On the rotation capacity of structural steel circular hollow sections in plastic analysis

摘要

In BS5950. Part 1, Structural use of steelwork in building. British Standards Insti- tution, 1990), it is recommended that in order to analyse a structure by plastic methods the section classification of its members must be "plastic". This condition is necessary so that ";large" rotations can be attained without local buckling of the member. For tubular members of circular hollow section the ratio of D/t must be ≤40ε2 for plastic classification.