Is the Seismic Performance of Concrete Prefabricated Houses Good?

The seismic performance of concrete prefabricated houses depends on specific circumstances and cannot be generalized.

Impact of Construction Era and Standards: Concrete prefabricated houses built in the early period (before 1990) mostly followed the old seismic standard TJ11-78. Due to the lack of core seismic components such as structural columns and ring beams, they were prone to issues like slab joint cracking and prefabricated slab detachment during earthquakes, resulting in relatively weak seismic performance. However, the GBJ11-89 standard and subsequent standards implemented after 1990 explicitly require that prefabricated slabs must be reinforced with cast-in-place composite layers, prohibit pure bare laying, and mandate the installation of closed ring beams on each floor and structural columns at the four corners and stair corners. These measures have significantly improved the seismic performance of houses.

Construction Quality and Regulatory Standards: The seismic performance of concrete prefabricated houses is also closely related to construction quality. If the design is modified without authorization or shoddy work is carried out during construction, such as reducing the number of structural columns and ring beams, using concrete with insufficient strength, or shortening the curing time, the seismic performance of the house will be reduced. At the same time, current regulations mandate seismic fortification to ensure that houses meet seismic requirements, which is also an important factor in safeguarding the seismic performance of houses.

Structural Type and Usage Scenarios: Some concrete prefabricated houses adopt a reinforced concrete structure, with high-strength mortar used to fill the module joints. However, experts point out that this type of modular prefabricated structure has slightly weaker seismic performance compared to cast-in-place houses. In non-seismic zones, such houses can meet the requirements, but the number of floors should not be too high; otherwise, it will be difficult to meet the seismic design requirements of building structures. Therefore, when choosing concrete prefabricated houses, it is necessary to comprehensively consider the specific usage scenarios and seismic requirements.