Computer program for determination of geometrical properties of thin-walled beams with open–closed section

A computer program is developed for the determination of the torsional and flexural properties of thin-walled beams with arbitrary open–closed cross-section. Graph theory is employed to establish the topological properties of multi-cellular cross-section, i.e., to automatically define independent circuits and corresponding fictitious cuts that make section open. Numerical examples calculated by the program are given in the paper.