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R = 8 · q up to 5αu/α1
Special moment frames (SMF)
Open bays and maximum architectural freedom. Plastic hinges form in reduced beam sections (RBS) or other prequalified connections; column panel zones get continuity and doubler plates.
Solution · Steel for high-seismic regions
Steel structures built for earthquake country
Special moment frames, braced frames and eccentrically braced frames fabricated for high-seismic regions – capacity-designed details, demand-critical welds, controlled materials and full traceability, to AISC 341, EN 1998, NZS 3404 and the codes of your market.
- SDC D–F
- US seismic design categories
- DCM · DCH
- Eurocode 8 ductility classes
- 100 %
- UT of CJP demand-critical welds where the specification requires
- EXC3 · CC3
- Certified fabrication
Ductility is fabricated, not just designed
In a strong earthquake a steel building survives because selected elements – beam hinges, braces or links – yield again and again while the rest of the frame stays elastic. Whether that happens depends as much on the fabricator as on the engineer: on the right steel with the right toughness, on weld access holes cut to the specified geometry, backing bars removed and back-gouged, protected zones left untouched and every critical weld tested.
World Steel fabricates seismic force-resisting systems for projects in seismically active markets. We work to the engineer of record's drawings and the project specification, apply the fabrication and quality requirements of AISC 341 and AWS D1.8, EN 1998 and EN 1090-2 or NZS 3404 and AS/NZS 5131, and deliver a quality dossier that supports the owner's quality assurance and special inspection.
Seismic systems
Seismic force-resisting systems we fabricate
Each system dissipates energy in a different element – our shop process is set up for the critical details of each one.
R = 8 · q up to 5αu/α1
R = 6
Special concentric braced frames (SCBF)
Stiff and economical. Braces yield in tension and buckle in compression; gusset plates are detailed for brace end rotation and the expected brace strength.
R = 8
Eccentrically braced frames (EBF)
Stiffness of a braced frame with the ductility of a moment frame – a short, fully stiffened link yields in shear while braces and columns stay elastic.
AISC 358
Prequalified moment connections
RBS, welded unreinforced flange (WUF-W), bolted end plates and bolted flange plates – fabricated with demand-critical CJP welds and documented protected zones.
Ứng dụng
Where seismic steel matters
01
Offices & mixed use
Moment-frame perimeters and braced cores in mid-rise buildings.
02
Hospitals & schools
Essential and high-occupancy buildings with higher importance factors.
03
Industrial plants
Process structures, pipe racks and equipment supports to industrial seismic codes.
04
Mining & energy
Conveyor galleries, transfer towers and plant buildings in the Andes and Pacific Rim.
05
Warehouses & logistics
High-bay buildings and racks where seismic mass is large.
06
Airports & transport
Long-span roofs, terminals and pedestrian bridges in seismic zones.
Tiêu chuẩn & tuân thủ
Seismic codes by market
The engineer of record selects the system and code; we fabricate and document to it. Key references:
United States
- ASCE 7Seismic design categories; AISC 341 governs SFRS in SDC D, E and F (and where R > 3)
- AISC 341Seismic provisions for structural steel buildings
- AISC 358Prequalified connections for SMF and IMF
- AWS D1.8Structural welding code – seismic supplement
- AWS D1.1Structural welding code – steel
- Material
- Expected yield Ry: A992 and A572 Gr 50 = 1.1, A36 = 1.5; Fy ≤ 50 ksi for most yielding members
- Demand-critical welds
- Filler metal with CVN ≥ 20 ft·lbf at 0 °F (classification) and ≥ 40 ft·lbf at 70 °F (heat-input testing)
- Bolts
- Pretensioned high-strength bolts, faying surfaces at least Class A
- Inspection
- AISC 341 Chapter J QC / QA; IBC Chapter 17 special inspection
New Zealand / Australia
- NZS 1170.5Earthquake actions – New Zealand
- NZS 3404Steel structures – ductility categories (fully, limited, nominally ductile, elastic)
- AS 1170.4Earthquake actions in Australia – earthquake design categories
- AS 4100Steel structures – Section 13 earthquake design
- AS/NZS 5131 WSC được chứng nhậnFabrication and erection – construction category CC3 typical for seismic frames
- Welding
- AS/NZS 1554.1 SP category for critical welds, with the NDT the designer specifies
- NZ market
- Many NZ clients require a fabricator certified under the SFC scheme – confirm per project
Europe
- EN 1998-1Design of structures for earthquake resistance – Section 6 steel buildings
- EN 1993-1-8Design of joints
- EN 1090-2 WSC được chứng nhậnExecution – EXC3 commonly specified for dissipative structures
- EN ISO 3834-2Comprehensive welding quality requirements
- Ductility classes
- DCL (q ≤ 1.5 recommended), DCM and DCH
- Overstrength
- γov = 1.25 recommended; actual fy,max ≤ 1.1 γov fy for dissipative zones
- Conformity
- CE marking – World Steel FPC certificate 2797 CPR 827443 (EXC3)
Other seismic markets
- NCh 433 / NCh 2369Chile – buildings and industrial structures
- E.030Peru – earthquake-resistant design
- NSCP 2015Philippines – national structural code
- SNI 1726 / SNI 7860Indonesia – seismic actions and steel seismic provisions
- TBDY 2018Turkey – building earthquake code
- TCVN 9386Vietnam – design of structures for earthquake resistance
World Steel does not hold AISC Certified Fabricator status – US projects are fabricated to the project's AISC 341 / AWS D1.8 requirements with third-party special inspection as required by IBC Chapter 17.
