EnglishViews: 0 Author: Site Editor Publish Time: 2024-09-16 Origin: Site
1. Layout Design
Steel Structure | Concrete Construction |
Large span structure, but solid belly steel beam can generally do about 20m | About 10m, if using prestressed concrete beam, it can do about 25m large span |
2. Common Structure Form
Steel Structure | Concrete Construction |
Pure frame structure or a supported frame structure | Pure frame structure or a frame structure with a shear wall |
The above comparison has a precondition: the common multi-high-level. In Japan steel structure is more common pure frame, so the steel column often uses square steel pipe. In USA steel structure is more common and supported frame structure, so the steel column often uses H-type steel.
3. Column Size
Steel Structure | Concrete Construction |
Column width (e. g.: 40cm) + fire protection layer + finishing material | Column width (e. g. 70cm) + finishing material |
The strength of steel is high, the material performance is uniform, and the section size can be made smaller. For example, in the three-story office building, the width of the steel column is 40cm, and if it is replaced by reinforced concrete, the width of the column will increase a lot, at least 65cm.
4. Beam Height
Steel Structure | Concrete Construction |
1 / 18~1 / 24 of the span, to pay special attention to the deflection, for a large span, to pay attention to the degree of comfort | From 1 / 10 to 1 / 18 of the span |
The minimum value of concrete beam 1 / 18 is the maximum value of high span ratio of steel structure. In the conventional design, the general steel beam is 1 / 20, for the steel beam of light roof, the high span ratio can be reduced to 1 / 30, generally not less than 1 / 40.
5. Self-weight of Building
Steel Structure | Concrete Construction |
0.6~0.8 t/m² | 1.0~1.5 t/m² |
From the proportional point of view, the use of steel structure of the building, the weight will be reduced by more than 40%. Some studies have particularly compared the different structural systems of a 50m high-rise office building, given the upper pure structure weight, to reduce more. The upper building area of the office building is 10,400sqm, the weight of each square structure is reduced by 56%, and the cost of the foundation is reduced by 7.5%.
Steel Frame | Concrete frame-shear force |
0.517 t/m² | 1.178 t/m² |
6. Foundation
Steel Structure | Concrete Construction |
The upper weight is light, the structure of the foundation will be simple | Large weight, the basic engineering cost is higher |
Although the weight is light, if the two structural forms are independent bases, then the proportion of cost reduction will be less, about 7%. If the form of the foundation because of the weight reduction can be changed: the concrete structure is a raft foundation, and the steel structure can be converted to an independent foundation, the proportion of cost reduction will be considerable, estimated to be about 15%.
7. Reliability of the Components
Steel Structure | Concrete Construction |
Steel components are manufactured in the factory with high precision | The amount of field operation is large, many sizes are unavoidable human error, especially the protective layer of steel reinforcement |
8. Durability
Steel Structure | Concrete Construction |
If do rust treatment and add decorative layer, can be used for a long time | Avoid shrinkage crack, so pay attention to prevention and control; prevent concrete carbonization and steel rust. |
The durability of steel structure lies in the design of external protection measures, and the durability of concrete structure lies in the design of concrete itself.
9. Fire Resistance
Steel Structure | Concrete Construction |
Steel itself fire resistance time is short, generally want to do fire protection | With the own fire protection, generally do not need to increase fire protection measures |
10. Construction Time
Generally speaking, the steel structure must shorten the construction period than the reinforced concrete structure, mainly because of the construction foundation, the steel structure can be processed at the same time in the factory, and there is no wet operation on site, no need for time-consuming maintenance like concrete.
11. Perforated Beam
Steel Structure | Concrete Construction |
About 1 / 2 of the beam height, the ventilation pipe class can generally pass through the beam | About 1 / 3 of the beam height, and the ventilation pipe generally needs to go from under the beam |
12. Floor Height
Steel Structure | Concrete Construction |
Beam height + 35.0cm (floor surface + floor + fire protection layer + ceiling) + indoor clean height | Beam height + 45.0cm (floor surface + ventilation duct + ceiling) + indoor clean height |
Under the same indoor net height requirements, reducing the structural beam height can reduce the height of the structure and reduce the construction cost. If the number of layers is more, under the same building height, it is possible to increase the floor area of the building.
13. Decoration Materials and Deformation Restrictions
Steel Structure | Concrete Construction |
Dry hanging construction autoclaved light concrete, extrusion forming cement board in the height of 1 / 150 below | Mainly using dry hanging construction has no deformation problem |
The decorative materials matching with the steel structure building are generally mainly dry hanging. Both can choose light weight decorative materials, and can consider the deformation of steel structure to avoid cracks. The interlayer displacement Angle of steel structure is generally relatively loose, the limit of the code is 0.004, and the concrete structure is generally 0.002-0.001.
14. Recycling
In the long run, this is a plus for the steel structure. Steel is the most highly recycled material on the planet. By weight, 81% of steel products in the United States are recycled at the end of their service life. These includes 85% of cars, 82% of appliances, 70% of containers, 72% of steel and 98% of structural steel.
Brief Summary
The building space of the steel structure is more open, and the functional layout is more free.
The steel columns are relatively smaller in size.
The height of the steel beam is lower, but the thickness of the floor should be considered.
The weight of the steel structure building is much lighter, and the cost of the infrastructure construction can also be saved accordingly.
Although the steel structure has many advantages of the above compared with concrete, especially in the industrial factory, warehouse, large gymnasium, exhibition hall and other industrial buildings, public buildings occupy an absolute advantage.
If you are interested in constructing a prefabricated steel structure building, you might be wondering how to turn your thoughts into action.
Call a steel structure building specialist for assistance now, we are available where you need us.
Mobile/Whatsapp/Wechat: +86-15853209069
Email: anna@sinosteelstructure.com
