Seismic behavior tests on special-shaped CFT mega bifurcate columns coupled with multiple cavities under different direction horizontal loading

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (18) : 78-85.

WU Haipeng1,2,CAO Wanlin1,DONG Hongying1,YIN Fei1,LI Xiangyu1

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Abstract

In order to study the seismic behaviors of special-shaped CFT mega bifurcate columns coupled with multiple cavities in different cross sectional direction, five specimens were tested under a twice repeated horizontal low cyclic load.In the tests, three types of loading directions were considered, including long axial, short axial and 45 degree directions.And there are two types of joint core region constructions including a basic one and an enhanced one by increasing the quantity of steel tube cavities.The test results show that the arrangement of welding seams leads the failure trend under accumulated damage.The failure features appear as steel plate tearing caused by crazing and extending of welding seams at the lower horizontal partitioning steel plate of lower columns.The specimens in long axis possess higher bearing capacity, stiffness, deformability and energy dissipating ability than those in short axis, while the specimens in 45 degree directions take the middle seismic performance.The enhanced construction can increase bearing capacity, stiffness and energy dissipating ability in some degree.The bearing capacity degradation is slight under the same repeated load.The upper columns are the main parts of deformation and energy dissipation, and the proportion is between 60% and 70%.Each specimen possesses good elastic-plastic deformability, and can be used in the seismic design of mega frame structures in super high-rise buildings.

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special-shaped cross-section / CFT coupled with multiple cavities / bifurcate columns / loading directions / enhanced construction

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WU Haipeng1,2,CAO Wanlin1,DONG Hongying1,YIN Fei1,LI Xiangyu1. Seismic behavior tests on special-shaped CFT mega bifurcate columns coupled with multiple cavities under different direction horizontal loading[J]. Journal of Vibration and Shock, 2018, 37(18): 78-85

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