Professional tool for earthquake engineering and seismic design based on ASCE 7-16 standards.
Seismic analysis is essential for designing structures that can withstand earthquake forces. The analysis considers ground motion, soil conditions, and structural characteristics.
Key Insight: Effective seismic design balances strength, ductility, and energy dissipation to protect life safety during earthquakes.
Simplified method using static forces equivalent to earthquake effects:
V = Cs × W
Where Cs is seismic coefficient and W is building weight.
Dynamic analysis using design spectrum:
Sa = f(T, ξ, Ss, S1)
Where T is period, ξ is damping, Ss and S1 are spectral accelerations.
Direct integration of equations of motion using actual or synthetic records:
mü + cẋ + kx = -müg
Most accurate but computationally intensive method.
Analysis using structure's vibration modes:
ΦTMΦü + ΦTCΦẋ + ΦTKΦx = -ΦTMüg
Efficient for linear elastic analysis.
| Parameter | Description | Typical Values |
|---|---|---|
| Ss | Short period spectral acceleration | 0.5g - 3.0g |
| S1 | 1-second spectral acceleration | 0.2g - 1.5g |
| TL | Long period transition | 4s - 16s |
| Fa | Site coefficient (0.2s) | 0.8 - 2.5 |
| Fv | Site coefficient (1.0s) | 0.8 - 3.5 |
| SDS | Design spectral acceleration (short period) | 0.33g - 2.0g |
| SD1 | Design spectral acceleration (1s period) | 0.13g - 1.0g |