What is the Weight-Bearing Capacity of Prefabricated House Slabs?
The weight-bearing capacity of prefabricated house slabs does not have a fixed value and is influenced by various factors. Generally, prefabricated slabs in ordinary residential buildings can bear around 200 kilograms per square meter, but there are significant differences in the weight-bearing capacities of different types of prefabricated slabs. Details are as follows:
Classification by National Standard Grades: Grade 1 slabs have a load-bearing capacity of 400 kilograms per square meter, Grade 2 slabs have a load-bearing capacity of 700 kilograms per square meter, and Grade 3 slabs have a load-bearing capacity of 1000 kilograms per square meter. Ordinary residential buildings mostly use Grade 1 and Grade 2 slabs, while high-rise buildings, which have higher requirements for the load-bearing capacity of prefabricated slabs, will choose grades with stronger load-bearing capabilities.
Classification by Material: Concrete prefabricated slabs generally have a load-bearing capacity exceeding 10 tons per square meter under normal circumstances; reinforced concrete prefabricated slabs usually have a load-bearing capacity of over 15 tons per square meter; cement fiber prefabricated slabs generally have a load-bearing capacity of 8 - 12 tons per square meter; and prestressed concrete prefabricated slabs have a load-bearing capacity of approximately 15 - 20 tons per square meter.
Classification by Common Types: Common concrete hollow slabs have a national standard load-bearing capacity of 200 - 250 kilograms per square meter; solid prefabricated slabs can bear 250 - 300 kilograms per square meter. Solid slabs produced by large factories, with sufficient reinforcement and high concrete grades (C30 and above), can have a load-bearing capacity of up to 300 kilograms per square meter; prestressed prefabricated slabs with a span of less than 3 meters can bear 300 - 400 kilograms per square meter, and those with a span of more than 4 meters can maintain a load-bearing capacity of 250 - 300 kilograms.
Other Influencing Factors: The load-bearing capacity of prefabricated slabs is also affected by factors such as span, thickness, reinforcement, and load type. Shorter prefabricated slabs have stronger load-bearing capacities; a 10-centimeter-thick prefabricated slab can bear more than an 8-centimeter-thick one, and slabs with thicker and denser reinforcement have stronger load-bearing capacities; prefabricated slabs are vulnerable to 'concentrated loads', and evenly distributed weights are safer than weights concentrated at a single point. For example, for a 4-meter prefabricated slab, placing a 2-ton item in the middle may lead to fractures or cracks over time. However, if the 2-ton item is placed at both ends, adjacent to beams, columns, and load-bearing walls, and multiple support points are set up at the bottom of the items at both ends, it can withstand the load.
