A Study on Development for Joint of Concrete Filled Steel Tube Column and P.C Reinforced Concrete Beam ( I ) The Investigation of Propriety for Model of Beam-to-Column Joint with Key Parameters, such as Section Type and Axial Force Ratio

콘크리트 충전강관 기둥과 PC 철근 콘크리트 보 접합부의 개발에 관한 연구( I ) -단면형상 및 축력비를 변수로 한 접합부 모델의 적합성 검토-

This paper investigated structural behaviors of joint of concrete filled steel tube column and P.C reinforced concrete beam through a series of hysteretic behavior experiment. The results are summarised as follows: (1) The joint stiffness of concrete filled square steel tube column and P.C reinforecd beam was higher than that of concrete filled circular steel tube column and P.C reinforecd beam, and it was decreased as the increase of the number of hysteretic cycle. (2) The aspects of the hysteretic behavior in the joint was stable as the increase of the number of hysteretic cycle, and rotation resisting capacity of joint of concrete filled square steel tube column and P.C reinforced concrete beam was higher than those of the concrete filled circular steel tube column and P.C reinforced concrete beam. (3) Some restriction must be put upon the ratio of axial force in this joint model because the load carrying capacity was decreased by flexural and flexural-torsional buckling in case of the ratio of axial force 0.6. (4) The emprical formula to predict the ultimate capacity of joint model to superimpose shearing strength of steel web(H section) and bending strength of reinforced concrete beam was expected.