Steel Structures & Pre-Engineered Buildings – Design, Fabrication, Erection and Technical Standards

INDUSVINA COMPANY LIMITED

A steel structure must not only contain enough steel – it must be correct from design to operation

Steel structures and Pre-Engineered Buildings are suitable solutions for factories, warehouses, logistics centres, distribution facilities and industrial buildings requiring large clear spans, rapid construction, future expansion and document-based quality control.

However, the advantages of steel can only be realised when the entire project chain is controlled: survey, design, shop drawings, material selection, fabrication, welding, surface treatment, transportation, erection, inspection, handover and life-cycle maintenance.

Design for fabrication – fabricate for accurate erection – erect for safe operation – maintain for a longer service life.

Steel Structures Pre-Engineered Buildings Steel Fabrication Steel Erection QC/QA & Hold Points

1. What are steel structures and Pre-Engineered Buildings?

A steel structure is a load-bearing system comprising columns, beams, rafters, bracing members, connection plates, bolts and other steel components that transfer structural loads to the foundation. It may be used independently or combined with reinforced concrete, wall systems, composite floors and MEP systems.

A Pre-Engineered Building – PEB is a building in which the main structural members are analysed, designed and fabricated in a controlled factory environment, then transported to the construction site for erection in accordance with approved documents.

Conventional steel structures

May use hot-rolled sections or built-up steel members.
Suitable for industrial, civil and specialised infrastructure projects.
Flexible design based on structural loading and architectural requirements.
May be integrated with composite floors, concrete systems and complex bracing.

Pre-Engineered Buildings

Member sections are optimised according to forces along the frame.
Industrial fabrication and modular erection enable faster delivery.
Suitable for factories, warehouses and large-span buildings.
Convenient for future expansion or operational changes.

A PEB is not merely a steel frame. It is an integrated system combining structural design, connection detailing, cladding, drainage, ventilation, process loads, construction requirements and long-term building operation.

2. Technical components of a Pre-Engineered Building

2.1. Primary structural system

Built-up or hot-rolled I/H steel columns.
Roof rafters, main beams and connecting beams.
Crane runway beams where overhead cranes are installed.
Connection plates, stiffeners and end-plate connections.

2.2. Secondary structural system

C- or Z-section roof and wall purlins.
Roof, wall and end-wall bracing systems.
Sag rods, anti-roll members and stability components.
Secondary frames for doors, canopies and equipment.

2.3. Cladding system

Roof sheets, wall sheets or insulated panels.
Gutters, downpipes and roof-edge details.
Skylights, ventilation systems and louvers.
Flashing and waterproofing details.

2.4. Connection system

Anchor bolts connecting columns to foundations.
High-strength bolts at structural frame joints.
Factory or site welding where required.
End plates, splice plates and column base plates.

2.5. Foundation system

Pad, strip or piled foundations.
Reinforced-concrete pedestals and steel base plates.
Anchor bolts, non-shrink grout and levelling plates.
Foundation beams, tie beams and industrial floors.

2.6. Related process systems

Overhead cranes and crane runway rails.
Piping, cable trays and MEP equipment.
Machinery supports and suspended loads.
Lightning protection and grounding systems.

Pre-engineered steel building components including roof sheet, purlin, rafter, column, base plate, anchor bolt and foundation — **Pre-Engineered Building components:** Roof Sheet → Purlin → Rafter → Column → Base Plate → Anchor Bolt → Foundation.

3. Common types of steel buildings

Manufacturing facilities

Large-span spaces integrating overhead cranes, process equipment, ventilation, lighting and mechanical and electrical systems.

Logistics warehouses

Designed to optimise storage space, forklift circulation, clear height, fire safety and future expansion.

Crane buildings

Require careful control of dynamic loading, lateral forces, crane-beam deflection, rails, connections and crane duty class.

Multi-span steel buildings

Use multiple column lines or continuous frames to accommodate wide production areas and large building footprints.

Canopies and auxiliary structures

Canopies, platforms, stairs, walkways, equipment supports, pipe racks and technical buildings.

