Find out what is the standard for steel structure?
What is structural steel?
Steel structure is also known as steel frame structure. This is a kind of metal structure with strong bearing capacity, used in steel construction, typically large-scale construction.
In the field of construction, steel structures are used mostly for all kinds of structures, including: heavy industry plants, restaurants, conference centers, infrastructure, airports, etc.
Steel structure standards manufactured from chemical composition in many different forms, in order to suit the technical requirements of each project. Depending on the details and techniques applied to each project or work, different shapes and sizes will appear. However, in practice, common forms such as: I-beam, C-shaped steel, disc steel, angle steel, etc.
Classification of steel structures
It is divided into types of steel frame structures as follows:
- Frame structure: Beam and column
- Grid structure: structure in the form of a grid or dome
- Prestressed structure
- Bridge beams
- Cable-stayed bridge
- Truss structure: bar or truss
- Arch bridge
- Arch architecture
- Suspension bridge
- Truss bridge: truss structure
Summary of the latest steel structure standards 2022
Present, latest steel structure standards 2022 is the NATIONAL STANDARD TCVN 5575: 2012, originating from Russia SNIP II -23 – 81.
In addition, there are a number of necessary reference documents applied in this standard 5575:2012, including:
TCVN 197:2002, Metal. Tensile test method.
TCVN 198:2008, Metal. Bending test method.
TCVN 312:2007, Metal. Normal temperature impact bending test method.
TCVN 313:1985, Metal. Torsion test method.
TCVN 1691:1975, Manual electric arc welding. Basic style and size.
TCVN 1765:1975, Ordinary structural carbon steel. Steel grades and technical requirements.
TCVN 1766:1975, Good quality structural carbon steel. Steel grades and technical requirements.
TCVN 1916:1995: Bolts, screws, studs and nuts. Technical requirements.
TCVN 2737:1995, Loads and impacts. Design standards.
TCVN 3104:1979, Low alloy structural steel. Mark, technical requirements.
TCVN 3223:2000, Electric welding rods for low carbon steel and low alloy steel. Symbols, dimensions and general specifications.
TCVN 3909:2000, Electric welding rods for low carbon steel and low alloy steel. Test method.
TCVN 5400:1991, Welds. General requirements for sampling for mechanical testing.
TCVN 5401:1991, Welds. Bending test method.
TCVN 5402:2010, Welds. Impact bending test method.
TCVN 5709:2009, Hot rolled carbon steel used as structure in construction. Technical requirements.
TCVN 6522:2008, Hot rolled structural steel plate.
The whole method is applied in the form of limit states, the method is applied for safety factors such as: load dissipation factor, safety of working conditions and safety of materials.
TCVN 5575:2012 pays much attention to the stiffness, does not accept too large deformation of the structure.
Example: Horizontal displacement of frame columns, absolutely not exceeding 1/300 for 1-storey buildings and 1/500 for multi-storey buildings. Furthermore, the vertical displacement of the main beam is L/400.
– Strength used to calculate: Standard strength, also known as material safety factor (material safety factor = 1.05 – 1,15 depending on the type of steel).
– Calculated load = standard load * load reliability factor (overload factor). However, in many cases where there are quite a few active loads, there is also a load reduction factor due to the effect of other relevant loads.
– Use more TCVN 2737:1995 as the calculated load for steel structures. With wind load, the method of measuring wind speed corresponds to 3 seconds, rotation cycle within 3 years. The wind coefficient of the outlet water is calculated according to the wind pressure, not the velocity.
– The aerodynamic coefficient is determined by the result of the model pressure in the aerodynamic tube, so it applies to even cuboidal objects.
Why use steel structure?
Steel structure standards really very important, a few reasons why investors or contractors are forced to use:
General structure of steel is the most economical in terms of material, design, construction and warranty costs compared to other traditional methods.
Steel - the material most architects prefer. Steel structure creates extremely large span spanning frames, containing a lot of natural light, so it has a unique aesthetic in architectural design.
Safe and convenient
Steel is processed at the factory and quickly erected at the construction site. Thereby, helping the construction process take place in absolute safety.
In fact, there are quite a few researchers in the construction field who have shown that steel structure standards are the absolutely optimal method for construction management.
There's easier, more flexible future-proofing to suit completely new applications. Under load conditions, expand or change depending on the requirements of the head unit, which is difficult for other frame systems to do.
Can easily withstand network impacts as well as extreme weather conditions such as strong winds, storms, etc. Standard steel structure never corrodes, rusts or termites, molds.
Steel structure standards is always a trend not only in our country but also in the world. That standard can be based on research and application using Vietnamese standards, which will bring safety to users in terms of certainty, sustainability and flexibility.