Container House Bearing Capacity Calculation Document

The container house bearing capacity calculation document should include design basis, load values, calculation steps, core component verification, and overall stability and foundation connection calculations, as detailed below:

Design Basis and Code Sources
The structural calculations for container houses must strictly adhere to national codes, including the Steel Structure Design Standard (GB 50017), Building Structure Load Code (GB 50009), Technical Code for Cold-Formed Thin-Wall Steel Structures (GB 50018-2002), Code for Seismic Design of Buildings (GB 50011-2016), and Code for Design of Building Foundations (GB 50007-2011). These codes specify material properties, load values, calculation methods, and construction requirements, serving as the core basis for ensuring structural safety.

Basic Load Values
Load values should be determined based on the usage scenario:

• Roof: Dead load of 0.3 kN/㎡ (self-weight), live load of 0.5 kN/㎡ (maintenance, snow accumulation, etc.);
• Floor: Dead load of 0.5 kN/㎡ (finishing and fixed equipment), live load varies by use (2.0 kN/㎡ for residential/office use, 2.5 kN/㎡ for conference rooms/storage);
• Wind and Snow Loads: Basic wind pressure of 0.55 kN/㎡, basic snow pressure of 0.4 kN/㎡, adjusted according to regional climate conditions.

Calculation Steps

1. Load Combination: The partial factor method is used, with the basic combination formula for the ultimate limit state being:
   S = γG × SGk + γQ1 × SQ1k + Σ(γQi ×ψci × SQik)
   Here, the partial factor for permanent loads (γG) is 1.2, the partial factor for variable loads (γQ) is 1.4, and the combination value factor (ψc) is determined based on load correlation.
2. Section Verification: Load effects (bending moment, shear force, axial force) must be less than the design bearing capacity (R) of the component. For example, the flexural bearing capacity of a steel beam is M = f × Wn (where f is the design flexural strength of the steel, 215 N/mm² for Q235 steel; Wn is the net section modulus).
3. Deflection Verification: The deflection limit for floor beams is 1/250 of the span to ensure user comfort.

Core Component Verification

• Bottom Structure: The main beams are verified for overall stress using a continuous beam model, while the secondary beams are checked for flexural and shear strength and deflection using a simply supported beam model; the floor panels must meet local bearing requirements.
• Columns and Side Walls: The four corner columns are verified for axial compressive strength, stability, and slenderness ratio; the side wall frames and panels must resist wind loads, with a focus on verifying flexural and wind pressure resistance.
• Roof Structure: The purlins, main beams, and roof panels must withstand self-weight, snow accumulation, and wind suction negative pressure loads, with a focus on verifying flexural bearing capacity under snow accumulation conditions and anti-uplift capacity under wind negative pressure conditions.

Overall Stability and Foundation Connection Calculations

• Anti-Overturning and Anti-Sliding: For outdoor scenarios, the overturning and sliding moments under wind loads must be calculated, and stability requirements must be met through ballast, anchor bolts, or foundation anchoring.
• Foundation Connections: Anchor bolts must be verified for pull-out and shear bearing capacity to ensure a firm connection between the container house and the foundation, preventing detachment under strong winds or earthquake conditions.