Table 1   Deformation coefficient K for natural frequencies less than 10 Hz

Type of load-bearing structure
(for horizontal forces)

 SCI SCII SCIII

Steel or concrete frames

Structural concrete walls and cores or diagonal
steel bracing

Timber structures

Structural masonry walls
 - unreinforced
 - reinforced

Girder bridges (girders and piers)

Arch bridges and frame bridges

Fixed bridge bearings

 2.5

2.0

1.7


1.2

-

-

-

 2.0

1.7

1.4


1.1

2.5

2.2

1.0

 1.4

1.3

1.2


1.0

1.5

1.4

1.0