Disadvantages of Prefabricated Frame Structure Houses
The disadvantages of prefabricated frame structure houses mainly include limitations in seismic and structural performance, poor sound insulation and thermal insulation, difficulty in internal structural adjustments, construction complexity and cost issues, as well as risks of water leakage and durability.
1. Limitations in Seismic and Structural Performance Prefabricated frame structure houses have relatively small lateral stiffness and belong to flexible structural systems. Under strong earthquake action, their horizontal displacement amplitude is large, making them prone to damage to non-structural components (such as partition walls and decorative layers), and even causing overall structural instability. Although steel reinforcement is added to the prefabricated components to enhance connections, their overall seismic capacity is still significantly lower than that of cast-in-place concrete structures or steel structures, especially in areas prone to geological disasters, where safety precautions are clearly inadequate.
2. Poor Sound Insulation and Thermal Insulation The walls and floors of prefabricated panel houses are usually made of lightweight materials, which have poor thermal insulation and sound insulation properties. In summer, indoor temperatures are easily affected by external high temperatures, while in winter, it is difficult to retain heat, leading to increased energy consumption. At the same time, sounds from neighbors are clearly transmitted, resulting in poor privacy and directly affecting living comfort. This defect is closely related to the splicing method and material density of the prefabricated components and is difficult to solve through simple modifications.
3. Difficulty in Internal Structural Adjustments The walls and floors of prefabricated frame structures are mostly prefabricated in factories and then assembled on-site, with various components connected through fixed nodes to form an overall load-bearing system. Therefore, modifications to the internal space (such as removing walls and adjusting layouts) may damage the structural stability and even pose safety hazards. Residents find it difficult to make large-scale changes to the house according to personalized needs, with flexibility far lower than that of traditional brick-concrete structures.
4. Construction Complexity and Cost Issues The construction of prefabricated frame structures requires multiple lifting operations of components, with a large workload for joint treatment and cumbersome procedures, placing high technical requirements on workers. In addition, construction is significantly affected by seasons and weather (such as water accumulation at component connections during the rainy season), which may delay the construction schedule. Under ordinary geological conditions, if raft foundations and frame structures are blindly adopted (such as for low-rise houses), costs may increase significantly: raft foundations cost about 20,000 yuan more than strip foundations, and frame structures cost about 40,000 yuan more than brick-concrete structures, resulting in poor economic efficiency.
5. Risks of Water Leakage and Durability Cracks are prone to occur at the joints of prefabricated components due to material shrinkage or construction errors. Over time, these cracks may expand, leading to rainwater leakage and damage to interior decoration and structural safety. Some prefabricated panel houses have a relatively short design life (about 30-50 years). After approaching or exceeding their service life, problems such as component aging and steel bar corrosion become prominent, requiring additional funds for maintenance or reinforcement.
