Four-Story Container House
A four-story container house is a multi-story building structure formed by the crisscross stacking and combination of multiple specialized building containers, typically utilizing a high-strength steel frame and composite enclosure structure, combined with seismic-resistant connection node design to achieve stability and functionality.
I. Structural Combination Method
The core of a four-story container house lies in modular stacking technology. Taking a certain large black container building as an example, it is composed of 16 specialized building containers stacked in a crisscross manner to form a four-story three-dimensional structure. This design requires precise calculation of the load-bearing capacity and stacking sequence of each container, often employing staggered stacking to disperse loads and enhance overall stability. For instance, in some cases, the bottom-layer containers may be arranged horizontally as a foundation, while the upper-layer containers are inserted vertically, forming a support system similar to a '井' (Chinese character meaning 'well') shape.
II. Material and Structural Reinforcement
To support a height of four stories, the main frame of the container must be made of high-strength steel. For example, Yiqi Company uses Q355B grade weather-resistant steel, whose yield strength is approximately 30% higher than that of ordinary carbon steel, enabling a single container with a length-to-width ratio close to 2:1 to form a self-balancing system through rigid connections between corner fittings and side beams. Additionally, the top longitudinal corrugated plate disperses stress through its corrugated geometric shape, avoiding local buckling and reducing the need for additional reinforcement members, thereby decreasing material usage by 15%. The enclosure structure adopts a three-layer composite construction of 'rock wool-air layer-aluminum-zinc coated steel plate', with a rock wool layer thickness of 75-100 millimeters and a thermal conductivity below 0.040 W/(m·K). Combined with a 5-millimeter air layer to suppress convective heat transfer, the overall heat transfer coefficient (U-value) is below 0.5 W/(m²·K), adapting to low-temperature environments and extending the lifespan of the steel structure.
III. Seismic and Connection Design
To meet the seismic requirements of multi-story buildings, the connection nodes of the containers must possess high strength and flexibility. For example, Yiqi Company introduces a dual-fixing mode of 'wedge lock + high-strength bolt' at the container connections. The wedge lock is made of 45# steel through heat treatment, with a slope angle of 15 degrees, capable of producing a self-locking effect under horizontal shear forces. Shaking table tests show that the displacement of this node is controlled within 3 millimeters under simulated 8-degree rare earthquakes, with a deformation amplitude approximately 40% better than that of conventional welded nodes. This detachable connection method also facilitates secondary relocation and repeated assembly, reducing construction waste generation.
