Shaking table test of connected structure with large-span special-shaped steel corridor

In order to study the seismic performance of connected structures with large-span special-shaped steel corridor in high seismic intensity regions, one 1/30 scaled model structure was tested on the shaking tablet. The failure characteristics, dynamic properties, accelerations, displacements and the strains of the model structure were analyzed through 33 loading processes. The experimental results show that under the frequent and moderate intensity levels of degree 8, the connected structure suffers no significant damage and its natural frequency does not change obviously indicating it remains nearly elastic. As the increase of the ground motion intensity, damage gradually accumulated, the natural frequency descended, and the acceleration amplification factors of the main building as well as the affiliated building I decreased accordingly. And small cracks occurred at the junction of the steel corridor and the affiliated building I. The vertical acceleration amplification factor of the steel corridor in the mid-span first decreased and then increased. The vertical vibration of the steel corridor was amplified obviously with obvious torsion effect. Under the rare intensity level of degree 8, some cracks occurred in the shear wall and the frame columns of the main building and the affiliated building I. Damage at the junction between the steel corridor and the affiliated building I continued to aggravate. And the vertical frequency of the steel corridors decreased nearly 3.37%. The weak part of the connected structure exists at the junction betweenthe steel corridor and the affiliated building I, in which anchoring damage occurs. The inter-story drift ratios of the connected structure do not exceed the limit of the current seismic code, and the requirements of no damageand no collapse can be met when under frequent and rare seismic intensity levels. © 2019, Editorial Office of China Civil Engineering Journal. All right reserved.