Structural Calculation Book for Container Houses
The structural calculation book for container houses should cover project overview, design basis, load calculation, structural materials, connection methods, other structures, structural verification, and other matters. Here is a detailed explanation:
Project Overview: It is necessary to clarify the purpose, number of floors, area, and geographical environment. For example, if used as a temporary office, it is a single-story building with dimensions of 6 meters in length × 2.4 meters in width × 2.6 meters in height, constructed in the eastern coastal region.
Design Basis: Design is carried out in accordance with specifications such as the 'Code for Design of Steel Structures', 'Technical Specification for Cold-Formed Thin-Wall Steel Structures', 'Load Code for the Design of Building Structures', 'Code for Seismic Design of Buildings', 'Technical Code for Building Foundation Design', 'Code for Welding of Steel Structures', and 'Technical Specification for High-Strength Bolt Connections in Steel Structures'.
Load Calculation:
- Wind Load: Determine the value based on local meteorological data and specifications. For example, 0.5 kN/m², with a partial coefficient of 1.5 for the combination coefficient.
- Dead Load: Floor self-weight is 0.3 kN/m², equivalent load of internal office furniture is 2 kN/m², and roof self-weight is 0.15 kN/m².
- Live Load: Set to 2 kN/m².
- Seismic Load: Adjust the structural importance coefficient according to the seismic fortification intensity of the region. For example, with a fortification intensity of 7 degrees, the coefficient is 0.9, and the total horizontal seismic action at the bottom is calculated using the base shear method.
Structural Materials: Use galvanized corrugated steel sheets with a grade of Q235, a yield strength of 235 MPa, and a flexural strength of 215 MPa; cold-formed thin-wall C-section steel is used for the structural steel keels, with specifications of C80×40×15×2.0 and column spacing of 1.2 meters.
Connection Methods: The splicing joints are connected with shear bolts of strength grade 8.8, with a design torque value of 210 N·m.
Other Structures: The floor is made of 20 mm thick plywood, and the ceiling is made of 100 mm thick rock wool sandwich panels; if denser pine flooring is used instead of plywood, the main beam section needs to be strengthened.
Structural Verification: Includes deflection of beams, compressive stability of columns, strength of connecting bolts, stress at joints between keels and bolts, and extreme value testing at container corners, all of which must meet specification requirements.
Other Matters: Handle dimensional errors in the splicing gaps of containers and confirm that the zinc coating thickness of the sheets meets standards; during completion acceptance, the supervision unit inspects the weld quality of main components, and relevant information is recorded in the structural sign-off documents; optimize the construction process, and the ground concrete foundation strength should not be lifted until the 28th day after the issuance of the C25 test block report.
