	2.8	2.4	2.4
F	^*	^*	^*	^*	^*	^*	^*	^*	^*	^*

^* site specific geotechnical evaluation required

Table United States 1(a)

Table ASCE 7 - 1(a) - Site Classification

Site Class	shear wave velocity in top 100 ft (30 m)	average standard penetration resistance in top 100 ft (30 m)	average undrained shear strength in top 100 ft (30 m)
Site Class
A - hard rock	> 5000 ft/s (> 1500 m/s)	not applicable	not applicable
B - rock	2500 to 5000 ft/s (760 to 1500 m/s)	not applicable	not applicable
C - very dense soil and soft rock	1200 to 2500 ft/s (370 to 760 m/s)	> 50	> 2000 psf (>100 kPa)
D - stiff soil	600 to 1200 ft/s (180 to 370 m/s)	15 to 50	1000 to 2000 psf (50 to 100 kPa)
E - soil	< 600 ft/s (< 180 m/s)	< 15	< 1000 psf (< 50 kPa)
E - soil	any soil profile having more than 10 ft (3 m) of soil having the following characteristics: plasticity index PI > 20 moisture content w ≥40% undrained shear strength, < 500 psf (25 kPa)
F - soils requiring site specific evaluation	soils vulnerable to failure or collapse peats and/or highly organic clays very high plasticity clays very thick soft/medium clays