Load-Bearing Standard for Prefabricated House Slabs

The load-bearing standard for prefabricated house slabs is influenced by multiple factors and does not have a fixed value. It needs to be comprehensively determined based on the specific type, purpose, and design specifications. The following provides a detailed explanation from different classification perspectives:

Calculated by Uniformly Distributed Load

1. Concrete Hollow Prefabricated Slabs: The national standard is 200-250 kilograms per square meter, suitable for scenarios such as ordinary residential floor slabs.
2. Solid Prefabricated Slabs: The conventional 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, with sufficient reinforcement and a concrete grade of C30 or above, the load-bearing capacity can reach 300 kilograms per square meter.
3. Prestressed Prefabricated Slabs: When the span is within 3 meters, they can bear 300-400 kilograms per square meter. When the span exceeds 4 meters, the load-bearing capacity drops to 250-300 kilograms per square meter, but it is 20% higher than that of ordinary prefabricated slabs of the same span.
4. Cement Prefabricated Slabs: The design load for ordinary residences is usually 200 kilograms per square meter. For commercial or industrial-use prefabricated slabs, the load-bearing capacity can reach 500 kilograms per square meter.

Classified by National Standard Grades

1. Grade I Slabs: There are two sayings. One states that the standard value is 100 kilograms per square meter, suitable for placing lightweight items and commonly used in civil buildings. The other says the load-bearing capacity is 400 kilograms per square meter, suitable for temporary storage or placing light furniture.
2. Grade II Slabs: The load-bearing capacity is 700 kilograms per square meter, meeting the daily living needs of general residences and being a commonly used grade in residential buildings.
3. Grade III Slabs: The load-bearing capacity reaches 1000 kilograms per square meter, specifically designed for heavy industrial buildings or special occasions.
4. Grade IV Slabs: The load-bearing capacity is over 400 kilograms, suitable for places with high load requirements such as gyms and factories.

Classified by Material

1. Concrete Prefabricated Slabs: Generally, the load-bearing capacity per square meter can exceed 10 tons, suitable for scenarios that bear the pressure of large-scale mechanical equipment or vehicles.
2. Reinforced Concrete Prefabricated Slabs: The load-bearing capacity usually exceeds 15 tons, commonly used in bridge construction, large warehouses, and industrial facilities that require extremely high structural strength.
3. Cement Fiber Prefabricated Slabs: The load-bearing capacity per square meter is 8-12 tons, suitable for occasions that need to reduce the structural load, such as some light industrial buildings.
4. Prestressed Concrete Prefabricated Slabs: The load-bearing capacity is approximately 15-20 tons, mostly used in large bridges, high-rise buildings, and important projects. The prestressing technology enhances crack resistance and load-bearing capacity.