400×400 Built-Up Steel Column C2: S275, 32 mm Flanges, 12.4 m Shaft, 3,289 kg

English Version

Title: Built-Up Steel Column C2: S275, 400×400 Box, PL32×400 Flanges, 12,437 mm Shaft, 3,289.03 kg

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Overview

This is C2, a plate-built column detailed to Eurocode. Two 32 mm thick side plates, a 10 mm web, a 63 mm base plate, and a set of connection stiffeners make up the shaft. The bill of material reads in English; every plate is S275. One piece was fabricated, weighing 3,289.03 kg in total.

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Column Data (from Drawing)

 

Item	Value
Column mark	C2
Quantity	1 psc
Shaft length	12,437 mm
Section size	400×400 built-up (32 + 336 + 32; 200 + 200)
Main side plates	PL32×400, length 12,437 mm
Web	PL10×336, length 12,437 mm
Base plate	PL63×500×770 mm
Steel grade	S275 (EN 10025)
Total weight	3,289.03 kg
Section views	A-A 1:5; G-G, H-H, N-N 1:10

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Bill of Material (from Drawing, S275)

 

No.	Specification	Length (mm)	Qty	Unit (kg)	Total (kg)
A16	L180×65×6	110	1	1.24	1.24
P12	PL63×500	770	1	190.40	190.40
P56	PL20×195	336	4	10.25	41.01
P67	PL8×175	246	4	2.52	10.09
P81	PL6×59	174	1	0.38	0.38
P87	PL25×195	336	4	12.78	51.12
P92	PL10×470	550	1	20.29	20.29
P94	PL25×400	470	1	36.90	36.90
P95	PL12×195	550	2	10.07	20.13
P100	PL25×400	470	1	36.90	36.90
P134	PL10×336	12,437	1	328.04	328.04
P135	PL32×400	12,437	1	1,249.67	1,249.67
P148	PL8×130	288	2	2.35	4.69
P149	PL6×184	288	1	2.49	2.49
P151	PL8×130	283	1	2.31	2.31
P152	PL8×193	193	1	1.25	1.25
P153	PL8×100	188	2	1.18	2.36
P189	PL25×175	500	2	15.95	31.89
P191	PL32×400	12,437	1	1,249.67	1,249.67
P204	PL25×160	175	2	4.11	8.21
Total					3,289.03

Line items sum to 3,289.04 kg; the 0.01 kg difference is rounding in the drawing table.

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Member Roles

 

Part	Mark	Role
Side plate (pair)	P135 / P191 PL32×400×12,437	Main shaft sides, carry axial load and bending
Web	P134 PL10×336×12,437	Connects the two side plates, transfers shear
Base plate	P12 PL63×500×770	Column base, spreads load to the foundation
Connection plates	P56 PL20×195, P87 PL25×195, P95 PL12×195, P67 PL8×175	Top and beam-to-column connection zones
Stiffeners	P92, P94, P100, P189, P204	Local reinforcement at connections and base
Fittings	A16 angle, P81, P148, P149, P151, P152, P153	Edge plates and small connection pieces

Welds: 6 mm fillet typical, continuous where marked; 4 mm fillet at the small N-N detail; 3-side 20 mm weld at the base.

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How the Column Works

• Axial load runs down the shaft. The two 32 mm side plates carry most of the compression and tension; the 400×400 section gives both axes bending resistance.
• The web holds the sides together. P134 PL10×336 ties the plates and transfers shear between them; diaphragms and stiffeners stop thin plates from buckling locally.
• The base plate spreads the reaction. P12 at 63 mm thick and 500×770 mm transfers the column reaction into the foundation anchor bolts.
• Connection zones are reinforced. 25 and 32 mm plates at the top and side positions back the bolt groups where the beam frames in.
• S275 is the delivery grade. All members are S275 to EN 10025; the English BOM and section labels follow Eurocode practice for export steelwork.

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Advantages

1. Built to a 400×400 square section — equal stiffness in both axes; no weak direction to orient on site.
2. Thick side plates (32 mm) — high local resistance at bolted connections; fewer stiffeners needed in heavily loaded zones.
3. Eurocode S275 — matches European tenders and export documentation; mill certificates to EN 10025 apply.
4. Plate-built, adaptable — section and plate thickness can be adjusted per load without buying a special rolled column.
5. Reinforced base and top — the 63 mm base plate and layered connection plates take anchor and beam reactions directly.

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Disadvantages / Limitations

1. Welding volume is heavy — two long sides, web, diaphragms, and every stiffener are welded straight; distortion and straightness need control.
2. Fabrication cost per tonne — plate cutting, fitting, and welding cost more than a standard rolled H or box column.
3. Closed corners are hard to inspect — where the section is boxed, interior welds and coating must be done before closing; after assembly they are unreachable.
4. Thin web needs stiffening — the 10 mm web over 336 mm depth relies on the diaphragms; spacing must match the drawing.
5. S275 substitution risk — a domestic grade cannot be swapped in without design approval; export jobs check the mill certificate against the spec.

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Typical Use Cases

1. Export frame columns — steelwork detailed to Eurocode with an English BOM.
2. Portal-frame and industrial building columns — 12 m-scale members carrying roof and crane loads.
3. Multi-storey steel frame columns — where a square built section suits both axes.
4. Heavy-duty support columns — machine bases, gantry legs, and equipment supports with large reactions.
5. Retrofit replacement columns — plate-built to match an existing bolt pattern and base.

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Fabrication and Erection Notes

• Material: S275 to EN 10025; check mill certificate before cutting.
• Shaft: pair P135 and P191 PL32×400 with the P134 PL10×336 web; mark the 12,437 mm length and panel points from the A-A elevation.
• Section: verify 32 + 336 + 32 = 400 mm width and the 200 + 200 = 400 mm depth; check squareness along the full shaft.
• Weld: 6 mm typical fillet, continuous where marked; 4 mm at N-N; 3-side 20 mm weld at the base; balance the two side seams to limit twist.
• Stiffeners: fit P92/P94/P100/P189/P204 at the marked zones; weld both sides where required.
• Base: set P12 on the foundation, match anchor bolts, check plumb before the first beam is fixed.
• Finish: seal any closed cavity; coat exterior per the project corrosion requirement.

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Bottom Line

One S275 built-up column, 400×400, 12,437 mm shaft, 3,289.03 kg. Two PL32×400 sides, a PL10×336 web, a 63 mm base plate, and reinforced connection zones. The square section resists load in both directions; the plate-built detail comes down to weld balance, section squareness, and a valid EN 10025 certificate.

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