Experimental Performance Research On The Short Concrete Columns With HRB600 High Strength Stirrup

As a kind of high strength steel,HRB600,which has been developed independently in our country,has a wide application prospect in engineering field.At the same time,in the engineering practice,due to various factors,the short column appears constantly.Used HRB 600 high steel as stirrup configuration in the concrete short columns to enhance the stirrup binding for concrete is a more feasible method.Currently,the domestic research on configuration HRB600 high steel reinforced concrete short columns is still blank.Therefore,it is necessary to carry out a systematic research to expand the scope of its application.With 6 configuration of HRB600 high-strength stirrup concrete short columns of quasi static loading test,the failure characteristics,bearing capacity,displacement ductility,hysteretic curve,skeleton curve,stiffness degradation and ultimate bearing capacity of the low cycle repeated load were analyzed.Based on the research of strength stirrups,spacing of stirrups and stirrup forms influence on the seismic behavior of reinforced concrete short columns,the establishment of related restoring force model was build.Research results show that: in the concrete short column,configuration HRB600 high-strength stirrup can significantly improve the seismic performance,the hysteretic curve more full,but it will reduce component of initial stiffness;with the same case of other design variables,reduction of the stirrup spacing can improve test pieces in elastic plastic stage of deformation capacity,enhance the initial stiffness,improve the ultimate bearing capacity;Configuration of stirrupped experimental pieces on the ultimate bearing capacity,displacement ductility,stiffness degradation and hysteretic curve of the full extent are relatively similar,but allocation rectangle hoop specimens,in all aspects of seismic performance are relatively poor;on the basis of test data processing,the proposes to restore the force model was given,a solution is suggested skeleton curve parameter calculation formula,proposed skeleton curve was put forward and the configuration of HRB600 high strength reinforced concrete short column test skeleton curve has higher degree of agreement with it.can provide reference basis for the analysis of the seismic performance of reinforced concrete short columns.It can provide reference for the seismic performance analysis of short columns.