Renovation and expansion projects

Existing-frame strengthening, roof raising, span extensions, crane additions and changes in operating loads or building use.

4. Why are steel structures widely used?

Benefit	Technical meaning	Value for the owner
Large clear spans	Steel has a high strength-to-weight ratio and is suitable for spaces with fewer internal columns.	Improves production-line layout, logistics flow and equipment arrangement.
Rapid construction	Factory fabrication may proceed in parallel with foundation construction.	Reduces the time required to place the building into operation.
Quality control	Materials, dimensions, welding and coating can be inspected at each stage.	Reduces rework, disputes and acceptance risks.
Lower self-weight	Steel systems often weigh less than many conventional structural alternatives.	May optimise foundation dimensions and reduce ground pressure.
Future expansion	Steel frames are convenient to extend, raise or adapt to operational changes.	Supports the long-term development of factories and warehouses.
Reuse and recycling	Many members may be dismantled, replaced, reused or recycled.	Supports more efficient use of resources.

A steel-building solution should not be assessed solely on the price per kilogram of steel. Structural loads, foundations, cladding, construction, operation, maintenance, service life and expansion potential must all be considered.

5. Steel structure design, fabrication and erection process

Survey and requirement definition

Clarify the layout, building use, span, height, crane requirements, geotechnical conditions, production technology and expansion plans.

Concept design

Establish the structural arrangement, frame spacing, bracing system, materials, loads and cladding concept.

Structural design

Analyse loads, internal forces and global stability, verify members and design structural connections.

Shop drawings

Develop fabrication dimensions, connection plates, bolt holes, weld symbols, member marks and tolerances.

Factory fabrication

Cutting, drilling, fit-up, welding, straightening, dimensional inspection and member completion.

Surface treatment

Cleaning, protective coating, finishing paint or galvanising, depending on the service environment and project requirements.

Transportation and site delivery

Divide delivery lots, protect coatings, plan loading sequences and organise unloading and storage at the site.

Erection

Install columns, rafters, bracing, purlins and cladding while controlling temporary stability, grid lines, levels and connections.

Inspection and acceptance

Inspect geometry, bolts, welds, protective coatings, cladding systems and quality records.

Handover and maintenance

Complete as-built documentation, acceptance records, operational guidance and periodic inspection plans.

Steel structure and pre-engineered building design fabrication and erection process — **Steel structure process:** Project → Survey → Concept Design → Structural Design → Shop Drawing → Fabrication → Surface Treatment → Delivery → Erection → Inspection → Handover → Maintenance.

Overall steel structure project process from design and fabrication to erection and maintenance — **Integrated value chain:** Design, production, quality control, transportation, erection, acceptance and maintenance must be managed as one coordinated system.

6. Shop drawings – the bridge between engineering and production

Shop drawings are the documents directly used for fabrication and erection. A small drawing error may result in incorrect bolt holes, incorrect connection plates, incorrect member lengths or members that cannot be assembled on site.

Information to be shown

Member identification and erection location.
Overall dimensions and fabrication dimensions.
Connection plates, stiffeners and bolt holes.
Weld symbols, lengths and weld sizes.
Material grades, bolt classes and surface requirements.
Fabrication and erection tolerances.

Interfaces to be coordinated

Architecture, reinforced-concrete structures and floor levels.
Anchor bolts and foundation pedestals.
Overhead cranes, process equipment and suspended loads.
MEP systems, piping, cable trays and fire-protection systems.
Doors, rolling shutters, canopies and ventilation systems.
Transportation, lifting and erection methods.

Fabrication drawings must not be released until technical review, interface coordination and the required approval process have been completed.

7. Factory fabrication of steel structures

Material inspection

Verify section size, steel grade, thickness, material certificates, batch identification and surface condition before production.

Cutting and drilling

Control dimensions, cut quality, hole positions, squareness and prepared-edge quality.

Member fit-up

Check centrelines, flange and web dimensions, straightness, squareness and connection-plate positions before welding.

