AS/NZS 1170.5 Response Spectrum

Calculate elastic and design response spectra with NZ hazard factors, damping modifiers, and near-fault adjustments.

Design Parameters

Hazard Parameters

Location (Table 3.3) Hazard factor Z Return period factor R Structural performance factor S_p Ductility μ Equivalent damping ratio ξ_e Site subsoil class Near-fault distance D (km)

Treat as near-field for damping modifier (α = 0.25) Show calculation notes

Spectrum Controls

Maximum period T_max (s) Period increment ΔT (s) Model period T₁ (s)

Table 3.3 Reference (Hazard factor Z)

Values reproduced from NZS 1170.5 Table 3.3. Confirm against the latest revision for project work.

Filter by location

Location	Z	D (km)

Disclaimer

Tool applies NZS 1170.5 methods for convenience only. Verify inputs, assumptions, and results with the latest standard and project requirements.

Made in New Zealand · Beta in progress

AS/NZS 1170.5 Response Spectrum

Design Parameters

Hazard Parameters

Spectrum Controls

Design Spectrum

Table 3.3 Reference (Hazard factor Z)

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