Cyclic loading test of SHS columns under small amplitude loading history

摘要

In this study, a series of cyclic loading tests of SHS columns underrnsmall amplitude loading history was conducted. The followingrnconclusions were obtained.rn(1) In case of the loading history was constant displacementrnamplitude with 2.0θpc, the strength deterioration was governed byrnthe propagation of the cruck at weld toe, and if the amplitude wasrnlarger than 2.5θpc, the strength deterioration was governed byrnlocal buckling.rn(2) In the comparison using the extended skeleton curve, thernstrength deterioration due to local buckling under smallrndisplacement amplitude was smaller than that under incrementalrndisplacement amplitude.rn(3) The relationships between the strength deterioration and thernlocal buckling deformation shows similar trend regardless of thernloading history.