Earthquake Resistance Level of Prefabricated Assembly Houses

The earthquake resistance capacity of prefabricated assembly houses varies, roughly classified as being able to withstand earthquakes of magnitude 6 - 7 or 7 - 9, depending on the construction era, design standards, and construction quality. Some 'prefabricated houses' in rural areas claim to be able to withstand magnitude 8 earthquakes, but lack detailed regulatory support. Details are as follows:

Old prefabricated panel buildings from the 1970s - 1980s: These houses were mostly designed according to the 'Code for Seismic Design of Buildings' (TJ 11 - 78), with a general seismic fortification intensity of 6 - 7 degrees, and some areas (such as Beijing) designed for 7 degrees. Limited by the technology at that time, the component connection methods were relatively simple, mostly using steel bar overlaps or mortar joints, resulting in poor overall integrity and weak earthquake resistance of the houses. Under earthquake action, these houses are prone to component detachment and structural damage, and can withstand magnitude 6 - 7 earthquakes (corresponding to an intensity of 6 - 7 degrees), but when encountering earthquakes above magnitude 8, they basically cannot guarantee safety.

Modern prefabricated assembly buildings: Designed according to the current 'Code for Seismic Design of Buildings' (GB 50011 - 2010), the seismic intensity can reach 7 - 9 degrees depending on the fortification requirements of different regions. Modern prefabricated assembly buildings adopt advanced technologies and materials such as high-strength concrete, prestressed technology, and steel bar sleeve connections, greatly improving the overall integrity and seismic performance of the houses. For example, prefabricated shear wall structures can withstand earthquakes above magnitude 8 and can bear magnitude 7 - 9 earthquakes (corresponding to an intensity of 7 - 9 degrees), but the specific seismic capacity also depends on the design and construction quality.

Some cement 'prefabricated houses' in rural areas of Henan: Some employees of construction units claim that these houses can withstand magnitude 8 earthquakes, but currently lack more detailed regulatory basis for support. Self-built prefabricated houses in rural areas may have non-standard design and construction, making it difficult to accurately assess their seismic capacity. Their true seismic level cannot be determined solely based on the unilateral claims of the construction units.