| Application: | High Rise Framing |
|---|---|
| After-sales Service: | Yes |
| Warranty: | 6 Months |
| Type: | Heavy Section Steel |
| Standard: | GB, ASTM, JIS, BS |
| Trademark: | Quality Carbon Structural Steel and Alloy Structural Steel, FM |
| Customization: |
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Audited Supplier High Rise Building Steel Frame Construction Structural Steel Fabricators Metal Steel Fabrication
As the professional foreign standards metal steel fabricator, we are quite capable to fabricate various high rise structural steel frames based on either EU-US or UK AU etc standard and requirements.
High-rise building steel structure frame generally refers to a structural system with more than six layers (or more than 30m), mainly using section steel, steel plates to connect or weld into components, and then connect and weld to form a structural system.
High-rise steel structure generally refers to a structural system with more than six layers (or more than 30m), which is mainly connected or welded by section steel and steel plate, and then connected and welded. High-rise steel structures are commonly used in the form of steel frame structure, steel frame-concrete core tube structure. The latter is widely used in modern high-rise and super high-rise steel structures. In fact, it belongs to steel-concrete hybrid structures.
As an important load-bearing structural system, steel frame structure is widely used in residential, office, entertainment and other public buildings.
Basic requirements for the selection of high-rise steel structure materials
(1) Principles of steel selection
The principle of steel selection is: not only can the structure be safe and reliable and meet the requirements of use, but also save steel and reduce the cost as much as possible. Different conditions of use should have different quality requirements. Of course, it is not advisable to choose high-quality steel easily in general structures, and it is even more difficult to blindly choose poor-quality steels in major structures. As far as the mechanical properties of steel are concerned, the yield point, tensile strength, elongation, cold bending performance, impact toughness and other indicators are indicators to measure the quality of steel from various aspects. According to the characteristics of the structure, choose the appropriate steel. Whether the steel selection is appropriate is not only an economic issue, but also related to the safety and service life of the structure.
The following structural characteristics should be considered when selecting steel:
1. Types of structures and their importance
Due to the different use conditions and the location of the structure, the structure can be divided into three categories: important, general and secondary. For example, civil long-span roof trusses, heavy duty crane beams, etc. are important; roof trusses and columns of ordinary workshops are general; ladders, railings, platforms, etc. are secondary, and steel should be selected differently according to different situations 's number.
2. The nature of the load
According to the nature of the load, the structure can be divided into two types: static load and dynamic load. In structures or components that are subjected to dynamic loads, there is a distinction between often full load and infrequent full load. Therefore, if the load properties are different, different grades should be selected. For example, for heavy duty crane beams, steels with good impact toughness and fatigue properties, such as Q345C or Q235C, should be used. For structures or components that generally bear static loads, such as ordinary welded roof trusses and columns (under normal temperature conditions), Q235BF can be selected.
3. Connection method
Different connection methods have different requirements for steel quality. For example, for welded steel, due to the inevitable welding stress, welding deformation and welding defects during the welding process, it is easy to cause notch sensitivity when the force properties change and temperature changes, resulting in cracks and even brittle fractures. Therefore, the welded steel structure has higher requirements on the chemical composition, mechanical properties and weldability of the steel. For example, the content of carbon, sulfur and phosphorus in the steel should be low, the plasticity and toughness index should be high, and the weldability should be good. However, for non-welded structures (such as structures connected with high-strength bolts), these requirements can be relaxed.
(2) Basic requirements for the selection of high-rise steel structure materials
1. The steel grade, steel grade, strength design value, selection principle, required mechanical properties, chemical composition limits, etc. of the steel used in the high-rise steel structure, as well as the requirements for the welding materials, bolt fasteners and other materials used for connection, except Except for the cold bending performance of steel as the basic guarantee condition, the others are basically the same as the general steel structure. The strength design value of thick plate steel should be implemented in accordance with the provisions of the "High-rise Building Steel Structure Design and Construction Regulations". In addition, Q235A grade ordinary carbon structural steel should only be used as secondary non-welded components.
2. The steel properties of the steel structure of earthquake-resistant high-rise buildings should also meet the following requirements:
(1) The yield-to-strength ratio of steel shall not be lower than 1.2, and the structure with seismic fortification of 8 degrees and above shall not be lower than 1.5;
(2) There is an obvious yield step, the elongation is greater than 20%, and it has good weldability to maintain ductility;
(3) The yield point of steel for high-rise buildings of Category A and B should not exceed 10% of the standard value.
3. When the load-bearing structure is exposed and in a low temperature environment, the steel should also consider the requirements of atmospheric corrosion resistance and avoiding low temperature cold brittleness.
4. Within the range of beam-column joints connected by welding, when the joints are strongly restrained, the plate thickness is greater than 50mm, and the tensile force in the plate thickness direction is subjected to the tensile force along the plate thickness direction, the elongation rate in the plate thickness direction shall be additionally required (more than 20%). ~25%) to prevent laminar tearing.
5. In the same high-rise structure, different steel grades and strength grades can be selected according to the position of the components and the different stress conditions.
6. The profiled steel plate used for the envelope structure and the composite plate should be made of Q235 steel.
7. The shear bolt welding studs used in high-rise steel structures should meet the requirements of relevant standards, such as nail rod magnetic rings, and special welding tools should be used for welding to ensure their shear bearing capacity.
8. The concrete labels, steel bars and their design strengths used in the composite floor slabs and composite members of the high-rise building steel structure, as well as the lightweight aggregate concrete materials, shall meet the requirements of the current national standards.
Specification:
| Product name | Pure Europe Standard Hot Rolled H Beam Steel in Wide Flange Universal Beams UB Universal Columns UC |
| Standard | GB/T11263-2010 |
| Types | HDGI,PPGI,PPGL |
| Material Grade | Q235B,SM490,SS400,Q345B,Q345,etc |
| Technique | Hot rolled/welded |
| Height | 100-900mm |
| Width | 50-400mm |
| Web thickness | 5-30mm |
| Flange thickness | 7-40mm |
| Tolerance | 2-3% |
| Surface Treatment | 1),Bared 2),Black painted (varnish coating) 3),Galvanized |
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