SEISMIC TORSIONAL BEHAVIOR OF A TESTED FULL-SCALE STEEL BUILDING

Based on shaking experiment results of a full-scale 4-story steel building conducted on E-Defense – the world largest shaking table in Japan, the characterization of twisting behavior can be achieved. Exploration on twisting motion of the specimen building is presented in this paper, addressing global rotational responses in various increasing excitation levels. Study results show that the torsion movement of the building is mainly due to story mass eccentricity. On the other hand, the shaking-table also causes considerable influence on the building twisting response. System identification and mode superposition of response translational acceleration at floor mass centers are carried out. Some justifications for stiffness of non-structural are also presented, through which we can get a more precise basis to determine stiffness contribution of each component.