Prefabricated House Earthquake Test
The prefabricated house earthquake test is an important experimental method for evaluating its seismic performance by simulating earthquake vibrations. Currently, numerous related tests have been carried out both domestically and internationally, primarily using shaking tables to simulate seismic waves to verify the safety and stability of structures under earthquakes of different intensities.
Research at the University of California, San Diego focuses on the seismic resistance of large prefabricated concrete buildings. Researchers constructed a three-story, one-million-pound prefabricated concrete building model with a structure similar to a parking garage. They applied earthquake vibrations up to magnitude 8.0 on the Richter scale using a shaking table. The test was divided into two phases: the initial phase lasted until the end of May, simulating the cumulative effects of earthquakes of different intensities; in June, the most intense vibrations were conducted to test the ultimate load-bearing capacity of the structure under extreme conditions. The core goal of this experiment is to improve U.S. building codes and provide a scientific basis for the design methods of next-generation prefabricated buildings. For example, by analyzing data such as crack propagation and displacement changes in the structure during vibrations, the connection methods of prefabricated components can be optimized or the seismic performance of key nodes can be enhanced.
The experiment by the Institute of Engineering Mechanics, China Earthquake Administration was conducted on a 3D-printed prefabricated concrete residential model. The experiment used the most advanced earthquake simulation shaking table in China, capable of simultaneously simulating horizontal and vertical vibrations as well as different types of rotations, more closely resembling the multidimensional effects of real earthquakes. The research team set up six working conditions (such as different earthquake magnitudes and focal mechanisms), conducting seven repeated tests under each condition to comprehensively observe the damage patterns of the house model under different earthquake scenarios. For example, under low-intensity earthquakes, only minor cracks may appear, while high-intensity earthquakes may cause component detachment or complete collapse. By comparing the test results under different working conditions, the seismic weaknesses of the residential model can be identified, providing data support for the standardized design of prefabricated residences.
Both types of experiments indicate that the seismic performance of prefabricated houses can be significantly improved through scientific testing and optimized design. The U.S. research focuses on improving seismic codes for large public buildings, while the Chinese experiment pays more attention to the universal design of residential buildings, jointly promoting the application and development of prefabricated buildings in earthquake-prone areas.
