Experimental study on eccentric compression bearing capacity of circular steel tube recycled concrete long column
With eccentricity as the main variable parameter,eccentric compression monotone loading tests were carried out on 6 circular steel tube recycled concrete long columns.The failure forms of the specimens were observed through test,the load-longitudinal displacement curves,load-longitudinal strain curves and ductility were analyzed,and the influence of eccentricity on the bearing capacity of the specimens was studied.The results show that,under eccentric load,the circular steel tube recycled concrete long column has experienced the elastic stage,the elastoplastic stage and the bearing capacity decline stage successively,and has good ductility.The failure is mainly manifested as the buckling of the steel tube wall,which leads to the whole instability failure of the specimen.The bearing capacity and longitudinal deformation of the specimen decrease with the increase of eccentricity.It is suggested to use the Technical specification for concrete-filled steel tube structures(GB 50936-2014)and the Design specification for composite structures(JGJ 138-2016)to calculate the bearing capacity of the circular steel tube recycled concrete eccentric compression long column.
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