Design Specifications for Container Houses

The design specifications for container houses cover multiple aspects, as detailed below:

1. Adherence to Design Standards
   Strict compliance with the 'Unified Standard for Reliability Design of Engineering Structures' (GB 50153) is required. This involves specifying the importance coefficient of the structure within its design service life to ensure safety and durability throughout the entire lifecycle of the house. For instance, if the design service life is 25 years, relevant parameters must be adjusted according to the standard to meet actual needs.

2. Load Calculation Specifications
   Load calculations must conform to the 'Building Structural Load Code' (GB 50009). When the design service life is 25 years, the standard values for wind and snow loads can be taken based on a 50-year return period, but must be reduced by a factor of 0.9. This adjustment aims to balance safety and economy, avoiding over-design.

3. Structural Calculation and Construction Specifications
   Structural calculations must comply with the 'Steel Structure Design Code' (GB 50017), the 'Technical Code for Cold-Formed Thin-Wall Steel Structures' (GB 50018), and the 'Code for Seismic Design of Buildings' (GB 50011). Container modular houses should adopt a regular layout to ensure symmetrical planar arrangement of lateral force-resisting components (such as walls and frames) and uniform variation of lateral stiffness along the vertical direction, thereby enhancing seismic performance.

4. Box Panel Wall Opening and Cantilever Arrangement
   When creating openings, a staggered arrangement of non-perforated and perforated boxes should be used to avoid local stress concentration. The length of cantilevered container sections should not be excessive, and openings are prohibited in cantilevered areas to prevent structural instability or a decrease in load-bearing capacity.

5. Structural System and Connection Nodes
   The structural system must be reasonably designed to ensure strength and stiffness during transportation, installation, and use. The construction of connection nodes should facilitate ease of construction. Non-load-bearing panels require verification and reinforcement, while load-bearing roofs necessitate the installation of separate lightweight roof covers (such as color steel plates) to prevent structural deformation due to excessive roof loads.

6. Fire Protection and Corrosion Resistance Requirements
   The design documents must specify the fire rating (such as fire resistance limit) and corrosion resistance measures (such as painting and galvanizing). Existing containers should meet the maintenance standards outlined in the 'Technical Requirements for Repair of Steel General-Purpose Containers' (GB/T 12418). Container beams and columns must not be defective, and corner fittings must be intact and reliably connected to prevent safety hazards caused by fire or corrosion.

7. Steel Material Requirements
   The steel used for container structures must comply with the provisions for welded weathering steel in the 'Weathering Structural Steel' (GB/T 4171) to adapt to outdoor environments. Non-container components (such as connectors and reinforcements) may use steel from the 'Carbon Structural Steel' (GB/T 700) or 'Low-Alloy High-Strength Structural Steel' (GB/T 1591) standards, balancing strength and cost.

8. Corner Fitting Material and Performance
   The material and performance of corner fittings must comply with the 'Series 1 Container Corner Fittings' (GB/T 1835). Their design values for tensile, compressive, and flexural strength are 180N/mm², and for shear strength, it is 105N/mm². As critical connecting components, the performance of corner fittings directly affects the overall structural stability.