Agent skill

Concrete Column Design

by h30190 in h30190/HJPLUS_Taiwan_Architect_KB

This skill should be used when an architect or structural designer needs to verify PDF-backed concrete column requirements such as longitudinal reinforcement ratio, minimum longitudinal-bar count…

CC-BY-SA-4.0Auto-check passedDocuments & Office

Install Concrete Column Design

skills CLI
$ npx skills add h30190/HJPLUS_Taiwan_Architect_KB --skill concrete-column-design -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install h30190/HJPLUS_Taiwan_Architect_KB concrete-column-design --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/h30190/HJPLUS_Taiwan_Architect_KB.git skills-src && mkdir -p .claude/skills && cp -r skills-src/'raw/建築施工與材料/混凝土結構設計/混凝土柱設計/concrete-column-design' .claude/skills/concrete-column-design && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
concrete-column-design
GitHub stars
158
Token cost
~1.8k tokens
SKILL.md length
747 words
Files
1
Skills in repo
86
Repo updated
First seen
Licence
CC-BY-SA-4.0

At a glance

This skill should be used when an architect or structural designer needs to verify PDF-backed concrete column requirements such as longitudinal reinforcement ratio, minimum longitudinal-bar count…

  • Tasks that involve PDF
  • SKILL.md covers Overview, Section 1: Column Classification, Section 2: Main Bar… and Section 3: Transverse…, plus 6 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Concrete Column Design is an agent skill from h30190/HJPLUS_Taiwan_Architect_KB. This skill should be used when an architect or structural designer needs to verify PDF-backed concrete column requirements such as longitudinal reinforcement ratio, minimum longitudinal-bar count, minimum shear reinforcement, and column splice rules in Taiwan's concrete structure design code.

Its SKILL.md is about 1.8k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts. Compatibility notes: claude-code,opencode,agent-skills

It sits in Documents & Office, covering PDF. The repository describes itself as: 一個開源的台灣AEC產業知識庫,只要你願意共享經驗與知識就歡迎加入我們. The licence is CC-BY-SA-4.0.

When your agent uses it

  • Tasks that involve PDF

Example prompts

  • “/concrete-column-design”

Requirements

  • Python 3
  • Compatibility (from SKILL.md): claude-code,opencode,agent-skills

What it can do on your machine

Read from SKILL.md and the folder at commit 35ed06e. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are python).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

  • Compatibility

    claude-code,opencode,agent-skills

    From compatibility in the SKILL.md frontmatter.

Context cost

Concrete Column Design loads about 1.8k tokens when it runs. Until then it costs about 79 tokens; SKILL.md has 747 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~79
When it runs · the whole SKILL.md, loaded when a task matches
~1.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from h30190/HJPLUS_Taiwan_Architect_KB at commit 35ed06e, republished under its CC-BY-SA-4.0 licence (© h30190). 747 words, ~1,786 tokens.

Download SKILL.mdSave it as .claude/skills/concrete-column-design/SKILL.md (or your agent's skills folder).
name
concrete-column-design
description
This skill should be used when an architect or structural designer needs to verify PDF-backed concrete column requirements such as longitudinal reinforcement ratio, minimum longitudinal-bar count, minimum shear reinforcement, and column splice rules in Taiwan's concrete structure design code.
compatibility
claude-code,opencode,agent-skills
type
Skill
user-invocable
true
license
CC-BY-SA-4.0
metadata.audience
architects
metadata.region
taiwan
metadata.class
C
metadata.regulation
建築物混凝土結構設計規範

Concrete Column Design

Overview

Design requirements for reinforced concrete columns in Taiwan, limited here to items directly verified against the uploaded PDF: longitudinal reinforcement ratio, minimum longitudinal-bar count, minimum shear reinforcement, and column splice rules. Seismic confinement details that were not fully transcribed remain chapter references only. For cover and splice fundamentals, see concrete-general-requirements.


