含钢率对圆钢管橡胶混凝土短柱轴压性能的影响

The influence of steel ratio on axial compression performance of rubber concrete filled steel tubular short column

钢管橡胶混凝土结构是在钢管混凝土中掺入一定量的橡胶颗粒,既利用橡胶优良的粘弹性增加构件的耗能能力,又保持了钢管混凝土延性好和承载力高的特点。本文以含钢率为变化参数,设计了12根钢管橡胶混凝土短柱试件并进行了轴心受压试验;依据统一理论,提出了钢管橡胶混凝土的轴压承载力计算公式。试验结果表明:钢管橡胶混凝土柱的破坏以钢材屈曲形成环状腰鼓为主;试件具有较好的延性和后期承载力;随构件含钢率增加,钢管橡胶混凝土的轴压承载力明显提高。

Rubber concrete filled steel tube（RCFT）is a new structure. That is mixed rubber particles in the concrete filled steel tube （CFT） . The energy dissipation capacity of RCFT increases because of viscoelasticity of rubber, and RCFT has the good ductility and the high bearing capacity. The parameter was steel ratio, 12 rubber concrete filled steel tubular short columns were designed, and axial compression test was carried out. According to the unified theory, the calculation formula of axial bearing capacity of RCFT was established. The test result showed that the failure mode was ring buckles appeared around column. The RCFT showed high deformation capacity and late bearing capacity during the whole loading process. The axial compressive bearing capacity of RCFT obviously increases as steel ratio increases.