Aluminum Profile Prefabricated House
Aluminum profiles can be used to construct prefabricated house frames, but their applicable scenarios are limited and require comprehensive consideration of factors such as design, cost, and performance.
Applicable Scenarios and Structural Strength
Aluminum profiles (commonly using 6063-T5 or 6061-T6 aluminum alloys) have a density only one-third that of steel, with a tensile strength ranging from 150 to 300 MPa, which is lower than the 370 to 500 MPa of Q235 steel. Therefore, they are more suitable for low-rise, small-span structures such as light residential houses, sunrooms, small commercial buildings, or modular buildings (e.g., single-story villas, sunrooms with a span of ≤6 meters). For large or high-rise buildings, aluminum profiles need to compensate for their insufficient strength through complex cross-sectional designs (e.g., hollow ribs, stiffeners) and connection nodes (e.g., corner brackets, bolt connections). Additionally, stress analysis using structural calculation software (e.g., SAP2000) is required to ensure compliance with load requirements.
Corrosion Resistance and Maintenance Costs
Aluminum profiles naturally form an oxide film on their surface or can be treated with anodizing to resist atmospheric corrosion (with salt spray tests lasting over 1000 hours). In coastal or acid-alkaline environments, additional protection with powder coating or fluorocarbon coating (PVDF) is necessary. Compared to steel, which requires hot-dip galvanizing or coating for rust prevention, aluminum profiles have a maintenance-free period of up to 20-30 years, while ordinary steel frames require repainting every 5-10 years, resulting in lower long-term maintenance costs.
Thermal Insulation Performance and Energy-Efficient Design
The thermal conductivity of aluminum profiles (237 W/(m·K)) is much higher than that of steel (50 W/(m·K)), necessitating the use of thermal break designs (e.g., polyamide PA66 thermal strips) to reduce thermal bridging effects. Aluminum profiles with thermal strips that comply with the GB/T 5237 standard can control their heat transfer coefficient (K-value) within the range of 2.0-3.5 W/(m²·K), meeting building energy efficiency requirements. They can also be integrated with insulated glass (e.g., 5+12A+5 mm) to form lightweight, energy-efficient walls.
Cost and Construction Efficiency
As of the 2025 market situation, the price of 6063-T5 aluminum profiles for construction is approximately 25-40 yuan per kilogram (including processing fees), which is higher than the 5-8 yuan per kilogram for Q235 steel. However, due to their lightweight nature, aluminum profiles can reduce foundation construction costs by 15%-20%. Taking a 100 m² light residential villa as an example, the material cost for an aluminum frame is approximately 80,000-150,000 yuan, while that for a steel frame is about 30,000-60,000 yuan. However, the construction period for an aluminum frame is shortened by 30%-40%, and no subsequent rust prevention maintenance is required. In the long run (over a 25-year cycle), the total cost (including maintenance) of an aluminum frame can be saved by 10%-15%.
Construction Specifications and Safety Requirements
Construction must adhere to the GB 50429-2007 'Aluminum Alloy Structure Design Code' and the JGJ 145-2013 'Technical Specification for Post-Installed Fastenings in Concrete Structures'. Key steps include foundation leveling, column installation, and beam connection. Aluminum profiles require lightning protection grounding design (with a grounding resistance of ≤4 Ω for a single column), and in strong earthquake zones (with a seismic design intensity of ≥8 degrees), dampers or flexible connection nodes should be used.
