Brick-Concrete Prefabricated Slab Structure House

A brick-concrete prefabricated slab structure house is a hybrid structural system where load-bearing components such as brick walls, reinforced concrete beams, and prefabricated hollow floor slabs work together. It has specific advantages and disadvantages and poses seismic safety hazards, currently facing the need for seismic reinforcement and energy-saving renovation.

Structural Characteristics and Composition

In a brick-concrete prefabricated slab structure house, vertical load-bearing components are constructed using bricks or blocks, while horizontal components are made of reinforced concrete. The floor slabs are prefabricated hollow slabs. This structural system offers advantages such as simple construction, easy material sourcing, and low cost.

Advantages

• Good Performance: It provides relatively good sound insulation and thermal insulation, meeting basic requirements for environmental comfort in daily living. Additionally, it exhibits excellent durability and fire resistance, ensuring normal use and safety of the house over a certain period.
• Economical and Practical: With simple construction and low cost, it enabled rapid and large-scale construction during times of relative material scarcity in the last century, addressing the housing needs of a large population.

Disadvantages

• Poor Integrity: Prefabricated slabs are like individual puzzle pieces simply placed on walls, lacking strong connections between them. This results in poor overall integrity of the house and makes it non-seismic-resistant. Under external forces such as earthquakes, prefabricated slabs are prone to falling, and staircase walls are also susceptible to collapse. For example, during the 1976 Tangshan earthquake, prefabricated brick-concrete houses suffered severe damage.
• High Self-Weight: The weight of brick walls and prefabricated slabs is relatively large, imposing high requirements on the foundation's bearing capacity and increasing the difficulty and cost of foundation construction.
• High Labor Intensity and Wet Operations: Construction involves a large amount of manual labor for tasks such as bricklaying and installing prefabricated slabs, along with numerous wet operations, resulting in a relatively long construction period.

Current Situation and Renovation

After 2008, the country urgently revised building seismic codes, comprehensively strengthening structural columns and ring beams in staircases and gradually phasing out prefabricated slabs in favor of cast-in-place floor slabs. Currently, there are a large number of multi-story brick-concrete houses from the last century across the country. Their seismic reinforcement and energy-saving renovation are important aspects of urban renewal. Through reasonable renovation measures, the seismic performance and energy efficiency of houses can be improved, extending their service life.