Experimental study on axial compression of circular concrete-filled steel tubular short columns with recycled ceramic coarse aggregate
To make effective use of waste ceramics and investigate the mechanical properties of recycled ceramic coarse aggregate concrete(RCCAC)restrained by steel tube,the axial compression tests of 18 recycled ceramic coarse aggregate concrete-filled circular steel tubular(RCCACFST)short columns were carried out.The failure mode,bearing capacity and load-longitudinal strain curves were obtained.The effects of steel content,constraint effect coefficient and replacement rate of recycled ceramic coarse aggregate on axial compression properties of specimens were studied.The test and analysis results show that the failure modes of RCCACFST axial compression short columns are classified into shear failure,waist failure and mixed failure,which are affected by the steel content and constraint effect coefficient.The restraint effect of steel tube on RCCAC is better than that of control concrete.Compared with control concrete-filled steel tube,specimens with 100％replacement rate have higher improvement coefficient of bearing capacity,improvement coefficient of concrete strength,residual bearing capacity ratio and better ductility.By comparing the measured values of the test bearing capacity with the calculation results of the bearing capacity formulas for concrete-filled steel tube in the current codes of various countries,it is found that the predicted results of current codes are too conservative for the bearing capacity of the RCCACFST short axial compression columns.Combined with the test data,a simplified calculation formula for the bearing capacity of the RCCACFST short axial compression columns is derived,the predicted results agree well with the experimental results.
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