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Influence of Earthquake according to SL 203-97

Both horizontal and vertical seismic forces 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 the horizontal seismic force acting on a structure is the same as JTJ 004-89.

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




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



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



coefficient of horizontal seismic acceleration



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



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



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

The calculation of the seismic bearing capacity of a subsoil is the same as JTJ 004-89.

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