Seismic action

The seismic check is pseudo-static, with the Mononobe-Okabe formulation (inertia angle θ = arctan[k_h/(1−k_v)]).

Seismic coefficients

You can enter k_h and k_v directly, or import a GeoStru PS report (.txt): the program extracts a_g, F₀, T_C for the four limit states, the subsoil and topographic category, and computes, for retaining walls* (NTC §7.11.6.2.1):

• a_max = S_S · S_T · a_g
• k_h = β_m · a_max/g, with β_m = 0.38 (SLV/SLC) and 0.47 (SLO/SLD)
• k_v = ± 0.5 · k_h

SLV is applied straight away; from the small table you can switch to another limit state. The site coordinates are copied into General data.

Effect on the checks

With k_h > 0 the program generates the seismic combination (see Design code and combinations); global stability switches to the seismic factors (γ_R2 = 1.2, unit M2).

---

Found an error on this page? Let us know or open a Pull Request.