In this paper, a wide-ranging experimental program on members constructed from high strength concrete and high yield steel is described. The main objective was to investigate the applicability of existing and established seismic design concepts to concrete of compressive strength of up to 130 MPa and steel with yield up to 1300 MPa. The investigation is focused on the material and member level; the structure-level implications are investigated by the authors in other publications. The testing programme comprises 90 column models with constant axial force and cyclic transverse displacement-controlled loading. A detailed account of the testing compaign and overall results are given in the paper. Three specimens are selected, representative of the range of concrete compressive strength used, are reported in detail. The main conclsions from the presented study are that existing seismic design deformation-based concepts are applicable, with exceptions. Perhaps the most important observation pertains to the role of stirrups in high strength members. Recommended target ductility as a function of axial force and member characteristics are given in the paper alongside comprehensive guidance on deformational seismic response parameters |
