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 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.