31 lines
1.6 KiB
Markdown
Executable File
31 lines
1.6 KiB
Markdown
Executable File
# Example: Bridge Engineering
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**Status:** Draft
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**Phase:** The Bedrock Phase
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## What This Example Demonstrates
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Engineering context preservation (OE-0003), the context record structure, and verification.
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## The Observation
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A bridge designed without a preserved context record — one that records only the final design but not the reasoning, alternatives, constraints, and verification — creates risk for future engineers who must maintain, modify, or load-rate the bridge.
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## Context Record Applied
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A well-preserved bridge engineering context record would contain:
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| Field | Example Content |
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|---|---|
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| **Decision** | Use a truss design with a 40m span |
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| **Observation** | Site survey showed 40m crossing required; bedrock at 12m depth |
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| **Alternatives** | Cable-stayed (rejected: higher maintenance cost), arch (rejected: insufficient abutment capacity) |
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| **Constraints** | Maximum load 40 tonnes; environmental: tidal zone; economic: prefabrication required |
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| **Reasoning** | Truss allows prefabrication, meets load requirements, and can be erected in tidal window |
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| **Verification** | Load testing to 1.5x design load; finite element analysis corroborated by physical test |
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| **Lineage** | Builds on standard truss design from [prior project reference] |
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| **Assumptions** | Steel grade S355 available; corrosion protection maintains for 50-year design life |
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## Self-Fading Assessment
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This example transports the reader from the abstract context record structure (OE-0003) to a concrete instance. Once the reader understands how each field maps to a real engineering decision, the example has served its purpose. |