Load-Bearing Standards for Prefabricated Houses

The load-bearing standards for prefabricated houses vary depending on the type, specifications, span, and design grade of the prefabricated panels, with a common range of 200-400 kilograms per square meter. The specific standard needs to be determined based on actual parameters.

1. Classification by Prefabricated Panel Type

• Concrete Hollow Prefabricated Panels: According to national standards, their load-bearing capacity is 200-250 kilograms per square meter. Due to their internal hollow structure, these panels are relatively lightweight. However, when the span is large, attention should be paid to reinforcement design to avoid local stress concentration leading to cracking.
• Solid Prefabricated Panels: Their load-bearing capacity is 250-300 kilograms per square meter. If produced by large factories with sufficient reinforcement and high-grade concrete (such as C30 or above), the load-bearing capacity can be increased to 300 kilograms per square meter. Solid panels have a dense structure and excellent impact resistance, making them suitable for scenarios with high load requirements.
• Prestressed Prefabricated Panels: By applying prestress, these panels improve crack resistance. When the span is within 3 meters, the load-bearing capacity can reach 300-400 kilograms per square meter; when the span exceeds 4 meters, the load-bearing capacity decreases to 250-300 kilograms per square meter. For these panels, strict control of the prestress tensioning process is required to ensure long-term stability.

2. Classification by Residential Floor Design Grade

Prefabricated panels are classified into different grades based on the live load standard value:

• Grade I Panels: The standard value is 100 kilograms per square meter, suitable for auxiliary spaces with extremely low load requirements (such as storage rooms).
• Grade IV Panels: The standard value exceeds 400 kilograms per square meter, suitable for heavy-load scenarios such as commercial buildings or industrial plants.
• Ordinary Residential Floor Panels: According to national regulations, their load-bearing standard is 200 kilograms per square meter. In actual design, it is usually implemented at 250-300 kilograms per square meter to balance safety and economy.

3. Key Influencing Factors

• Span: The larger the span of the prefabricated panel, the more significant the deflection (deformation). To ensure safety, it is necessary to increase the panel thickness, reinforcement, or reduce the load. For example, the load-bearing capacity of a panel with a span of 6 meters may decrease by more than 30% compared to a panel with a span of 3 meters.
• Concrete Grade: The higher the grade (such as C30 compared to C20), the greater the compressive strength, and the corresponding increase in load-bearing capacity.
• Reinforcement Ratio: The diameter, spacing, and arrangement of steel bars directly affect the flexural performance. Reasonable reinforcement can significantly improve the load-bearing limit.

4. Practical Application Recommendations

When designing or renovating a prefabricated house, it is necessary to select the appropriate grade of prefabricated panels according to the specific purpose and have the load calculated by a professional institution. For example, if a regular residence needs to add heavy equipment (such as a piano or a large fish tank), solid panels or prestressed panels should be preferred, and the equipment should be evenly distributed to avoid local overload.