Section 1: Column Classification

1.1 By Cross-Section Shape
TypeSectionReinforcement Type
Rectangular column (矩形柱)Square or rectangleTies (繫筋)
Circular column (圓柱)CircleSpirals (螺旋筋) or circular ties
L-shaped / irregularComposite shapesCombined tie arrangement
1.2 By Primary Loading
TypeCharacteristicsDesign Consideration
Axially loadedGravity load dominantρg within limits; tie spacing
Eccentrically loadedCombined axial + bendingInteraction diagram (P-M curve)
Short columnSlenderness ratio < limitDirect strength calculation
Slender columnSlenderness ratio ≥ limitMoment magnification required

Section 2: Main Bar Requirements (主筋)

2.1 Gross Reinforcement Ratio (ρg)

$$\rho_g = \frac{A_{st}}{A_g}$$

Where:

  • Ast = total area of longitudinal steel
  • Ag = gross cross-sectional area of column
LimitValueReason
Minimum1.0% (0.01)Below this, column cannot resist minimum bending; creep becomes excessive
Maximum8.0% (0.08)Above this, bar congestion at splices and joints prevents proper concrete casting
Practical note from commentaryReinforcement ratio is generally not preferred above 4% when all lap splices occur at one locationConstructability warning only

Design Check: ρg < 1% → ERROR. ρg > 8% → ERROR.

Source: 10.6.1.1 and its commentary.

2.2 Minimum Number of Main Bars
Column ShapeMinimum Bars
Rectangular ties4 bars (one at each corner)
Circular spirals6 bars
Triangular ties3 bars

Source: 10.7.3.1.

2.3 Source-Control Note

Bar-size limits, bundling, and development-length effects must be resolved from Chapter 25 when needed. This skill does not preserve unverified bar-size assumptions.


Section 3: Transverse Reinforcement Clauses

The following clauses were verified in the PDF and should be used instead of inferred detailing rules:

TopicGoverning Clause
Minimum shear reinforcement trigger10.6.2.1
Minimum shear reinforcement formula10.6.2.2
Minimum bar spacing reference10.7.2.1 → Chapter 25.2
Minimum longitudinal-bar count10.7.3.1
Tie / spiral / closed-tie detailing10.7.6.1.2 → Chapter 25.7

Do not infer tie-spacing rules beyond what has been directly transcribed from the PDF.


Section 4: Minimum Shear Reinforcement

When shear reinforcement is required, the PDF gives:

$$A_{v,min} = \max\left(0.062\frac{\sqrt{f'c}}{f{yt}}b_ws,\ 0.35\frac{b_ws}{f_{yt}}\right)$$

This reflects clause 10.6.2.2.

Source: 10.6.2.2.


Section 5: Column Splice Rules Verified from the PDF

5.1 Compression Lap Splices

If column bars are in compression, compression lap splices may be used. Clause 10.7.5.2.1 allows reduction of lap length, but not below 30 cm:

  • tied columns: multiply by 0.83 when the tie confinement requirement inside the splice zone is met
  • spiral columns: multiply by 0.75 when the spiral confinement requirement inside the splice zone is met
Show full SKILL.md (310 more words)Show less
5.2 Tension Lap Splices

Clause 10.7.5.2.2 gives the verified classification:

Bar Stress Under Factored LoadDetail ConditionSplice Type
≤ 0.5fyat any section, spliced bars ≤ 50% and splice locations staggered by at least ψgldClass A
≤ 0.5fyall other casesClass B
> 0.5fyall casesClass B

Source: 10.7.5.2.2, Table 10.7.5.2.2.

5.3 Seismic Restrictions

Special seismic column confinement and splice-location restrictions must be checked directly against Chapter 18. This skill does not restate unverified hinge-zone dimensions.


Section 6: Placement and Support Details Verified from the PDF

  • bottom tie or closed tie in a story must be placed no farther than one-half tie spacing above the footing or slab top: 10.7.6.2.1
  • top tie or closed tie in a story must be placed no farther than one-half tie spacing below the lowest horizontal reinforcement of the slab / capital / drop panel; with beams or brackets on all four sides, not farther than 7.5 cm below the lowest beam or bracket reinforcement: 10.7.6.2.2
  • if anchors or precast connectors are placed at a column end, transverse reinforcement must be provided within 12.5 cm of the end: 10.7.6.1.5, 10.7.6.1.6

Section 7: AI Design Check Table — Column

CheckConditionAI Action
ρg minimumρg < 1%ERROR: Insufficient longitudinal reinforcement. Column cannot resist minimum moment.
ρg maximumρg > 8%ERROR: Excessive reinforcement — casting impossible at splices.
Compression splice reduction0.83 or 0.75 reduction applied without clause 10.7.5.2.1 confinement conditionERROR: Splice reduction not justified.
Tension splice classClass A used when stress/detail condition in 10.7.5.2.2 is not metERROR: Upgrade to Class B.
Seismic splice locationColumn is part of seismic system and Chapter 18 location check not performedWARNING: Verify Chapter 18 splice restrictions before approval.
Min bars (rectangular)< 4 main barsERROR: Minimum 4 bars required for rectangular tied column.

