Steel structure manufacturer since 2009 · 8 fabrication bases in China
Servicios
Steel detailing and connection design, with responsibility written down
Most disputes on steel projects start with one question: who was responsible for that detail? This page sets out what we design, what we only draw, and what happens when a drawing is wrong.
Since 2014
Group design company
Tekla
Detailing model
4 code families
GB, AISC, EN, AS/NZS
2 days
RFI list from receipt
Service levels
Three levels, three different responsibilities
| Nivel | What we do | Design responsibility | Typical client |
|---|---|---|---|
| Scheme design | Structural system, member sizes, tonnage estimate | GGSteel for the scheme; a local engineer usually checks and stamps | Owners with a brief |
| Connection design (delegated) | Design of connections from member forces on your drawings | Your engineer for members; our engineer for connections | Contractors with IFC drawings |
| Shop drawings only | Model and drawings from fully detailed design | Your engineer of record | Contractors with complete details |
Local stamping: most countries require a locally registered engineer to sign structural design. We provide calculations and drawings in the format your engineer needs; we do not claim a stamp we cannot give.
Inputs
What we need before detailing starts
- IFC or tender drawings in DWG, IFC or Revit, not only PDF
- Member forces for connections we design (shear, moment, axial, by load case)
- Design code and the connection design option your engineer prefers
- Steel grades, bolt grades, weld grade or execution class
- Architectural and MEP models for clash checking, where available
- Erection constraints: crane capacity, splice preferences, delivery zones
Connection design
Who designs the connections, by code
| Code | Options | What we provide |
|---|---|---|
| AISC 303 (USA) | Option 1: shown in full by the EOR. Option 2: fabricator completes simple connections from tables. Option 3: delegated to the fabricator’s licensed engineer | Options 2 and 3, with calculations for your EOR’s review |
| EN 1993-1-8 (Europe) | Joints designed by the designer or delegated with execution specification | Joint calculations per EN 1993-1-8 |
| GB 50017 (China) | Usually the design institute shows main joints; fabricator completes details | Joint calculations and node drawings |
| AS 4100 (Australia) | Design or delegated design per specification | Calculations to AS 4100 |
Option numbering per AISC 303. Your contract decides which option applies.
Approval cycle
How drawings move between us and your engineer
01
RFI list
Missing data and conflicts listed within 2 working days.
02
Model
Frame, connections and openings modelled.
03
Submission
Drawings issued in batches by zone.
04
Review
Your engineer returns each sheet coded A, B, C or D.
05
Revision
B and C comments closed out and re-issued.
06
Release
Only A and B sheets go to the workshop.
| Code | Meaning | Can fabrication start? |
|---|---|---|
| A | Aprobado | Yes |
| B | Approved as noted | Yes, with comments applied |
| C | Revise and resubmit | No |
| D | Rejected | No |
Typical review turnaround we plan for: 5–10 working days per batch; typical rounds: 2. Your specification may set its own codes.
When a drawing is wrong
Who pays for detailing errors
| Cause | Who is responsible | What happens |
|---|---|---|
| Our detail does not match the approved design | GGSteel | We fix or remake the member at our cost |
| Dimension or hole error in our shop drawing | GGSteel | Same, even if your engineer approved the sheet |
| Design drawing was wrong or changed | Your engineer | Change logged with cost and time before we proceed |
| Site conditions differ from drawings | By contract | Site fix proposed and priced |
Approval does not move responsibility. Under AISC 303, approval confirms that we read the design correctly; we remain responsible for the dimensions and details in our shop drawings.
Entregables
What you receive, and in which format
| Deliverable | Formato | Detail level |
|---|---|---|
| Detailing model | Tekla; IFC export | LOD 400 (fabrication) for steel; LOD 300 is design only |
| GA and marking plans | PDF, DWG | Every member mark located |
| Assembly and part drawings | PDF, DWG | Every hole, weld and cut |
| CNC files | DSTV / NC1 | For our machines; available on request |
| Cálculos de conexiones | Where connection design is in scope | |
| BOM, bolt list, paint areas | Excel | By zone and member |
| RFI and revision log | Excel | Every question and change, dated |
From our engineers
Clashes we look for before you see the drawings
Rebar through steel. In SRC columns, rebar holes, couplers and studs are placed from a combined model. CGN HQ is a project of this type.
Services through beams. Duct and pipe openings in webs are agreed before detailing, with reinforcement where needed.
Splices and cranes. Splice positions follow crane capacity and transport length, not only member forces.
Can you work from Revit or Rhino models?
Yes. We import via IFC into Tekla and report anything that does not translate.
How long does detailing take?
About 2–4 weeks for 1,000–3,000 t, issued by zone so fabrication can start earlier.
Do you design to Eurocode or AISC?
Yes, for connections and scheme design. Your local engineer of record keeps responsibility for the structure.
Will you sign an NDA before we send drawings?
Yes.
How many detailers and engineers do you have?
Numbers to confirm.
Drawing review
Send drawings, get an RFI list in 2 working days
A free review before you commit to an order.