Welding

Apply suitable welding procedures and control consumables, parameters, welding sequence and heat-related distortion.

Straightening

Inspect bow, twist and welding deformation and correct them through controlled methods.

Final fabrication inspection

Verify dimensions, quantities, member marks, weld quality and surface condition before coating.

8. Welding and bolted-connection control

Welding control

Approve welding procedures in accordance with project requirements.
Confirm welder qualifications and approved welding ranges.
Inspect joint preparation, root gaps, fit-up and preheat where required.
Perform visual inspection and NDT at the specified level.
Repair defects through an approved repair procedure.
Issue reports and maintain weld-location traceability.

Bolted-connection control

Correct bolt type, diameter, length and strength class.
Correct combination of bolt, nut and washer.
Faying surfaces suitable for the connection design.
Initial tightening and final tightening in the correct sequence.
Torque or tension control in accordance with project requirements.
Marking and inspection records for completed connections.

Bolts must not be used to force significantly misaligned members into position. The cause must be identified, whether it originates from fabrication, foundations, setting-out or the erection sequence.

9. Protective coating, galvanising and life-cycle cost

The surface-protection system must be selected according to the operating environment, required service life, maintenance accessibility and application conditions. The decision should not be based solely on the initial coating price.

Surface preparation

Remove oil, grease, rust, weld slag and contaminants.
Use mechanical cleaning or abrasive blasting as required.
Inspect surface cleanliness and profile.
Control the time between cleaning and coating.

Multi-coat systems

Anti-corrosion primer.
Intermediate coat for additional protective thickness.
Finish coat for weather resistance and colour.
Control individual and total dry-film thickness.

Galvanising

Suitable for external members and smaller components.
Bath dimensions and venting holes must be considered.
Thermal distortion must be addressed during member design.
Damaged galvanised areas must be repaired where necessary.

Typical environment	Characteristics	General solution direction
Dry internal environment	Low humidity and low corrosive exposure.	Basic coating system according to appearance and service-life requirements.
Industrial environment	Humidity, dust and industrial contaminants may be present.	Higher surface-preparation level and greater coating thickness.
External or coastal environment	High humidity, salt exposure and severe weathering.	High-performance coating or galvanising, depending on the member.
Chemical environment	Exposure to specific chemical vapours, gases or substances.	Separate assessment according to chemicals and operating conditions.

Corrosivity classification and the detailed coating system must be defined in the project design documents or technical specification.

10. QC/QA and Hold Points in steel structure projects

Quality is not inspected only at the end of the work. The QC/QA system must define inspection points, witness points, hold points and approval responsibilities before the next activity begins.

Stage	Main control point	Records or evidence
Design	Standards, loads, analytical model, connections and technical interfaces.	Design basis, calculations, drawing register and RFIs.
Shop drawings	Dimensions, plates, bolt holes, weld symbols and member identification.	Approved drawings, transmittals and revision register.
Materials	Dimensions, grade, certification and traceability.	MTCs, CO/CQ and incoming-material inspection records.
Fit-up	Assembly, root gaps, dimensions, centrelines and plate positions.	Fit-up inspection reports.
Welding	Procedures, personnel, visual quality and non-destructive testing.	WPS/PQR/WPQ, visual reports and NDT reports.
Coating or galvanising	Surface preparation, environmental conditions and coating thickness.	Surface-preparation and DFT reports.
Erection	Grid lines, levels, verticality, temporary bracing and bolted connections.	Survey reports, torque records and erection checklists.
Handover	As-built documentation, outstanding items, quality records and maintenance guidance.	As-built drawings, punch lists and handover dossier.

Steel structure fabrication and erection quality Hold Point process — **Steel structure Hold Points:** Material Inspection → HP1 → Fit-up → HP2 → Welding → HP3 → Painting → HP4 → Delivery → HP5 → Erection → HP6 → Acceptance.

Steel structure quality control workflow from incoming material to final acceptance — **QC Workflow:** Continuous quality control from incoming materials through fabrication, coating, transportation, erection and final acceptance.

