Abstract：The real-time dynamic substructure tests of the shaking table are performed, including four structural systems: regular steel moment-resisting frame (R-SMRF), irregular steel moment-resisting frame (Ir-SMRF), regular steel moment-resisting frame considering soil structure interaction (R-SMRF-SSI), and irregular steel moment-resisting frame considering soil structure interaction (Ir-SMRF-SSI). The influence of mass irregularity and soil-structure interaction on the seismic collapse resistance of low-rise steel frame structure is evaluated. It is noted that whiplash effect leads to increase of acceleration response of the top story in minor earthquake. In contrast, medium earthquake cause structural damage, so the equipped-mass reduces the acceleration response. The foundation significantly reduces acceleration response of structure because the natural period of structure system increases. As the seismic intensity increases, displacement response of structure increases. Damage and residual deformation of structure occurs during medium earthquake, and structure eventually collapses due to lateral displacement of the first storey in the rare earthquake. The foundation has a damping effect, but the equipped-mass is not conducive to for the seismic resistance of the structure.
