2021 Volume 21 Issue 5 Pages 5_79-5_97
We identified the story stiffness and damping from a shaking table test of 5-story steel building with various dampers, considering the rocking motion of the table. The identification method is based on the first modal response of substructures successively truncated at lower stories from the top. This method was verified by comparing shear-force vs story-drift relation obtained by measurements and the identification. Neglecting the rocking motion of the table in the identification process, smaller story stiffness and larger story damping can be erroneously evaluated. In the 5-story steel building model case, the complex damping was better to explain the second peak of the transfer function than viscous damping.
