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What is the load-bearing performance of square tubes

Source：www.cqikk.com Release date： 2024-11-18

Information summary：The load-bearing performance of square tubes is influenced by various factors. The following is a detailed introduction: 1、 The characteristics of the material itself 1. Material type The load-bearing performance of square tubes made of different materials varies greatly. For example, ordinary carbon steel square tubes have relatively high strength, with a yield strength generally between

The load-bearing performance of square tubes is influenced by various factors. The following is a detailed introduction:
1、 The characteristics of the material itself
1. Material type
The load-bearing performance of square tubes made of different materials varies greatly. For example, ordinary carbon steel square tubes have relatively high strength, with a yield strength generally between 235MPa and 345MPa, and can withstand large weights. The strength of stainless steel square tube is also good, and it has good corrosion resistance. Aluminum alloy square tubes have relatively low strength, but their density is low and their weight is light, making them more suitable for situations where load-bearing requirements are not particularly high.
2. Size and wall thickness of materials
The side length and wall thickness of square tubes are key factors affecting their load-bearing performance. Generally speaking, the larger the side length and the thicker the wall thickness, the stronger its load-bearing capacity. For example, a square tube with a side length of 50mm and a wall thickness of 3mm definitely has a stronger load-bearing capacity than a square tube with a side length of 30mm and a wall thickness of 2mm. From a mechanical perspective, increasing wall thickness can improve the section moment of inertia and section modulus of square tubes, enabling them to withstand greater bending moments and pressures.
2、 Structural form and supporting conditions
1. Structural form
Simple beam structure: When square tubes are used as simple beams, such as building a simple platform, their load-bearing performance mainly depends on the span of the beam, the distribution of the load it is subjected to, and so on. If it is a uniformly distributed load (load evenly distributed on the beam), according to the beam bending theory of material mechanics, the bending moment of the beam is proportional to the square of the span. So, under the same load, the smaller the span, the greater the weight that the square tube can bear. For example, a square tube beam with a length of 2m can withstand greater weight than a square tube beam with a length of 4m under the same load distribution.
Frame structure: In a frame structure, square tubes serve as columns or beams, and their load-bearing performance is also related to the overall stability of the frame. The connection method of nodes in the framework structure has a significant impact on load-bearing capacity. If it is a rigid connection, the square tubes can better transmit bending moments and shear forces, and the overall stability and load-bearing capacity of the structure will be enhanced; If it is a hinged connection, its stress situation is different, and its load-bearing capacity is relatively weak.
2. Supporting conditions
The support method of square tubes can also affect their load-bearing performance. For example, square tubes with fixed ends have better load-bearing capacity than those with simply supported ends (which can rotate freely). For square tubes with fixed ends, their deformation is limited by end constraints when subjected to loads, and they can withstand greater bending moments. In practical applications, such as scaffolding in buildings, if the support feet of the square tube are firmly fixed, its load-bearing performance will be effectively improved.
3、 Load type and usage environment
1. Load type
Static load: Static load refers to the load that acts on a square tube for a long time and remains basically unchanged in size and direction, such as the self weight of a building. The bearing capacity of square tubes for static loads is relatively easy to evaluate, as long as their strength and stability meet the requirements, they can generally withstand long-term loads. For example, when building an indoor storage rack, the weight of items placed on the square tube rack remains basically unchanged. Under this static load, as long as the specifications of the square tube are designed reasonably, its safe load-bearing capacity can be guaranteed.
Dynamic load: Dynamic load refers to the force generated by the motion of an object, such as the impact force of a moving vehicle on a bridge square tube structure, the force generated by machine vibration, etc. The requirements for dynamic loads on the pipeline are higher, as it not only has to bear static weight, but also inertia and impact forces generated by motion. In this case, it is necessary to consider the fatigue strength and toughness of the square tube to prevent fatigue failure under repeated dynamic loads.
2. Operating environment
Environmental factors can also affect the load-bearing performance of square tubes. In high temperature environments, the strength of materials will decrease. For example, when carbon steel increases in temperature, its yield strength will decrease, thereby affecting the load-bearing capacity of square tubes. In humid or corrosive environments, square tubes may corrode, especially for ordinary carbon steel square tubes, which can weaken their cross-sectional dimensions and reduce their load-bearing capacity. Therefore, when using square tubes in these environments, anti-corrosion measures such as painting, galvanizing, etc. need to be considered.

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