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http://dx.doi.org/10.12989/scs.2018.29.4.451

Seismic performance of mixed column composed of square CFST column and circular RC column in Chinese archaized buildings  

Xue, Jianyang (College of Civil Engineering, Xi'an University of Architecture and Technology)
Zhou, Chaofeng (College of Civil Engineering, Xi'an University of Architecture and Technology)
Lin, Jianpeng (College of Civil Engineering, Xi'an University of Architecture and Technology)
Publication Information
Steel and Composite Structures / v.29, no.4, 2018 , pp. 451-464 More about this Journal
Abstract
This paper presents some quasi-static tests for 4 mixed columns composed of CFST column and RC column. The seismic performance and failure mode were studied under low-cyclic revised loading. The failure mode was observed under different axial compression ratios. The hysteretic curve and skeleton curve were obtained. The effects of axial compression ratio on yield mechanism, displacement ductility, energy dissipation, stiffness and strength attenuation were analyzed. The results indicate that the failure behavior of CFST-RC mixed column with archaized style is mainly caused by bending failure and accompanied by some shear failure. The axial compression ratio performs a control function on the yielding order of the upper and lower columns. The yielding mechanism has a great influence on the ductility and energy dissipation capacity of specimens. Based on the experiment, finite element analysis was made to further research the seismic performance by ABAQUS software. The variable parameters were stiffness ratio of upper and lower columns, axial compression ratio, yielding strength of steel tube, concrete strength and rebar ratio. The simulation results show that with the increase of stiffness ratio of the upper and lower columns, the bearing capacity and ductility of specimens can correspondingly increase. As the axial compression ratio increases, the ductility of the specimen decreases gradually. The other three parameters both have positive effect on the bearing capacity but have negative effect on the ductility. The results can provide reference for the design and engineering application of mixed column consisted of CFST-RC in Chinese archaized buildings.
Keywords
mixed column composed of CFST-RC; archaized buildings; experimental research; seismic performance; finite element analysis;
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