Aci-350.3-06.pdf 2021 <TRUSTED ◆>

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Where (P_i) is impulsive force, (W_i) is impulsive liquid weight, and (S_DS) is the short-period spectral acceleration from the site geology. The convective force uses (S_D1) (1-second period) instead. ACI-350.3-06.pdf

Unlike static water pressure (triangle shape), seismic pressure creates an inverted trapezoid or a more complex curve. The PDF contains lookup tables and coefficients to redraw those pressure diagrams for concrete design. Documents like "ACI-350