Prefabricated House: Wind and Earthquake Resistance
Prefabricated house products exhibit remarkable characteristics in wind and earthquake resistance, with different types of houses achieving efficient protection through structural design and material optimization. The following is an analysis of three typical products: assembled concrete houses, light steel villas, and aluminum alloy steel structure houses.
Assembled concrete houses use high-strength skeletons and integral pouring techniques as their core to provide dual protection against earthquakes and wind. They adopt a "full-frame shear wall" design, using national standard threaded steel bars to construct the skeleton and C35 concrete for integral pouring. Each module weighs over 20 tons, with wall thicknesses ranging from 150 to 200 mm and floor thicknesses of 120 mm. This structure enhances earthquake resistance by increasing mass and stiffness. Tested by professional institutions, it can withstand an 8-magnitude earthquake (with a designed seismic fortification intensity of 7 degrees), with wall crack widths controlled within 0.2 mm and no damage to the main structure. In terms of wind resistance, the modules are connected using prestressed bolts, ensuring no loosening under a 12-level typhoon (with wind speeds of 32.7 to 36.9 m/s). The roof waterproofing membrane remains intact due to the enhanced structural integrity. Its core advantage lies in forming a stable force-bearing system through high-density materials and rigid connections, making it suitable for high-intensity earthquake zones and areas with frequent strong winds.
Light steel villas achieve an earthquake-resistant mechanism of "flexibility overcoming rigidity" through flexible structures and the diaphragm effect. They adopt a cold-formed thin-walled steel structure system, which is lightweight (about 1/3 to 1/5 of the weight of traditional concrete structures) and has good ductility. During an earthquake, the light steel keels absorb seismic energy through flexible connection nodes, avoiding the brittle failure common in rigid structures. Wind resistance relies on the truss-type wall structure and the diaphragm effect of OSB boards: the truss-type walls disperse wind loads through triangular stable structures, and the OSB boards form an overall force-bearing system similar to a box when covered, enabling resistance to a 12-level typhoon. Such houses are suitable for geologically active areas and coastal regions with frequent winds, and their lightweight design also reduces transportation and installation costs.
Aluminum alloy steel structure houses meet both wind and earthquake resistance requirements through material lightweighting and structural redundancy design. Taking the VESSEL micro-accommodation space capsule as an example, it uses an aluminum alloy shell and earthquake-resistant steel structure. Aluminum alloy has a low density but high strength, while the steel structure provides core support. The combination not only reduces the overall weight but also ensures structural stability through redundancy design. The aluminum alloy shell can resist strong wind impacts, and the steel structure disperses seismic energy through optimized nodes, making it suitable for complex environments such as mountains and islands. The core value of such houses lies in the collaborative optimization of materials and structures, achieving a balance between lightweighting and high strength.
In conclusion, prefabricated houses enhance their wind and earthquake resistance through structural innovations (such as frame shear walls, flexible connections, and the diaphragm effect) and material upgrades (high-strength concrete, cold-formed thin-walled steel, and aluminum alloy). Users can choose the appropriate type based on usage scenarios (earthquake intensity, wind speed levels) and cost requirements.
