Load-Bearing Capacity of Prefabricated Slab Houses per Square Meter

The load-bearing capacity of prefabricated slab houses per square meter typically ranges from 200 to 400 kilograms, depending on the type, specifications, and usage scenario. Specific values need to be determined by considering the slab type, thickness, span, and grade.

I. Load-Bearing Capacity by Slab Type

1. Hollow Prefabricated Slabs

   • Hollow slabs for ordinary bungalows: The static load-bearing capacity per square meter is approximately 200-300 kilograms, significantly influenced by slab thickness, concrete mix ratio, and steel bar arrangement. For example, a 10-centimeter-thick slab increases load-bearing capacity by about 20% compared to an 8-centimeter-thick slab, but the benefit diminishes beyond 12 centimeters.
   • National standard concrete hollow slabs: The load-bearing range is 200-250 kilograms per square meter, meeting the requirement for residential floor live loads of at least 200 kilograms (including the total load-bearing capacity of the floor slab itself, approximately 760 kilograms, but actual values vary significantly due to thickness differences, e.g., 150-250 kilograms for a 10-centimeter-thick slab and up to 250 kilograms for a 12-centimeter-thick slab).

2. Solid Prefabricated Slabs The basic load-bearing capacity is 250-300 kilograms per square meter. If produced by large manufacturers such as Jianhua Building Materials and China Railway 14th Bureau Group, using C30 or higher-grade concrete with sufficient steel reinforcement, the load-bearing capacity can be increased to 300 kilograms per square meter.

3. Prestressed Prefabricated Slabs

   • For spans within 3 meters: The load-bearing capacity per square meter is 300-400 kilograms.
   • For spans over 4 meters: The load-bearing capacity decreases to 250-300 kilograms, but it is still 20% higher than that of ordinary slabs of the same span.

II. Load-Bearing Capacity by Grade

Prefabricated slabs are classified into four grades based on load-bearing capacity:

• Grade I slabs: Standard value of 100 kilograms per square meter, suitable only for placing lightweight items (e.g., furniture, decorations).
• Grade II slabs: Standard value of 200 kilograms per square meter, meeting the daily usage needs of ordinary residences.
• Grade III slabs: Standard value of 300 kilograms per square meter, suitable for medium-load scenarios (e.g., multi-story residences, small shops).
• Grade IV slabs: Standard value of over 400 kilograms per square meter, designed specifically for high-load scenarios (e.g., gyms, factories, warehouses).

III. Key Influencing Factors

1. Thickness: For every 2-centimeter increase in slab thickness, the load-bearing capacity increases by about 20%, but the effect diminishes beyond 12 centimeters.
2. Concrete Grade: C30 or higher-grade concrete significantly enhances compressive strength.
3. Steel Bar Arrangement: The amount of steel reinforcement directly affects flexural capacity. Prestressed slabs have superior load-bearing capacity compared to ordinary slabs due to pre-applied stress.
4. Span: The greater the span, the lower the load-bearing capacity. This can be compensated for by increasing slab thickness or using prestressed technology.

In practical use, it is essential to select the appropriate slab type based on building design specifications and specific usage scenarios, and avoid overloading to ensure safety.