Calculation method of shelf column bearing capacity

1. The cross-sectional geometric dimensions (collection width, sheet thickness) of shelf columns, beams, supports and other components are much smaller than their length dimensions. For example: the cross-sectional dimensions of shallow shelf columns range from 30×30mm to 150×120mm. The length of its nodes ranges from 300mm to 1200mm, and the basic ratio is more than 10 times; the aspect ratio of the support is larger, sometimes more than 100 times, so the components in the shelf structure can be used as rods to simplify processing.

2. The connection method between the columns and beams of the assembled shelves can be regarded as a semi-rigid connection, which is generally handled in the form of a hinge. In fact, hinge nodes are the main node method in assembled rack steel structures. Some rigid node considerations are required for welded rack systems. Theoretically, under any load effect, the geometric shape and position of the rack steel structure will change if the deformation of the rods is not taken into account. If all remain unchanged, the shelf structure can also be simplified to a steel frame structure or a truss structure. This is also the mechanical basis for the shelf steel structure to be analyzed and processed using finite elements.

3. The steel structure of the shelf is basically a statically indeterminate structure. Due to the large deformation of some structural components, it is necessary to add constraints through the statically indeterminate structure, and convert the internal force calculation problem of the statically indeterminate structure into each individual through certain structural simplification methods. The internal force calculation problem of the "rod" group.