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- Recommended spans for 2.5, 3, 4, 5 and 7.5 kPa
- Safe loads U (kPa) and C (kN/m) for spans 600–2000 mm
- Deflection at the design load
- Nominal weights for every type
- Pitch 30, 40 and 60 mm tables
How to use the tables
- Choose the design load (UDL) for the area – 2.5 kPa maintenance platforms up to 7.5 kPa heavy equipment areas.
- Measure the clear span of the bearing bars between supports.
- Pick the lightest WS code whose recommended span is equal to or greater than the clear span, or whose safe load U at that span is at least the design load.
- Check concentrated loads C (kN per metre of panel width) and the deflection limit set by the designer.
- For serrated bars apply the serration factors.
Values are indicative for carbon steel grating (SS400 / A36), single simply-supported panels with banded ends, and are not a substitute for the project design. U = safe uniform load (kPa), C = safe concentrated line load across the panel (kN/m), D = deflection (mm).
Recommended spans – light and medium duty
| WS code | Bar (mm) | Pitch 30 | Pitch 40 | Pitch 60 |
|---|---|---|---|---|
| WS-G203 | 20 × 3 | 1190 / 1060 / 1060 | 1110 / 980 / 980 | 1000 / 890 / 890 |
| WS-G253 | 25 × 3 | 1410 / 1350 / 1250 | 1310 / 1250 / 1170 | 1180 / 1130 / 1050 |
| WS-G323 | 32 × 3 | 1700 / 1620 / 1510 | 1580 / 1510 / 1400 | 1430 / 1350 / 1270 |
| WS-G403 | 40 × 3 | 2010 / 1920 / 1780 | 1870 / 1780 / 1660 | 1690 / 1610 / 1500 |
| WS-G205 | 20 × 5 | 1350 / 1290 / 1200 | 1260 / 1200 / 1120 | 1140 / 1090 / 1010 |
| WS-G255 | 25 × 5 | 1600 / 1530 / 1420 | 1490 / 1420 / 1320 | 1350 / 1290 / 1200 |
| WS-G325 | 32 × 5 | 1930 / 1840 / 1710 | 1790 / 1710 / 1590 | 1620 / 1550 / 1440 |
| WS-G405 | 40 × 5 | 2280 / 2180 / 2030 | 2120 / 2030 / 1890 | 1920 / 1830 / 1700 |
Recommended spans – heavy duty
| WS code | Bar (mm) | Pitch 30 | Pitch 40 | Pitch 60 |
|---|---|---|---|---|
| WS-G255 | 25 × 5 | 1350 / 1220 | 1250 / 1130 | 1130 / 1020 |
| WS-G325 | 32 × 5 | 1620 / 1460 | 1510 / 1360 | 1360 / 1230 |
| WS-G405 | 40 × 5 | 1920 / 1730 | 1780 / 1610 | 1610 / 1460 |
| WS-G455 | 45 × 5 | 2090 / 1890 | 1950 / 1760 | 1760 / 1590 |
| WS-G505 | 50 × 5 | 2270 / 2050 | 2110 / 1910 | 1910 / 1720 |
| WS-G555 | 55 × 5 | 2440 / 2200 | 2270 / 2050 | 2050 / 1850 |
| WS-G655 | 65 × 5 | 2760 / 2490 | 2570 / 2320 | 2320 / 2100 |
| WS-G755 | 75 × 5 | 3080 / 2780 | 2860 / 2590 | 2590 / 2340 |
| WS-G756 | 75 × 6 | 3220 / 2910 | 3000 / 2710 | 2710 / 2440 |
5.0 kPa covers factories, workshops, motor rooms and trolley channels; 7.5 kPa heavy loading areas, boiler and heavy equipment areas.
