Bearing Capacity of Prefabricated Slab Structure Houses

The bearing capacity of prefabricated slab structure houses does not have a fixed value and needs to be comprehensively determined based on the house's purpose, design specifications, and structural parameters. The following is a detailed analysis:

1. Classification of Design Load Standard Values

According to the "Building Structural Load Code" (GB 50009), the standard values of live loads on the floors of prefabricated slabs are classified into four categories based on their purposes:

1. Residential Buildings (such as houses, dormitories, and hotels): 2.0 kN/m² (approximately 200 kg/m²), meeting the needs of daily personnel activities and the placement of ordinary furniture.
2. Public Buildings (such as offices, classrooms, and conference rooms): 2.0-2.5 kN/m², taking into account situations with dense personnel or concentrated equipment.
3. Special-Function Rooms (such as hospital wards and laboratories): 3.5 kN/m² or higher, requiring the bearing of heavy loads such as medical equipment or laboratory instruments.
4. Storage and Traffic Areas (such as warehouses and garages): 10-20 kN/m², meeting the requirements for the passage of light trucks or the stacking of goods.

2. Key Factors Affecting Bearing Capacity

1. Material Properties: The concrete strength grade (C20-C40) directly affects the compressive strength, while the diameter and spacing of steel bars determine the tensile capacity. For example, prestressed hollow slabs enhance their flexural performance through high-strength steel bars.
2. Geometric Parameters: The slab thickness, span, and effective height are core indicators. Taking the YKB series of prestressed hollow slabs as an example, an increase in the web thickness can significantly improve the shear capacity, while an increase in the span reduces the bearing efficiency.
3. Construction Quality: The density of grouting in the gaps between slabs affects the overall integrity. Insufficient anchor measures at the supports can easily lead to local stress concentration, causing cracks or collapse risks.

3. Precautions for Use and Renovation

1. Load Differentiation Principle: Dead loads (structural self-weight, decoration layers) and live loads (personnel, equipment) should be strictly differentiated, and overloading is strictly prohibited. For example, adding partition walls or large fish tanks may change the load distribution and require re-calculation.
2. Renovation of Old Houses: Before adding floors or changing functions, it is necessary to entrust a professional institution to test the remaining bearing capacity of the prefabricated slabs, evaluate the depth of concrete carbonation, the degree of steel bar corrosion, etc., and formulate a reinforcement plan (such as pasting carbon fiber sheets or adding supports).
3. Dynamic Monitoring: For prefabricated slab houses with a service life of more than 30 years, it is recommended to regularly inspect cracks and deformations and take timely action if abnormalities are found.

Conclusion: The bearing capacity of prefabricated slabs needs to be determined through professional design calculations. Users should avoid self-renovation or overloading to ensure structural safety.