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- Notched top edge on bearing bars
- Same sizes and meshes as plain grating
- For wet, oily, icy and sloping floors
- Published load and deflection factors
Why serrated
Serrations are notches cut into the top edge of the bearing bars before they are welded into grating. The sharp edges grip shoe soles and reduce slipping where floors are wet, oily, greasy, icy or sloping – wash-down areas, offshore and port platforms, food plants, outdoor stairs and ramps. Specify S in the WS code, for example WS-G325/30/100-S-G.
Load and deflection factors
The notches reduce the effective depth of the bar. Multiply the plain-bar safe load by the load factor and the deflection by the deflection factor:
| WS bar | Bar (mm) | Load factor | Deflection factor |
|---|---|---|---|
| WS-G655 | 65 × 5 | 0.92 | 1.04 |
| WS-G555 | 55 × 5 | 0.90 | 1.05 |
| WS-G505 | 50 × 5 | 0.89 | 1.06 |
| WS-G455 | 45 × 5 | 0.88 | 1.07 |
| WS-G405 | 40 × 5 | 0.87 | 1.07 |
| WS-G403 | 40 × 3 | 0.87 | 1.07 |
| WS-G325 | 32 × 5 | 0.83 | 1.09 |
| WS-G323 | 32 × 3 | 0.83 | 1.09 |
| WS-G255 | 25 × 5 | 0.79 | 1.12 |
| WS-G253 | 25 × 3 | 0.79 | 1.12 |
20 × 5 mm serrated bars at 60 mm pitch are not recommended. Slip resistance is classified to AS 4586 or DIN 51130 by test where a rating is specified.
市場別の規格と要求事項
World Steelが本製品の設計・製作・書類作成に適用する基準――および各市場における主な寸法・荷重要件。
米国
- ANSI/NAAMM MBG 531Metal Bar Grating Manual
- ASCE 7Minimum design loads (Table 4.3-1 floor live loads)
- OSHA 29 CFR 1910 Subpart DWalking-working surfaces
- AWS D1.1Structural welding code – steel
- ASTM A123Zinc (hot-dip galvanized) coatings on iron and steel products
- CSI 05 53 00Metal gratings (MasterFormat section)
- Light manufacturing / light storage live load
- 125 psf (ASCE 7 Table 4.3-1)
- Heavy manufacturing / heavy storage live load
- 250 psf (ASCE 7 Table 4.3-1)
- Toeboard at open edges
- ≥ 3.5 in (90 mm) high (OSHA 1910.29(k))
豪州 / NZ
- AS 1657-2018Fixed platforms, walkways, stairways and ladders
- AS/NZS 1170.1Structural design actions – imposed actions
- AS 4100Steel structures
- AS/NZS 1554.1Structural steel welding
- AS/NZS 4680Hot-dip galvanized coatings on fabricated ferrous articles
- AS 4586Slip resistance classification of pedestrian surfaces
- Walkway clear width
- ≥ 600 mm (AS 1657)
- Toeboard
- ≥ 100 mm where required (AS 1657)
欧州
- DIN 24537-1Gratings as floor covering – steel gratings
- RAL-GZ 638Gratings – quality assurance
- EN ISO 14122-2Working platforms and walkways
- EN 1991-1-1Imposed loads on buildings
- EN ISO 1461Hot-dip galvanized coatings on fabricated articles
- Walkway clear width
- ≥ 600 mm, preferably 800 mm (EN ISO 14122-2)
- Toe-plate
- ≥ 100 mm high (EN ISO 14122-3)
参考用の概要です――プロジェクト仕様書、採用される基準の版、所轄官庁の判断が優先されます。
表面処理
| 表面処理 | 規格 / 備考 |
|---|---|
| Hot-dip galvanised (G) | ASTM A123 · AS/NZS 4680 · EN ISO 1461 |
| Paint coated (PP) | Blast or pickle + paint system to ISO 12944 / AS/NZS 2312.1 / SSPC |
| Untreated (U) | Black steel for painting or galvanising by others |
| Duplex | Galvanised + paint for colour or C5 environments |
よくある質問
Is serrated grating weaker?
Slightly – the notches reduce the effective depth. Load factors are 0.79–0.92 depending on the bar, so a deeper bar may be needed for the same span.
Where should serrated grating be used?
Wet, oily, icy, sloping or outdoor floors and stairs where slip resistance matters more than a smooth surface.
AS/NZS 5131 CC3
EN 1090 EXC3 · CE