Safe loads – bearing bars at 30 mm
| Type | Bar (mm) | kg/m² (/50 / /100) | U 600 | U 800 | U 1000 | U 1200 | U 1400 | C 1000 (kN/m) | D 1000 (mm) |
|---|---|---|---|---|---|---|---|---|---|
| WS-G655/30 | 65 × 5 | 103.4 / 100.4 | 443 | 249 | 159 | 110 | 81 | 79 | 2.65 |
| WS-G605/30 | 60 × 5 | 95.9 / 92.9 | 377 | 212 | 136 | 94 | 69 | 68 | 2.89 |
| WS-G555/30 | 55 × 5 | 88.4 / 85.4 | 317 | 178 | 114 | 79 | 58 | 57 | 3.14 |
| WS-G505/30 | 50 × 5 | 80.9 / 77.9 | 262 | 147 | 94 | 65 | 48 | 47 | 3.45 |
| WS-G503/30 | 50 × 3 | 52.6 / 49.6 | 157 | 88 | 56 | 39 | 28 | 28 | 3.43 |
| WS-G455/30 | 45 × 5 | 73.4 / 70.4 | 212 | 119 | 76 | 53 | 39 | 38 | 3.83 |
| WS-G405/30 | 40 × 5 | 65.9 / 62.9 | 167 | 94 | 60 | 41 | 30 | 30 | 4.31 |
| WS-G403/30 | 40 × 3 | 43.3 / 40.3 | 100 | 56 | 36 | 25 | 18 | 18 | 4.32 |
| WS-G355/30 | 35 × 5 | 58.4 / 55.4 | 128 | 72 | 46 | 32 | 23 | 23 | 4.94 |
| WS-G353/30 | 35 × 3 | 38.6 / 35.6 | 77 | 43 | 27 | 19 | 14 | 13 | 4.84 |
| WS-G325/30 | 32 × 5 | 53.9 / 50.9 | 107 | 60 | 38 | 26 | 19 | 19 | 5.35 |
| WS-G323/30 | 32 × 3 | 35.8 / 32.8 | 64 | 36 | 23 | 16 | 11 | 11 | 5.41 |
| WS-G255/30 | 25 × 5 | 43.4 / 40.4 | 65 | 36 | 23 | 16 | 12 | 11 | 6.82 |
| WS-G253/30 | 25 × 3 | 29.3 / 26.3 | 39 | 22 | 14 | 9 | – | 7 | 6.94 |
| WS-G205/30 | 20 × 5 | 36.0 / 33.0 | 41 | 23 | 15 | 10 | – | 7 | 8.73 |
| WS-G203/30 | 20 × 3 | 24.6 / 21.6 | 25 | 14 | 9 | – | – | 4 | 8.76 |
Safe loads – bearing bars at 40 mm
| Type | Bar (mm) | kg/m² (/50 / /100) | U 600 | U 800 | U 1000 | U 1200 | U 1400 | C 1000 (kN/m) |
|---|---|---|---|---|---|---|---|---|
| WS-G655/40 | 65 × 5 | 81.7 / 78.7 | 332 | 187 | 119 | 83 | 61 | 59 |
| WS-G605/40 | 60 × 5 | 75.9 / 72.9 | 283 | 159 | 102 | 70 | 52 | 51 |
| WS-G555/40 | 55 × 5 | 70.1 / 67.1 | 238 | 133 | 85 | 59 | 43 | 42 |
| WS-G505/40 | 50 × 5 | 64.2 / 61.2 | 196 | 110 | 70 | 49 | 36 | 35 |
| WS-G503/40 | 50 × 3 | 42.6 / 39.6 | 118 | 66 | 42 | 29 | 21 | 21 |
| WS-G455/40 | 45 × 5 | 58.4 / 55.4 | 159 | 89 | 57 | 39 | 29 | 28 |
| WS-G405/40 | 40 × 5 | 52.6 / 49.6 | 125 | 70 | 45 | 31 | 23 | 22 |
| WS-G403/40 | 40 × 3 | 35.3 / 32.3 | 75 | 42 | 27 | 18 | 13 | 13 |
| WS-G355/40 | 35 × 5 | 46.8 / 43.8 | 96 | 54 | 34 | 24 | 17 | 17 |
| WS-G353/40 | 35 × 3 | 31.6 / 28.6 | 57 | 32 | 20 | 14 | 10 | 10 |
| WS-G325/40 | 32 × 5 | 43.3 / 40.3 | 80 | 45 | 29 | 20 | 14 | 14 |
| WS-G323/40 | 32 × 3 | 29.4 / 26.4 | 48 | 27 | 17 | 12 | 8 | 8 |
| WS-G255/40 | 25 × 5 | 35.1 / 32.1 | 49 | 27 | 17 | 12 | 9 | 8 |
| WS-G253/40 | 25 × 3 | 24.3 / 21.3 | 29 | 16 | 10 | 7 | – | 5 |
