Seismic Test of Cement Prefabricated Houses

The seismic test of cement prefabricated houses evaluates structural performance through static and dynamic tests and determines whether it meets national standards. Its seismic performance is significantly better than that of traditional brick-concrete structures.

I. Seismic Test Methods

1. Static Testing
   By applying test loads to the house, it simulates the vertical and horizontal forces in actual use and tests the bearing capacity of the roof, walls, foundation, and other parts. During the test, the house should be kept horizontal to avoid tilting or deformation and ensure that the structure remains stable under load.
2. Dynamic Testing
   Using a shaking table or earthquake simulator, different magnitudes, frequencies, and directions of ground motion parameters are input to observe the vibration response and deformation of the house. For example, in a simulated earthquake test in Yunnan, the cement prefabricated house had a maximum displacement of only 15 cm between modules under a rare 9-degree earthquake, and the overall structure did not collapse, verifying its anti-collapse capability.

II. Seismic Test Contents

1. Structural Bearing Capacity Test
   Focus on detecting the ultimate bearing capacity of key parts such as the roof, walls, and foundation to ensure that they do not suffer local damage or overall instability during an earthquake.
2. Seismic Performance Test
   Evaluate indicators such as the horizontal displacement and inter-story deformation of the house during an earthquake. For example, the lateral stiffness of a cement prefabricated house is 6.8 times that of a brick-concrete structure, which is equivalent to being able to withstand the impact force of 6.8 trucks hitting simultaneously, significantly reducing the transmission of earthquake energy.
3. Destructive Testing
   By gradually increasing the load until the structure is damaged, observe the failure modes of the roof, walls, and foundation and analyze their ductility design and energy dissipation capacity.

III. Seismic Performance Advantages

1. Structural Advantages
   It adopts a full-frame shear wall + flexible connection technology, with built-in Φ12 - 18 threaded steel bars. Each column is equipped with 8 steel bars, forming a load-bearing system like a “steel bar cage” and improving the overall lateral resistance.
2. Energy Absorption Design
   The steel bar mesh absorbs earthquake 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, effectively reducing earthquake damage.
3. Actual Case Verification
   In the Ludian earthquake in Yunnan, the prefabricated cement house remained stable after multiple aftershocks, while the surrounding brick-concrete houses were full of cracks, directly proving its seismic reliability.

IV. Evaluation Standards and Safety Guarantees

The test results need to be evaluated according to the “Code for Seismic Design of Buildings” and the “Standard for Seismic Test Methods of Buildings” to ensure that the seismic performance of the house meets the standards. In addition, measures such as reasonable site selection, scientific design, standardized construction, and regular inspections can further ensure the safety of cement prefabricated houses.