Load-Bearing Structure of Container Houses

The load-bearing structure of container houses is centered around a steel frame, which is formed by welding section steel to create an overall framework. The thickness of the steel used for the main beams and columns, as well as the welding process, directly affect the load-bearing capacity and safety.

I. Composition and Function of the Steel Frame

The load-bearing structure of container houses evolved from freight containers, with its core being a standard steel frame welded from section steel (such as angle steel and channel steel). This frame serves as the 'skeleton' of the house, bearing both vertical and horizontal loads to ensure overall stability. For example, the frame of a standard shipping container connects the main beams and columns through welding, forming a closed load-bearing system capable of withstanding external forces during lifting, stacking, and transportation. Steel thickness is a critical parameter: The thickness of the main beams and columns directly affects the maximum load-bearing capacity, with thicker steel enhancing resistance to deformation and extending service life.

II. Quantitative Standards for Load-Bearing Capacity

According to international standards, the load-bearing capacity of container houses is related to their size:

• 20-foot container: Can bear approximately 25 tons, suitable for single-story or small-scale combined buildings;
• 40-foot container: Can bear approximately 45 tons, often used for multi-story or large-scale combined structures.
  These figures are based on the original design of shipping containers, which must withstand stacking up to 8-9 layers during long-distance transportation. After being converted into houses, reinforcement (such as adding internal support columns and optimizing welding joints) can further enhance load-bearing performance to accommodate more complex architectural forms.

III. Key Factors Affecting Load-Bearing Capacity

1. Steel Quality and Corrosion Protection:
   Steel must possess high strength and toughness, while also being protected from corrosion through overall galvanization or spraying with anti-corrosion coatings. Corrosion can weaken the steel cross-section, reducing load-bearing capacity and even posing safety risks. For example, an unprotected container may rust through within 5 years in a humid environment, while a galvanized container can last more than 15 years.
2. Welding Process:
   Welding must be full and free of cold solder joints to ensure firm node connections. Cold solder joints can lead to stress concentration, making them prone to cracking under load and affecting overall stability.
3. Structural Combination Method:
   Combining containers (such as side-by-side or stacked arrangements) can expand building scale, but requires recalculating load distribution. For example, multi-story combinations require additional horizontal support beams to prevent local overloading.