| WS-G205/40 | 20 × 5 | 29.3 / 26.3 | 31 | 17 | 11 | 7 | – | 5 |
| WS-G203/40 | 20 × 3 | 20.6 / 17.6 | 18 | 10 | 6 | – | – | 3 |
Safe loads – bearing bars at 60 mm
| Type | Bar (mm) | kg/m² | U 600 | U 900 | U 1200 | U 1500 | U 1800 | U 2100 | U 2400 |
|---|---|---|---|---|---|---|---|---|---|
| WS-G655/60/50 | 65 × 5 | 53.9 | 214.3 | 95.0 | 53.2 | 33.9 | 23.4 | 17.1 | 13.0 |
| WS-G555/60/50 | 55 × 5 | 46.6 | 153.4 | 67.9 | 38.0 | 24.2 | 16.7 | 12.1 | 9.2 |
| WS-G505/60/50 | 50 × 5 | 42.9 | 126.7 | 56.1 | 31.4 | 20.0 | 13.7 | 10.0 | 7.6 |
| WS-G455/60/50 | 45 × 5 | 40.0 | 102.6 | 45.4 | 25.4 | 16.1 | 11.1 | 8.1 | 6.1 |
| WS-G405/60/50 | 40 × 5 | 35.5 | 81.0 | 35.8 | 20.0 | 12.7 | 8.7 | 6.3 | 4.8 |
| WS-G403/60/50 | 40 × 3 | 23.9 | 48.6 | 21.5 | 12.0 | 7.6 | 5.2 | 3.8 | 2.8 |
| WS-G325/60/50 | 32 × 5 | 29.7 | 51.8 | 22.9 | 12.8 | 8.1 | 5.5 | 4.0 | 3.0 |
| WS-G323/60/50 | 32 × 3 | 20.4 | 31.1 | 13.7 | 7.6 | 4.8 | 3.3 | 2.4 | 1.8 |
| WS-G255/60/50 | 25 × 5 | 27.5 | 31.6 | 13.9 | 7.7 | 4.9 | 3.3 | 2.4 | 1.8 |
| WS-G253/60/50 | 25 × 3 | 17.3 | 18.9 | 8.3 | 4.6 | 2.9 | 2.0 | 1.4 | 1.0 |
| WS-G205/60/50 | 20 × 5 | 21.0 | 20.2 | 8.9 | 4.9 | 3.1 | 2.1 | 1.5 | – |
Pitch 60 grating is used for light covers, screens and maintenance areas. 20 × 5 mm bars at 60 mm pitch are not recommended in serrated form.
Tiêu chuẩn và yêu cầu theo thị trường
Các quy chuẩn mà World Steel áp dụng để thiết kế, gia công và lập hồ sơ cho sản phẩm này – cùng các yêu cầu chính về hình học và tải trọng tại từng thị trường.
Hoa Kỳ
- 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))
Úc / 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)
Châu Âu
- 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)
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.
Hoàn thiện bề mặt
| Hoàn thiện bề mặt | Tiêu chuẩn / ghi chú |
|---|---|
| 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 |
Câu hỏi thường gặp
What do U, C and D mean?
U is the safe uniformly distributed load in kPa, C the safe concentrated load across the panel in kN per metre of width, and D the deflection in mm at that load.
Can I use the tables for design?
They are for selection and budgeting. The project designer confirms loads, spans, deflection limits and the code; our engineers can provide a calculation for the selected panels.
Why are pitch 40 types lighter but weaker?
Fewer bearing bars per metre of width – about 25 % less steel than pitch 30 for the same bar size – so the safe load drops in proportion.
AS/NZS 5131 CC3
EN 1090 EXC3 · CE