| Material: | Steel Structure |
|---|---|
| Size: | According to Customers′ Requirement |
| Color Reference: | Ral |
| Member of Engineering Team: | 20 |
| Quality Control: | Daily |
| Life Cycle: | 50 Years |
| Customization: |
|---|
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Audited Supplier | 1.Columns Columns in multi-storey steel frames are generally H sections, predominantly carrying axial load. When the stability of the structure is provided by cores, or discreet vertical bracing, the beams are generally designed as simply supported. The generally accepted design model is that nominally pinned connections produce nominal moments in the column, calculated by assuming that the beam |
| reaction is 100 mm from the face of the column. If the reactions on the opposite side of the column are equal, there is no net moment. Columns on the perimeter of the structure will have an applied moment, due to the connection being on one side only. The design of columns is covered in detail in Multi-storey steel buildings. Part 4: Detailed design[6]. For preliminary design, it is appropriate to base the choice of column section on axial load alone, but ensure that the column is only working at 90% of its capacity, to allow for the subsequent inclusion of the nominal moments. |
| Although small column sections may be preferred for architectural reasons, the practical issues of connections to the floor beams should be considered. It can be difficult and costly to provide connection into the minor axis of a very small column section. |
| For ease of construction, columns are usually erected in two, or sometimes three-storey sections (i.e. approximately 8 m to 12 m in length). Column sections are joined with splices, typically 300 mm to 600 mm above the floor level. |
| Figure 4.5 Typical splice details with bearing plate |
| If there are restrictions on space, it is possible to use countersunk bolts in the plates, or if the column sections have the same internal profile, to use internal cover plates and countersunk bolts, as shown in Figure 4.6. |
| Figure 4.8 Typical long span primary beams and shorter span secondary beams (span of slab is indicated) |
| Integrated beams are a special case in which beams span directly between columns and secondary beams are eliminated. These beams are generally used in square grids, as illustrated in Figure 4.9. The slab is supported by the bottom flange or extended bottom plate of the beam and may be in the form of a deep composite slab or a hollow core concrete slab. |
| Span (m) | ||||||||
| 6 | 8 | 10 | 13 | 16 | 20 | |||
| Reinforced concrete flat slab | ||||||||
| Integrated beams and deep composite slab | ||||||||
| Integrated beams with precast slabs | ||||||||
| Composite beams and slab | ||||||||
| Fabricated beams with web openings | ||||||||
| Cellular composite beams | ||||||||
| Composite trusses | ||||||||
| 4.5.3 Features of long span construction Long span beams have gained in popularity in the commercial building sector |
| because they offer the following benefits in design and construction: · Internal columns are eliminated, leading to more flexible and efficient use of internal space |
| Opinions | 1)We can supply all kinds of steel structures, steel building, metal building, modular house, steel frame for warehouse, workshop, garage etc, steel beams, other riveting and welding parts |
| 2)We can also make and develop new parts according to customers' drawings and detailed dimensions | |
| Specifications of materials |
1)Size: MOQ is 100m2, width X length X eave height, roof slope |
| 2)Type: Single slope, double slope, muti slope; Single span, double-span, Multi-span, single floor, double floors | |
| 3) Base: Cement and steel foundation bolts | |
| 4) Column and beam: Material Q345(S355JR)or Q235(S235JR) steel, all bolts connection! Straight cross-section or Variable cross-section | |
| 5) Bracing: X-type or V-type or other type bracing made from angle, round pipe, etc | |
| 6) C or z purlin: Size from C120~C320, Z100~Z200 | |
| 7) Roof and wall panel: Single colorfull corrugated steel sheet0.326~0.8mm thick,(1150mm wide), or sandwich panel with EPS, ROCK WOOL, PU etc insulation thickness around 50mm~100mm | |
| 8)Accessories: Semi-transparent skylight belts, Ventilators, down pipe, Glavanized gutter, etc | |
| 9)Surface: Two lays of Anti-rust Painting | |
| 10) Packing: Main steel frame without packing load in 40'OT, roof and wall panel load in 40'HQ | |
| Design Parameters | If you need we design for you, pls supply us the following parameter together with detail size |
| 1)Live load on roof(KN/M2) | |
| 2)Wind speed(KM/H) | |
| 3)Snow load (KG/M2) | |
| 4)Earthquake load if have 5) Demands for doors and windows |
|
| 6)Crane (if have) ,Crane span, crane lift height, max lift capacity, max wheel pressure and min wheelpressure! |
3)Butt-welding on construction site:we require all the grooves should be bevelled on the upper rafter/column when it comes to bolt connection for web plates(see illustration 3). For the scenario of welding on web plates, please refer to the illustration 4.3.3.2 Box column(groove on itself).See illustration 5
4. Welding groove form
Example: Shielded metal arch welding, complete joint penetration, butt welding, I shape groove, welding backing and single side weld would be marked MC-BI-BS1
| Mark | Welding method | Penetration type |
| MC | Shielded metal arch welding | CJP-complete joint penetration |
| MP | PJP-partial joint penetration | |
| GC | Shielded arch welding Self-shielded arc welding |
CJP-complete joint penetration |
| GP | PJP-partial joint penetration | |
| SC | Submerged arc welding | CJP-complete joint penetration |
| SP | PJP-partial joint penetration | |
| SL | Electroslag welding |
| Backing material type | Single/double side welding | ||
| Mark | Material | Mark | Single/double side welding |
| BS | Metal backing | 1 | Single side welding |
| BF | Other backing | 2 | Double side welding |
| Mark | Size of each part on groove |
| t | Thickness of welding plate(mm) |
| b | Groove root gap or gap between two members(mm) |
| h | Groove depth(mm) |
| p | Groove roof face(mm) |
| α | Groove angle(º) |
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