In fact, there are many more rectangular columns than circular columns. As far as mechanical properties are concerned, for columns that only bear axial force, circular is more material-saving than square; Rectangular columns are more economical for columns that bear both axial force and bending moment (most columns are in this stress state). But on the whole, there is not much difference. In the construction technology, circular column formwork is less, but the processing is complicated, and rectangular column formwork is easier to process, especially beam-column joints. From the architectural effect, most rectangular houses are suitable for using rectangular columns, which are handled better when connected with the wall. Cylinders are generally used in halls, independent columns, corridors, facades and other places with decorative effects.

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