Theoretical Study And Finite Elementanalysis On The Lateral Stiffness Of Container House Based On The Energy Theory

Container is a kind of skin structure, which has remarkable differences with the ordinary steel frame. Its side panel and steel frame are welded, and there is a large stiffness in the plane, which can effectively control the lateral displacement of the container and improve the lateral stiffness. Therefore, the key to the study of the lateral stiffness of container is to analyze its skin effect. However, it is not easy to determine its theoretical calculation. Different from the common stressed skin diaphragm with bolt connection, the side wall of the container is completely welded around with the rigid frame. The interaction between them is very complicated, we cannot directly use the traditio nal skin structure theory. In addition, when a concentrated force acts on the top of the container, there will be obvious local effect, which means that the deformations caused by uniform load and concentrated load are not equivalent. This does not conform to the rigid floor assumption of the ordinary high-rise structure, so we cannot reference the lateral displacement calculation principle of the traditional framework or shear wall structure.Based on the energy theory, combined with the ABAQUS finite elem ent numerical simulation, the research on the calculation theory of the lateral stiffness of the container housing is carried out and a set of more accurate and comprehensive calculation theory of lateral stiffness is obtained. The main content can be summarized as the following aspects:The deformation components of the container under uniform distributed load are analyzed, and the mechanical model is simplified. Based on the energy theory, the pure shear strain energy and twist strain energy of the side corrugated plate are derived respectively, and then get the calculation formula of the ideal lateral stiffness of the container under uniform distributed load. By using the ABAQUS finite element software to establish the model of the container, the formula for calculating the lateral stiffness is verified.Research on the local deformation of container under concentrated force is performed. According to the ABAQUS finite element simulation, the interaction force distribution between the side plate and the beam is obtained, then the reinforce effect of the side plate is derived. Based on the energy theory of structural mechanics, the equivalent elastic modulus of the roof is analyzed, and the reinforce effect of the top plate is deduced. The calculation formula of the lateral stiffness of the container under the concentrated force is finally got.The ABAQUS finite element simulation is verified by the experimental data of the project group. Through the finite element simulation, the difference between the lateral stiffness of the multi point load and the uniformly distributed load is analyzed, which provides a reference for the design of the container structure in the practical engineering.The impact on the lateral stiffness caused by side panel with openings is analysed. To begin with, based on the stressed skin theory of European, the reasonable forms of openings on container’s side plate is limited. Then the corresponding stiffness reduction factor of the container structure with the openings which meet the limitations is derived. The theory and and the effect of reinforcement around the openings is verified by ABAQUS finite element simulation and the two conditions which most likely not meet the limitations(the height of window and the position of door) is studied. Finally, the method of finite element simulation is verified by the experimental data of the project group.