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Influence of Earthquake according to SL 203-97

Both horizontal and vertical seismic force can be considered according to SL 203-97. In SL 203-97, seismic angle θ is derived automatically from Kh, so seismic angle θ and seismic angle blow water θ’ are not visible in the frame.

Seismic force on structure

Calculation of horizontal seismic force acting on structure is as same as JTJ 004-89.

Vertical seismic force acting on structure is provided by (Art. 4.1.8):

where:

Eivw

-

vertical seismic force acting at the center of gravity of the wall above the ith cross section [kN/m]

Eihw

-

horizontal seismic force acting at the center of gravity of the wall above the ith cross section [kN/m]

kh

-

coefficient of horizontal seismic acceleration

kv

-

coefficient of vertical seismic acceleration, usually, it‛s ±2/3Kh (Art. 4.3.2)

Giw

-

weight of the structure above the ith cross section [kN/m]

C0

-

meeting coefficient related to the influence of horizontal seismic effect, usually, it‛s 0.5.

Seismic earth pressure

Calculation of seismic earth pressure is as same as JTJ 004-89. The only difference between SL 203-97 and JTJ 004-89 is that SL 203-97 has no "user defined - input Kh, θ" as an option for seismic fortification intensity.

Water influence

Water influence according to Chinese standard is a little different from the water influence according to Mononobe-Okabe or Arrango theory by reducing the water influence using comprehensive influence factor Cz.

Seismic bearing capacity of subsoil

Calculation of seismic bearing capacity of subsoil is as same as JTJ 004-89.