Ductility of thin-walled members

摘要

The study of ductility for thin-walled members finally reduces to the analysis of local plastic mechanisms for steel plates subjected to in-plane compression.The type of mechanism determines the rigid-plastic curve shape of the plate,which is important for estimating the ductility of thin-walled members.In evaluating the plastic rotation capacity three types of possible mechanisms are studied: pyramid,roof and flip-disc shapes mechanisms.A computer program named DUCTROT TWM was elaborated by the authors for reapidly determine the ultimate rotation and the ductility of a thin-walled section.Comparison with the experimental results showed that the obtained theoretical rigid-plastic curves can be used to draw the framework around the actual behaviour of thin-walled members.A rotation capacity of about 1.7 can be seismic design.