Publish Time: 2024-12-12 Origin: Site
01 Column Distance
For frequently-used portal frame structure, it is recommended that the column distance should be within the range of 7~9m;
When there is no crane or the crane is small tonnage, the column distance can be 8~9m;
If the crane tonnage is large, the column spacing can be about 7m.
The use of reasonable and economical column spacing can save 3%~5% and the total price can save 2%~6%, which is very economical.
After statistics and calculations of a large number of engineering projects, it can be found that when the column spacing is 7~9m, the total steel consumption remains basically stable. When it is less than 7m, the total steel quantity generally decreases with the increase of column spacing, and the decrease increases with the increase of span.
When the column spacing exceeds 9m, the total steel consumption increases due to the sharp increase in the steel consumption of components such as purlins, bracing system and crane beams
02 Span
The economic span of portal frames is generally 18~36m.
When the crane tonnage is large, the economic span is 24m~36m; when there is no crane or the crane tonnage is small, the economic span is 18~24m; adopting a reasonable economic span can save 5%~15% of steel and reduce the total cost by 2%~7%.
03 Steel Grade
Main steel frame design is controlled by strength, Q355 is used; when it is controlled by stability, Q235 is used.
04 Secondary Structure
Purlins can use continuous Z purlins instead of traditional simply supported C-type purlins.
| Steel Quantity of Portal Frame Comparison Among Different Span, Column Distance and Steel Grade Without Crane | ||||||
| Steel Grade | Span (m) | Column Distance | Steel Frame Comsuption(kg/sqm) | Secondary Structure Quantity(kg/sqm) | Total Steel Quantity(kg/sqm) | |
| Roof Purlin | Other Bracing | |||||
| Q235 | 12 | 6 | 14.2 | 3.5 | 3.7 | 21.4 |
| 7.5 | 14.6 | 4 | 22.3 | |||
| 9 | 15.5 | 4.2 | 23.4 | |||
| 18 | 6 | 13.3 | 3.5 | 3.6 | 20.4 | |
| 7.5 | 13 | 4 | 20.6 | |||
| 9 | 13.5 | 4.2 | 21.3 | |||
| 24 | 6 | 17.4 | 3.5 | 3.6 | 24.5 | |
| 7.5 | 16.1 | 4 | 23.7 | |||
| 9 | 16.8 | 4.2 | 24.6 | |||
| 30 | 6 | 19.5 | 3.5 | 3.4 | 26.4 | |
| 7.5 | 20.1 | 4 | 27.5 | |||
| 9 | 21.9 | 4.2 | 29.5 | |||
| 1. Calculated by single span and 6m eave height. 2. Dead load is 0.25KN/sqm, Live load is 0.5KN/sqm, Wind load is 0.5KN/sqm. 3. Column foot is hinged connection. 4. Main steel frame is Q355, secondary structure is Q235. 5. Partial Safety Factor For Load. 6. Bearing Load is more than 60sqm Live Load is calculated 0.3. | ||||||
| Steel Quantity of Portal Frame Comparison Among Different Span, Column Distance and Steel Grade | |||||||
| Steel Grade | Span (m) | Column Distance | Without Crane | 2*5Ton Cranes | |||
| Main Steel Structure | Secondary Structure | Main Steel Structure | Crane Beam | Secondary Structure | |||
| Q355 | 18 | 6 | 13.3 | 8.8 | 16.5 | 6.9 | 8.8 |
| 7.5 | 13 | 9.3 | 15.9 | 8 | 9.3 | ||
| 9 | 13.5 | 9.5 | 15.7 | 9.7 | 9.5 | ||
| 21 | 6 | 16.2 | 8.5 | 19.4 | 5 | 8.5 | |
| 7.5 | 15.3 | 9 | 18.1 | 6.1 | 9 | ||
| 9 | 16.7 | 9.2 | 19.7 | 7.3 | 9.2 | ||
| 24 | 6 | 17.4 | 8.2 | 19.8 | 4.8 | 8.2 | |
| 7.5 | 16.1 | 8.7 | 18.5 | 6 | 8.7 | ||
| 9 | 16.8 | 8.9 | 18.7 | 7.3 | 8.9 | ||
| 30 | 6 | 19.5 | 8.5 | 22.7 | 5 | 8.5 | |
| 7.5 | 20.1 | 9 | 22.9 | 6.1 | 9 | ||
| 9 | 21.9 | 9.2 | 24.9 | 7.3 | 9.2 | ||
| 1. Calculated by single span and 8m eave height. 2. Dead load is 0.25KN/sqm, Live load is 0.5KN/sqm, Wind load is 0.5KN/sqm. 3. Column foot is hinged connection. 4. Column, beam and crane beam are Q355, secondary structure is Q235. 5. Roof slope is 1/20. | |||||||
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