柱端箍筋不同加密的钢筋混凝土柱的抗震性能分析

Analysis of Seismic Performance of Reinforced Concrete Columns with Different Encryption of Column End Stirrups

为进一步明确柱端箍筋配置对钢筋混凝土柱的抗震性能影响,以柱端箍筋配置为主要研究参量,浇注4根钢筋混凝土柱试件。对各试件进行反复加载试验,研究各试件的滞回曲线、骨架曲线、承载能力、刚度退化及能量耗散系数等。结果表明,对柱端轴向0~250 mm范围内的箍筋进行加密,有增大试件的最大承载力和控制试件破坏之前的剪切变形量的作用;随着箍筋加密区的增大,试件的延性和耗能性能提升;随着加载循环次数的增大,各试件的承载力和刚度减小。

In order to investigate the influence of different stirrup configurations at column ends on the seismic performance of RC column,the stirrup configurations at column ends was taken as the main research parameters,and four sets of RC column specimens were designed.Reversed cyclic loading tests were conducted on each specimen to study the hysteretic curve,skeleton curve,bearing capacity,stiffness degradation and energy dissipation coefficient.The results show that encrypting the stirrups in the range of 0~250 mm in the axial direction of the column ends can increase the maximum bearing capacity of specimens and control the degree of shear deformation before the failure of specimens.With the decrease of the stirrup spacing in stirrups encryption area at column ends,the ductility and energy dissipation capacity of the specimen increases.With the loading cycles increase,the bearing capacity and stiffness of each specimen decrease.