Seismic Resistance of Cement Prefabricated Houses

The seismic performance of cement prefabricated houses varies significantly depending on their structural design and construction methods. Modern prefabricated houses that meet seismic standards have strong seismic resistance, while early prefabricated panel houses have poor seismic performance, and a strict distinction must be made between the two.

Technical Advantages of Modern Seismic-Resistant Cement Prefabricated Houses

1. Structural Advantages: They are poured with C35 high-strength concrete and have built-in φ12 - 18 deformed steel bars. Each column is reinforced with 8 steel bars, forming a load-bearing system similar to a “steel bar cage”. Their lateral stiffness is 6.8 times that of traditional brick-concrete structures, enabling them to effectively resist horizontal seismic forces and reduce structural lateral displacement and deformation.
2. Connection Technology: Modules are welded using E55 welding electrodes, with each connection point able to withstand a tensile force of 20 tons. In a rare 9-degree earthquake, the maximum displacement between modules is only 15 cm, and the overall structure remains intact. This indicates that the connection nodes have high strength and good ductility, ensuring that the modules work together during an earthquake and preventing local damage from causing overall collapse.
3. Energy Absorption Design: The steel bar mesh absorbs energy through elastic deformation and can withstand a maximum deformation of 15 cm without breaking, which is 7.5 times the safety threshold of 2 cm for brick-concrete structures. This design allows the structure to consume energy through its own deformation during an earthquake, reducing the impact of the earthquake on the main body and improving the structure's seismic resistance.
4. Actual Measurement Data: Under the same seismic intensity, when the brick-concrete wall cracks, the strain of the cement house wall is only 1/8 of that of the brick-concrete wall, truly achieving “no collapse in major earthquakes and repairability in minor earthquakes”. This shows that modern cement prefabricated houses can maintain better integrity during earthquakes, reducing repair costs and the risk of casualties.

Seismic Defects of Early Cement Prefabricated Panel Houses

The early “cement prefabricated panel houses” used spliced floor slabs with gaps between the panels, resulting in poor overall structural integrity. Under seismic action, relative displacement easily occurs between the panels, leading to connection failure. Even minor earthquakes can cause collapse. These houses were mostly used in non-load-bearing parts of low-rise buildings, posing significant safety hazards, and have gradually been replaced by modern seismic technology.

Key Distinguishing Points

It is necessary to strictly distinguish between the structural differences between traditional prefabricated panel houses and modern prefabricated concrete houses. Modern houses significantly improve safety through industrial design (such as full-frame shear walls and flexible connections) and meet seismic standards. In contrast, early prefabricated panel houses cannot meet seismic requirements due to outdated technology and should not be equated with modern cement prefabricated houses.