11. Steel erection at the construction site

Preparation activities

Inspect the work area, access roads and crane positions.
Verify grid lines, elevations and anchor bolts.
Prepare the erection sequence and temporary-stability plan.
Determine crane capacity, radius and configuration.
Arrange storage zones and ground-assembly areas.

Erection control

Erect columns and stabilise them with temporary bracing.
Install rafters in sections or preassemble them at ground level.
Install sufficient bracing before releasing lifting equipment.
Verify grid lines, levels and verticality.
Complete final bolt tightening after frame alignment.

The erection sequence must maintain structural stability during every temporary condition, not only after the complete building has been assembled.

12. HSE safety during steel erection

Lifting operations

Lifting plans and load verification.
Suitable cranes, slings and lifting accessories.
Qualified lifting supervisors and standard signals.
Exclusion zones beneath suspended loads.

Work at height

Suitable platforms, access equipment or scaffolding.
Full-body harnesses and controlled anchorage points.
Rescue arrangements for suspended workers.
Dropped-object and hand-tool control.

Weather conditions

Monitor wind, rain and lightning.
Stop lifting when safe operating limits are exceeded.
Do not work on wet or slippery roof surfaces.
Maintain drainage and safe access routes.

Hot work and fire risk

Hot-work permits.
Protection from sparks and combustible materials.
Fire extinguishers and fire-watch personnel.
Post-work inspection of the area.

Electrical equipment

Proper grounding and electrical protection.
Cables protected from water and physical damage.
Inspection of welding machines, grinders and leads.
Energy isolation where required.

Work management

JSA before work begins.
Toolbox meetings for each shift.
Verification of personnel and equipment competency.
Continuous site supervision.

No JSA – no required permit – unsafe working conditions: no work shall commence.

13. Common problems in steel structure projects

Design and coordination problems

Process loads or crane loads are not finalised.
Insufficient coordination between foundations, structure, architecture and MEP.
Connections are difficult to fabricate or erect.
Transportation and lifting limitations are not considered.

Foundation and anchor-bolt problems

Incorrect grid lines, elevations or anchor-bolt spacing.
Inclined anchor bolts, insufficient threads or damaged threads.
Base plates do not bear evenly on grout.
No foundation inspection before members arrive on site.

Fabrication problems

Incorrect length, hole location or connection plate.
Members are bent, twisted or distorted by welding.
Material traceability is unavailable.
Member marks do not match erection drawings.

Welding and bolting problems

Incorrect weld size or unacceptable welding defects.
Wrong bolt, nut or washer type.
Bolts tightened before frame alignment.
Missing inspection and tightening records.

Coating problems

Surface not properly cleaned of oil, rust or weld slag.
Insufficient or uneven dry-film thickness.
Coating applied under unsuitable humidity conditions.
Coating damaged during transportation or erection.

Erection problems

Insufficient temporary bracing or premature crane release.
Grid lines, levels and verticality are not checked.
Members are installed in the wrong position or direction.
Cladding begins before frame geometry is completed.

Most site rework costs originate from an inspection step that was previously omitted. Detecting an error on a drawing is always less expensive than discovering it after the member has been fabricated.

14. Applicable technical standards

Applicable standards must be identified in the contract, design basis, specification and design documentation of each project. Different standard systems should not be mixed without a clearly defined hierarchy.

Vietnamese standards

Standards for structural-steel design.
Standards for loads and actions.
Standards for fabrication, assembly and acceptance.
Standards for materials, welding and corrosion protection.
Fire-safety codes and project-specific regulations.

International standards

AISC, ASCE and IBC where specified.
AWS standards for structural-steel welding.
Eurocodes and EN standards for design and execution.
ISO or project specifications for corrosion protection.
Owner or process-technology supplier requirements.

The list of standards, applicable editions and order of precedence should be agreed at the beginning of the project to avoid disputes during acceptance.

15. Acceptance and handover documentation

Site inspection

Frame grid lines, levels and verticality.
Condition of bolted connections and site welds.
Completion of bracing, purlins and cladding.
Roof, gutter and drainage watertightness.
Condition of protective coating after erection.
Completion of punch-list items before handover.