Nội dung chỉ mang tính tham khảo – chỉ dẫn kỹ thuật của dự án, phiên bản quy chuẩn được áp dụng và cơ quan có thẩm quyền là căn cứ quyết định.
Kỹ thuật
Capacity design: protect everything except the fuse
Every seismic system has a deliberate weak link. In a moment frame it is the beam hinge, in a braced frame the brace, in an EBF the link. Columns, connections and gussets are designed for the expected strength of that fuse – Ry·Fy, not the nominal yield.
That is why we control material grades and mill certificates, avoid uncontrolled substitutions with stronger steel, and identify yielding members on the drawings, in the shop and on the delivery documents.
Kỹ thuật
The details that decide performance
Reduced beam sections are CNC-cut to the a, b, c geometry of AISC 358 and ground smooth. Weld access holes follow the specified profile; bottom-flange backing is removed, back-gouged and reinforced with a fillet weld; weld tabs are removed and ends ground.
Protected zones are marked on shop drawings and on the steel – no shear studs, shot pins, welded attachments or erection aids there. Complete-joint-penetration welds are ultrasonically tested and recorded.
Kỹ thuật
A quality chain built for seismic work
Welding procedures are qualified for the toughness the project requires, welders are qualified for the joints they make, and each demand-critical weld is traceable to welder, procedure, consumable and NDT report.
Our welding quality system is certified to EN ISO 3834-2; our fabrication certificates EN 1090 EXC3 and AS/NZS 5131 CC3 cover the highest execution classes normally specified for seismic frames.
Thông số
What we supply
- Moment frames
- Columns with continuity and doubler plates, RBS or end-plate beams, column splices, base plates
- Braced frames
- HSS or wide-flange braces, gusset plates with clearance for rotation, chevron beams, collector and chord members
- EBF links
- Links with full-depth stiffeners, link-to-column connections, lateral bracing at link ends
- BRBF
- Frames and gussets fabricated by World Steel; buckling-restrained braces supplied by qualified specialist manufacturers
- Materials
- ASTM A992 / A572 Gr 50, EN 10025 S355 J2/K2, AS/NZS 3679 / 3678 Gr 350 L0 – with 3.1 certificates and CVN where specified
- Documentation
- WPS / PQR, welder records, UT / MT reports, protected-zone marking, material traceability, QC records for the owner's QA
Quy trình
How we deliver seismic steel
- 1
Specification review
Code, system, SDC or ductility class, toughness, NDT and inspection requirements.
- 2
Shop drawings
RBS geometry, access holes, protected zones and demand-critical welds identified.
- 3
Procedures & materials
Seismic WPS / PQR, consumables and steel with the required properties.
- 4
Fabrication
CNC cutting, controlled welding, back-gouging and grinding of critical details.
- 5
Testing
UT of CJP welds, MT where required, dimensional checks and trial fit-up.
- 6
Dossier & delivery
Traceable QC records for special inspection, marked and sequenced deliveries.
FAQ
Câu hỏi thường gặp
Which seismic systems can World Steel fabricate?
Special, intermediate and ordinary moment frames, special and ordinary concentric braced frames, eccentrically braced frames and the steel frames of buckling-restrained braced frames – to AISC 341, EN 1998, NZS 3404 / AS 4100 or the code in your specification.
Is World Steel an AISC Certified Fabricator?
No. World Steel holds EN 1090 EXC3, AS/NZS 5131 CC3, EN ISO 3834-2, and IAS AC472 certification. For US projects we fabricate to the AISC 341 and AWS D1.8 requirements of the project specification, with quality assurance and special inspection as required by IBC Chapter 17 and the building official.
What is a demand-critical weld?
A weld identified by AISC 341 whose failure would compromise the seismic system – for example the complete-joint-penetration beam-flange-to-column welds of a moment frame. They require filler metal with specified toughness, qualified procedures and, typically, 100 % ultrasonic testing.
What is a protected zone?
The region of a member that is expected to yield, such as the reduced beam section of an SMF beam or an EBF link. Welded attachments, shear studs, shot pins and other discontinuities are not allowed there; we mark these zones on drawings and on the steel.
Can you supply buckling-restrained braces?
BRB cores and casings are proprietary products qualified by testing. We fabricate the frames, gussets and connections and coordinate the braces from a qualified specialist manufacturer named or approved by the engineer of record.
Do you supply industrial structures in Chile and Peru?
Yes. Mining and industrial structures are fabricated to the owner's specification and the applicable seismic codes such as NCh 2369 in Chile and E.030 in Peru, with the fabrication and NDT requirements of the project.
Nội dung liên quan
Peru
Philippines
Indonesia
Turkey
MexicoTiêu chuẩn & chứng nhận
EN 1090 EXC3 · CE
AS/NZS 5131 CC3
IAS AC472United StatesEurope
Australia & New Zealand
EN 1090 EXC3 · CEAS/NZS 5131 CC3IAS AC472United StatesEuropeAustralia & New Zealand
Building in a high-seismic region?
Send us the drawings, the seismic system and the specification – we return a fabrication review, a quality plan and a delivered price.
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