Section 8: MCP Tool Examples

python
# Search for column reinforcement ratio requirements
taiwan-building-code_search_building_code(query="柱 縱向鋼筋比 ρg 最小 最大", limit=10)

# Search for tie spacing requirements
taiwan-building-code_search_building_code(query="柱 繫筋間距 橫向鋼筋", limit=10)

# Search for seismic column requirements
taiwan-building-code_search_building_code(query="柱 耐震 特殊圍束筋 塑鉸區 lo", limit=10)

# Search for splice location in columns
taiwan-building-code_search_building_code(query="柱 搭接位置 塑鉸區 禁止", limit=10)

# Official interpretations
taiwan-building-code_search_building_interpretations(query="柱 繫筋 圍束 計算方式")

Additional Resources

© h30190, CC-BY-SA-4.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in raw/建築施工與材料/混凝土結構設計/混凝土柱設計/concrete-column-design of h30190/HJPLUS_Taiwan_Architect_KB.

Open the folder on GitHubat commit 35ed06e

Compare with similar skills

Concrete Column Design next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

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Questions about Concrete Column Design

What does Concrete Column Design do?

This skill should be used when an architect or structural designer needs to verify PDF-backed concrete column requirements such as longitudinal reinforcement ratio, minimum longitudinal-bar count…. Concrete Column Design is an agent skill from h30190/HJPLUS_Taiwan_Architect_KB. This skill should be used when an architect or structural designer needs to verify PDF-backed concrete column requirements such as longitudinal reinforcement ratio, minimum longitudinal-bar count, minimum shear reinforcement, and column splice rules in Taiwan's concrete structure design code.

When should I use Concrete Column Design?

Concrete Column Design fits situations like: tasks that involve PDF.

How do I install Concrete Column Design in Claude Code?

Run `npx skills add h30190/HJPLUS_Taiwan_Architect_KB --skill concrete-column-design -a claude-code`. Or copy the skill folder (raw/建築施工與材料/混凝土結構設計/混凝土柱設計/concrete-column-design in h30190/HJPLUS_Taiwan_Architect_KB) into .claude/skills/concrete-column-design in your project. Claude Code loads it when a task matches its description.

How do I install Concrete Column Design in Codex?

Run `npx skills add h30190/HJPLUS_Taiwan_Architect_KB --skill concrete-column-design -a codex`. Or copy the skill folder (raw/建築施工與材料/混凝土結構設計/混凝土柱設計/concrete-column-design in h30190/HJPLUS_Taiwan_Architect_KB) into .agents/skills/concrete-column-design in your project. Codex loads it when a task matches its description.

Can I use Concrete Column Design in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add h30190/HJPLUS_Taiwan_Architect_KB --skill concrete-column-design -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/concrete-column-design, .gemini/skills/concrete-column-design, .github/skills/concrete-column-design and .opencode/skills/concrete-column-design in your project.

What does Concrete Column Design need to run?

SKILL.md names no scripts, command-line tools or credentials: Concrete Column Design is instructions for the agent only. Our summary lists: Python 3. Compatibility (from SKILL.md): claude-code,opencode,agent-skills.

Does Concrete Column Design access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Concrete Column Design safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Concrete Column Design use?

Concrete Column Design is published under the CC-BY-SA-4.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Concrete Column Design use?

About 1.8k tokens (SKILL.md is roughly 7.1k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Concrete Column Design?

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Who maintains Concrete Column Design?

h30190 (a GitHub user) maintains it in h30190/HJPLUS_Taiwan_Architect_KB, which has 158 GitHub stars. The repository holds 86 skills in this directory. The repository was last updated on October 8, 2026.

Source: h30190/HJPLUS_Taiwan_Architect_KB on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.