nch433-analisis

NCh433 Analysis

Use this skill for a first-pass seismic screening when the user provides location, use, height, or basic building data.

Normative framing

• Working technical frame: NCh433:2026 (INN, published 26-03-2026), which refunds D.S. N° 61/2011 and NCh433:1996 Mod.2009 and leaves the latter technically non-vigent.
• Screening notes: the 2026 version consolidates site seismic classification (Vs30, Tg) and makes the 30 m soil boring mandatory for most projects (no one-category degradation as under DS 61).

Operative steps

1. Check references/normative-registry.yml and references/source-lookup-protocol.md before using NCh433 as the technical frame.
2. Identify the building type and the minimum inputs available.
3. Note any location-specific assumptions.
4. Summarize likely seismic considerations at a screening level.
5. Flag when a structural engineer or formal calculation is required.

Output shape

• Executive summary
• Input summary
• Seismic screening notes
• Key uncertainties
• Follow-up requirements

Guardrails

• Do not provide a structural design.
• Do not invent zone values or coefficients without a source.
• If you need a design-grade conclusion, defer to the competent structural professional and the verified technical source.
• If a technical reference is missing, recover it from references/source-of-truth/ and state that the result is screening-level only.