Seismic Resistance of Prefabricated Cement Houses
Prefabricated cement houses have good seismic performance. Their seismic capacity is 8 times that of traditional brick-and-concrete structures. Some products claim to be able to withstand magnitude-8 earthquakes and have performed excellently in earthquake simulation tests and actual earthquakes. The specific reasons are as follows:
1. Skeletal-level structure: High-strength load-bearing system Prefabricated cement houses are poured with C35 concrete and have built-in φ12 - 18 deformed steel bars. Each column is reinforced with 8 steel bars, forming a load-bearing structure like a “steel bar cage”. Its lateral stiffness is 6.8 times that of brick-and-concrete structures, equivalent to being able to withstand the impact force of 6.8 trucks hitting simultaneously. This structure can effectively resist the lateral forces in the horizontal direction during an earthquake, reducing the risk of house tilting or collapse. For example, the prefabricated cement houses near the earthquake ruins in Ludian, Yunnan, remained stable after multiple aftershocks, while the surrounding brick-and-concrete houses were full of cracks, which visually demonstrated their structural advantages.
2. Flexible connection technology: High-strength connection between modules The house modules are welded with E55 welding rods (with a tensile strength of 550 MPa), and each connection point can withstand a tensile force of 20 tons. In the earthquake simulation test in Yunnan, when the house experienced a rare magnitude-9 earthquake (stronger than the Wenchuan earthquake), the maximum displacement between modules was only 15 cm, and the overall structure did not collapse. In contrast, brick-and-concrete structures had wall collapses at a seismic intensity of magnitude 5. Flexible connections allow the modules to have slight displacements during an earthquake, avoiding structural damage caused by stress concentration while maintaining overall stability.
3. Energy absorption design: Elastic deformation to absorb earthquake energy The steel bar mesh acts like a “building spring”. During an earthquake, it 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-and-concrete structures. Comparative experiments show that under the same seismic intensity, when the brick-and-concrete wall cracks, the strain of the cement house wall is only 1/8 of that of the brick-and-concrete wall. This design enables the house to “overcome hardness with softness” during an earthquake, consume energy through deformation, reduce structural damage, and truly achieve “no collapse in major earthquakes and repairability in minor earthquakes”.
In addition, similar products such as the cement container prefabricated houses from Luanzhou Cijin Products also have similar seismic functions, further verifying the reliability of prefabricated cement houses in the field of earthquake resistance.
