A study on the seismic performance of concrete-filled steel tube column-steel shelf-concrete core tube structures

ZENG Fanliang1,HUANG Yansheng1,ZHOU Jing2

Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (12) : 190-197.

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PDF(3388 KB)
Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (12) : 190-197.

A study on the seismic performance of concrete-filled steel tube column-steel shelf-concrete core tube structures

  • ZENG Fanliang1,HUANG Yansheng1,ZHOU Jing2
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Abstract

Taking an actual concrete-filled steel tube (CFST) column-steel frame-reinforced concrete (RC) core-tube hybrid structure as a reference engineering, a CFST column-steel shelf-core tube prototype structure was designed by changing the rigid joint of the steel frame beam to the column or core walls to the bolted joint. A 1/40 scaled model structure was constructed and performed the shaking table tests. The damage phenomena, dynamic characteristics, maximum lateral displacement, maximum inter-story drift angle, maximum torsion angle, seismic inertial force, story shear force, overturning moment and ductility demand of the structure were studied. The experimental results shows that the damage occur at the connection between the concrete slab and the column on the lower story, the connection between the concrete slab and the core wall, the connection between the concrete slab and the steel beam, and the corner concrete of the core tube walls. The basic natural vibration periods and damping ratios increase with the increase of the seismic damage, and the dynamic amplification effect decrease. The long-period ground motion response is more significant. The maximum inter-story drift angle of the core tube is 1/26, which exceeds 3.8 times of the collapse limit for the frame-core tube structure system, but the model structure has no collapse. The torsion stiffness of the outer steel shelf is small, and the structural torsion response is dominated by the core tube. The earthquake inertia force and story shear force of the structural damage are less affected by the long-period motion components. The ductility demand of story has a large differences.

Key words

CFST column-steel shelf-concrete core tube structure / bolted joint / shaking table test / seismic behavior

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ZENG Fanliang1,HUANG Yansheng1,ZHOU Jing2. A study on the seismic performance of concrete-filled steel tube column-steel shelf-concrete core tube structures[J]. Journal of Vibration and Shock, 2020, 39(12): 190-197

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