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提出了一种节点区柱钢管非连续的钢管混凝土柱-钢筋混凝土梁节点形式,通过5个试件的低周反复荷载试验,研究其受力性能。试验结果表明,随着相对配筋系数(节点体积配筋率与梁配筋率的比值)和节点截面面积增大系数(节点区横截面面积与柱截面面积的比值)的减小,破坏区域由框架梁根部向节点区转移,出现了3种不同的破坏形态。梁端受弯破坏的试件,其滞回曲线较为饱满,捏缩现象较轻,试件破坏时节点剪切变形较小;节点区剪切破坏的试件,其滞回曲线捏缩现象较为严重,节点剪应力在达到峰值之后迅速下降,延性较差;兼梁端受弯及节点区破坏形态的试件,其受力性能介于上述两者之间。研究表明,通过合理设计,该钢管混凝土柱-钢筋混凝土梁节点在低周反复荷载作用下的受力性能良好,可应用于工程实践。
A non-continuous CFST column-to-RC beam joint was proposed. The low-cycle repeated loading tests of five specimens were carried out to study the mechanical properties of CFST columns. The experimental results show that with the decrease of the coefficient of relative reinforcement (the ratio of the ratio of the volume of the steel bars to the ratio of the steel bars) and the coefficient of increase of the area of the section (the ratio of the cross-sectional area to the cross-sectional area of the column) From the root of the frame to the node area transfer, there have been three different forms of failure. The specimen with bending failure at the beam end has a larger hysteresis curve and a smaller pinch-in phenomenon, and has less shear deformation when the specimen is damaged. In the nodular region with shear failure, the hysteretic curve is more contracted Serious, the node shear stress decreased sharply after reaching the peak value, and the ductility was poor. For the specimen with bending and node damage, the stress performance was in between the above two. The results show that under proper cyclic loading, the joints of CFST-RC beams have good mechanical properties and can be applied to engineering practice.