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Experimental study on ductility and bearing capacity of concrete frame columns with central reinforcement under high axial compression ratio

GUO Junqing,LEI Zixue,CHEN Penglang,ZHOU Tianhua(School of Building Engineering,Chang'an University,Xi'an 710061,China)  
Through the model test to eight concrete frame columns with central reinforcement and one general concrete frame column under high axial compression ratio and cyclic lateral loading,this paper described the major experimental phenomena and failure patterns,studied the test results of each specimen,including P-Δ hysteric loops,displacement ductility coefficient,ultimate displacement rotation,yield load,ultimate load,etc.The factors affecting the ductility and bearing capacity of concrete frame columns with central reinforcement were analyzed.The results show that,with reasonable arrangement of the core column concrete,frame columns with central reinforcement have excellent ductility and higher bearing capacity;seismic behavior of general concrete frame columns can be improved remarkably by central reinforcement so that their elasto-plastic deformation capacity can satisfy the seismic demands.The cross section area,longitudinal reinforcement ratio and volumetric tie ratio of the core column are the major factors affecting both ductility and bearing capacity of concrete frame columns with central reinforcement.In combination with past research results,this paper recommended the limit values of axial compression ratio,the formulas for calculating normal section bearing capacity and related design requirements of concrete frame columns with central reinforcement.
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