SDOF natural frequency and period

A teaching lumped mass has $m=50{,}000\text{ kg}$ and lateral stiffness $k=2.0\times10^6\text{ N/m}$.

Mass and stiffness sensitivity

Starting from $T=0.993\text{ s}$, double the mass while holding stiffness fixed.

P-Delta magnification as a benchmark, not a solver substitute

An idealized beam-column screen has $P/P_{cr}=0.40$ and first-order moment $M_1=100\text{ kN·m}$.

Winkler soil-spring parameter from a consistent load–settlement point

A geotechnical model or test indicates that a representative contact pressure of $q=120\text{ kPa}$ corresponds to $\delta=20\text{ mm}$ settlement for the foundation/soil idealization being calibrated. Estimate a secant Winkler modulus.

Response spectrum vs equivalent lateral force

A tall or irregular building has significant higher-mode and torsional behavior. Why might a response-spectrum procedure be selected?

STAAD.Pro → STAAD Foundation Advanced handoff

A superstructure analysis is accepted and isolated/combined/mat/pile-cap foundation design will continue in STAAD Foundation Advanced (SFA).