Stress-strain model of recycled coarse aggregate concrete with manufactured sand in steel tubular short columns
In order to investigate the stress-strain relationship of manufactured sand recycled coarse aggregate concrete(MSRAC)-filled steel tubular,an axial compression test is conducted on 18 MSRAC-filled steel tubular short columns,examining the stress-strain relationship development laws in both steel and concrete components.The mechanical sandstone properties(limestone,pebbles),concrete strength,and steel ratio are taken as the investigation parameters.Based on the deformation compatibility condition between the steel tube and concrete,taking into account the interaction between steel and concrete,mechanical properties of the specimens are analyzed.The stress-strain relationship of core concrete is subsequently obtained.A stress-strain relationship model of core MSRAC is obtained and compared with experimental results.The results show that the stress-strain relationship model proposed has a good agreement between the calculated curve and the experimental curve,with the average and coefficient of variation of the ratio of calculated and experimental values being 1.005 and 0.052,respectively.This verifies the accuracy of the constitutive model for MSRAC confined by the steel tube.
concrete-filled steel tubular short columnsexperimental studymanufactured sand recycled coarse aggregate concreteconstitutive model of core concrete
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