House Reinforcement: Prefabricated Slab Damage

After the damage of the prefabricated slab in a house, it is necessary to select appropriate reinforcement methods such as section enlargement reinforcement, carbon fiber sheet bonding reinforcement, or structural load path modification reinforcement based on the specific situation.

Causes of Damage

The main cause of prefabricated slab damage is excessive load exceeding its bearing capacity. For example, in the prefabricated slab fracture incident in Fengshou Community, Guanba Town, Zhong County, Chongqing, it was initially determined that the cause of the accident was the excessive temporary stacking load on the second-floor slab, which exceeded the bearing capacity of the prefabricated slab, leading to brittle fracture and falling of the slab. This indicates that when the weight borne by the prefabricated slab exceeds its designed bearing capacity, damage is likely to occur.

Drawbacks of Prefabricated Slab Houses

• Short Service Life: Due to their material and structural characteristics, prefabricated slab houses have a relatively short service life and are difficult to meet long-term usage requirements.
• Poor Seismic Performance: The seismic capacity of prefabricated slab houses is almost zero. The connection points are extremely fragile, and the materials often suffer from shoddy workmanship, resulting in high brittleness and easy fracture. In the event of natural disasters such as earthquakes, prefabricated slab houses are highly susceptible to damage, posing a serious threat to the safety of occupants.
• Poor Layout and Performance: The layout of prefabricated slab houses often fails to meet current residential needs, and their thermal and sound insulation performance is also poor, affecting the comfort of living.

Considerations for Reinforcement and Reconstruction

• Reinforcement Cost and Effectiveness: From an economic perspective, the cost of reinforcing prefabricated slab houses is relatively high, approximately 800 - 1200 yuan per square meter. Moreover, reinforcement can only extend the service life by a maximum of fifteen to twenty years, and there may also be issues with engineering quality.
• Benefits of Demolition and Reconstruction: Although demolition and reconstruction are costly, they can bring benefits such as land appreciation and asset value increase. From a safety perspective, the phasing out of prefabricated slab houses by the state is also based on safety hazards such as their poor seismic capacity. Therefore, when deciding whether to reinforce or demolish and reconstruct, it is necessary to comprehensively consider factors such as economic costs, safety considerations, and future usage needs.