Analysis on the energy dissipation capacity and ductility of recycled concrete filled circular steel tube-profile steel composite columns under cyclic loading
Analysis on the energy dissipation capacity and ductility of recycled concrete filled circular steel tube-profile steel composite columns under cyclic loading
The cyclic loading tests were conducted on 11 specimens of recycled concrete filled circular steel tube-profile steel composite columns.The failure modes and characteristics of composite columns were observed,and the performance indicators such as the hysteresis curves,equivalent viscous damping coefficients,ductility coefficients,and the lateral displacement angles of composite columns were also obtained.The influence of parameters such as the replacement rate of recycled coarse aggregate,cross-sectional form of profile steel,axial compression ratio,steel ra-tio of profile steel and the diameter to thickness ratio of circular steel tube on the energy dissipation capacity and ductility of composite columns was also analyzed in detail.The results indicate that the composite column exhibits a typical failure mode of the compression bending plastic hinge under cyclic loading.The load-displacement hysteresis curves of composite columns are full and spindle shaped,with the equivalent viscous damping coefficients of com-posite columns between 0.30 and 0.48 after the yielding displacement.The average ductility coefficients of compos-ite columns are greater than 3.0,and the ultimate lateral displacement angles are between 1/30 and 1/20,both of which are greater than the standard limit value of 1/50,which comprehensively shows that the composite columns have good energy dissipation and ductility performance.In addition,the replacement rate of recycled coarse aggregate has a great impact on the energy consumption capacity and ductility of the composite columns,and the energy consumption of fully recycled concrete is reduced by 14.5%compared to ordinary concrete.Increasing the wall thickness of steel tube or profile steel ratio is beneficial for improving the energy consumption and ductility of composite columns,while increasing the axial compression ratio is detrimental to the ductility and deformation of composite columns.The composite column with the box shaped cross-sectional steel has the best energy consumption and ductility.Compared with the I-shaped section steel,the composite column with the box shaped cross-sectional steel has an increased energy consumption capacity and ductility by 23.5%and 51.9%,respectively.
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