What is structural-systems?

A reference guide for choosing the structural systems that support buildings, including grids, columns, floors, lateral stability, and foundations. It connects building form and use with engineering choices such as spans, height, fire rating, and site limits.

Use it to select or compare systems such as load-bearing masonry, set column spacing, describe how forces travel through a building, and coordinate early decisions with structural engineers.

It gives architects a way to compare structural options early, before detailed engineering, when those choices affect space, cost, construction speed, and materials.

structural-systems — Skill for Claude Code by Abhinavbwj

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add Abhinavbwj/Skills-Architects --skill structural-systems

Clone the repo

git clone --depth 1 https://github.com/Abhinavbwj/Skills-Architects

Made for: Claude Code.

Or install Skills-Architects, the plugin that ships this one along with the rest of its 29 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/abhinavbwj/skills-architects/structural-systems/github.svg)](https://agentmods.dev/skills/abhinavbwj/skills-architects/structural-systems)

Your own site

<a href="https://agentmods.dev/skills/abhinavbwj/skills-architects/structural-systems"><img src="https://agentmods.dev/badge/skills/abhinavbwj/skills-architects/structural-systems/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/abhinavbwj/skills-architects/structural-systems"><img src="https://agentmods.dev/badge/skills/abhinavbwj/skills-architects/structural-systems.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 71 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 9,810 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00071	$0.09810
Opus 5	$0.00036	$0.04905
Sonnet 5	$0.00014	$0.01962
Haiku 4.5	$0.00007	$0.00981

Measured 10d ago against content hash 95c1dff964ce, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

structural-systems scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/structural-systems/SKILL.md · 558 lines

How it starts

The opening of the file, as written. The whole thing — 558 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Structural Systems for Architects

Section 1: Structural System Selection

The choice of structural system is one of the earliest and most consequential decisions in building design. It determines floor-to-floor height, column spacing, facade expression, construction programme, cost, and embodied carbon. The following decision tree and system catalogue provide architects with the knowledge to make informed selections before engaging structural engineers.

Decision Tree: Key Variables

Span requirement — What clear span does the programme demand?
Building height — Low-rise (1-4), mid-rise (5-12), high-rise (13-40), supertall (40+)?
Programme type — Residential, office, retail, industrial, mixed-use, cultural?
Cost envelope — Budget-constrained, mid-market, premium?
Construction speed — Is programme duration a critical driver?
Sustainability target — Embodied carbon budget (kgCO2e/m²)?
Fire rating — 30/60/90/120 minutes required?
Site constraints — Access, vibration, noise, adjacent structures?

System Type 1: Load-Bearing Masonry

Span range: 4-7m (with concrete floor slabs or timber joists)
Height limit: Up to 6 storeys (unreinforced); up to 10+ storeys (reinforced/confined)
Typical wall thickness: 215mm (single leaf), 300mm (cavity), 215-327mm (solid at lower storeys)
Slab depth: 150-200mm RC slab on masonry walls; or 200-250mm precast plank
Cost range: 80-140 $/m² (structure only)
Construction speed: 4-6 weeks per floor (traditional); faster with thin-joint masonry
Fire rating strategy: Inherent fire resistance — 215mm solid block achieves 120 min REI
Embodied carbon: 150-280 kgCO2e/m² (depending on block type and mortar)
Best-fit building types: Social housing, low-rise residential, hotels, student accommodation, schools
Exemplar buildings:
- Monadnock Building, Chicago (1891) — 17 storeys, 1.8m thick walls at base
- Mapleton Crescent, London (2018) — 6-storey CLT with masonry facade
- Park Hill, Sheffield (1961) — load-bearing crosswall construction

Read the full file on GitHub · 558 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

10d ago First seen · 558 lines · 71 tokens per session scan A 95c1dff964ce

Subscribe to this mod's changes

structural-systems is a skill published in the GitHub repository Abhinavbwj/Skills-Architects (285 stars, last pushed 3mo ago), licensed MIT. It adds 71 tokens to every session and 9,810 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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structural-systems