The roof did not have any significant structural contribution
when subjected to vertical point loads (Loading Scenarios 1–3).
When subjected to the vertical point loads from Loading Scenarios
2 and 3, the original container model M1 had lower maximum applied
forces compared to the other container models. When all four
walls were present in the container model (M1 and M4), a localized
yield stress in the door header may have occurred resulting in a reduced
maximum applied force compared to the other container
models. Further FEA modeling may be necessary to determine
the causes of localized yield stress in the door header, as calculated
from the analytical model in this research.
For Loading Scenario 4 (Fig. 16) the container models with end
walls (models M1, M2, M4, M6, and M7) had higher maximum applied
forces and were significantly stiffer than container models
without end walls (M3, M5, and M8). The end walls under Loading
Scenario 4 were the critical lateral load resisting components. The
lateral capacity of the sidewalls and roof component was very limited,
and the roof component provided little resistance without
wall components (models M5 and M8). Only the complete model
(M1) reached the maximum elastic load of 150 kN listed in ISO
1496-1 (Fig. 3).