Source: https://guthlabs.ai/docs/instruments/reinforced-concrete-beam-singly-reinforced-flexural-capacity/qualification/

instrument qualification / verified-with-binding-errata

# Reinforced Concrete Beam — Singly Reinforced Flexural Capacity qualification

Verified with errata that must be applied at binding time.

Status: **VERIFIED_WITH_ERRATA**Lifecycle: **verified-with-binding-errata**

## Ledger verdict

Verified with errata that must be applied at binding time.

**Status**: VERIFIED_WITH_ERRATA

**Tranche**: tranche-5

**Review vectors**: 4

**Ledger rows**: 1

## Applied errata

No tranche erratum is attached to this unique-name record.

### Stress-test correction

````
{
  "vector_inputs": {
    "As": 300,
    "fy": 500,
    "fc": 40,
    "b": 250,
    "d": 450
  },
  "wrong_outputs": {
    "a_mm": 14.823529,
    "Mn_kN_m": 66.388235,
    "phiMn_kN_m": 59.749412
  },
  "corrected_outputs": {
    "a_mm": 17.647059,
    "Mn_kN_m": 66.176471,
    "phiMn_kN_m": 59.558824
  },
  "method": "a = As*fy/(0.85*fc*b) = 150000/8500 = 17.647059 mm, not 14.823529 (a ~1000/8500 arithmetic slip). Mn and phiMn recomputed downstream from the corrected a. rho/rho_min/rho_max/check flags do not depend on a and were unaffected."
}
````

## Adversarial re-test context

The full catalog was re-tested from boundary, convention, and self-check angles in 2,787 requests. Five genuine computational defects were independently verified and corrected. This page reports the current ledger state for this instrument; it does not imply product deployment or interface qualification.

## Release gate

Bind every attached correction, replay the affected vectors, enforce boundary validation, and preserve evidence before describing the executable surface as qualified.

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/reinforced-concrete-beam-singly-reinforced-flexural-capacity/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/reinforced-concrete-beam-singly-reinforced-flexural-capacity/mechanism/>)[03**Implementation**](<https://guthlabs.ai/docs/instruments/reinforced-concrete-beam-singly-reinforced-flexural-capacity/implementation/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `STRESS_TEST_RECEIPT.json`

- `STRESS_TEST_CORRECTIONS_APPLIED.json`