Quality dossier

Approved design and shop drawings.
Material certificates and incoming-inspection records.
Welding, NDT, coating and bolt records.
Fabrication and erection inspection records.
As-built drawings and approved changes.
Inspection, operation and maintenance guidance.

16. Life-cycle maintenance of steel structures

Steel structures should be inspected periodically even when no obvious damage is visible. The objective is to identify corrosion, water leakage, loose bolts, deformation, weld cracking or changes in operational loading at an early stage.

Periodic inspection

Abnormal deformation or deflection.
Corrosion at column bases and water-trapping areas.
Condition of bolts, plates and welds.
Roof, gutter and cladding leakage.

Preventive maintenance

Clean areas where dust and moisture accumulate.
Repair scratched or deteriorated coatings.
Replace degraded sheets, fasteners and seals.
Control corrosion sources within the factory environment.

Assessment following operational changes

Installation of new machinery or suspended loads.
Crane upgrading or higher crane duty.
Installation of solar panels or roof equipment.
Building expansion or removal of existing members.

Steel structure life cycle from design and fabrication to maintenance expansion and demolition — **Steel structure life cycle:** Design → Fabrication → Construction → Operation → Maintenance → Repair → Expansion → Demolition.

17. Factors affecting steel structure cost

Building geometry

Span, height, frame spacing, roof slope, number of floors and architectural complexity.

Design loads

Wind, seismic loading, roof loads, cranes, equipment, suspended loads and process loads.

Applicable standards

Standard system, tolerance requirements, weld inspection, NDT and quality documentation.

Surface-protection system

Surface preparation, number of coats, total DFT, galvanising and service environment.

Construction conditions

Site access, lifting equipment, working height, weather and work within operating facilities.

Schedule and logistics

Delivery sequence, shift work, oversized transport, unloading and accelerated completion requirements.

For a meaningful quotation, the enquiry should include at least: layout plans, sections, intended use, principal loads, applicable standards, coating requirements, location and expected schedule.

18. Why work with INDUSVINA?

INDUSVINA approaches projects through responsibility, engineering discipline, safety, quality and long-term life-cycle value.

System-based thinking

We connect design, production, construction, MEP, operation and maintenance instead of managing them as isolated tasks.

Control from the beginning

Standards, loads, interfaces, Hold Points and acceptance criteria are clarified before fabrication begins.

Transparent quality

Quality is demonstrated through records, checklists, inspection reports and traceability.

Support after handover

Inspection, repair, strengthening, modification and MRO maintenance support during operation.

2013 Established

4 Core capabilities

QC/QA System-based quality control

HSE Safety as a mandatory condition

19. Conclusion

Correct design optimises materials and reduces interface conflicts.
Correct shop drawings support accurate fabrication and erection.
Correct fabrication reduces site rework.
Correct erection ensures structural stability and safety.
Correct QC/QA enables transparent acceptance and traceability.
Correct maintenance extends service life and reduces life-cycle cost.

A steel structure is not simply the quantity of steel installed in a building. It is the result of a technical system controlled from the initial requirements throughout the entire operating life.

INDUSVINA steel structure design fabrication erection inspection and maintenance capability — **Steel Structures & PEB:** Design – Fabrication – QC/QA – Delivery – Erection – Acceptance – Life-cycle Maintenance.

FAQ – Steel Structures and Pre-Engineered Buildings

What types of projects are suitable for Pre-Engineered Buildings?

PEB systems are suitable for factories, warehouses, logistics centres, showrooms, parking buildings, sports facilities and other projects requiring large clear spans, rapid implementation and future expansion.

Are steel structures more durable than reinforced-concrete structures?

No general conclusion can be made based solely on the structural material. Durability depends on design, environment, corrosion protection, construction quality and maintenance. Each solution has its own suitable applications.

Why must shop drawings be approved before fabrication?

Shop drawings directly define dimensions, plates,