Grade

Function and Size of Building

Importance Factor

S

Facilities for storage and treatment of hazardous materials with the total floor area not less than 1000m², hospitals, broadcasting stations, power plants, telegraph-telephone offices, public service facilities and facilities for the old and the weak, apartment buildings with the total number of stories above the ground level not less than 15.

1.5

1

Areas, sporting facilities, transportation facilities, exhibition and convention facilities, and stores with the total floor not less than 5000m², lodging facilities, officiates, dormitories and apartment buildings with the number of stories less than 5.

1.2

2

For all other buildings

1.0

Type

Description

Site coefficient

S₁

A soil profile with either:
(a) A rock-like material characterized by a shear-wave velocity not less than 70m/s, or
(b) Medium-dense to dense or medium-stiff to stiff soil conditions, where soil depth is less than 60m

1.0

S₂

A so profile with predominantly medium-dense to dense or medium-stiff to stiff soil conditions, where the soil depth not less than 60m

1.2

S₃

A soil profile containing more than 6m of soft to medium-stiff clay but not more than 12 of soft clay

1.5

S₄

A soil profile containing more than 12m of soft clay characterized by a shear wave velocity less than 150m/s

2.0