方钢管约束钢筋高强混凝土短柱抗震性能试验研究

Seismic behavior of rectangular steel tube confined high strength reinforced concrete short columns

进行了3个方钢管约束钢筋高强混凝土(STRC)短柱及1个高强混凝土(SRC)短柱的对比试件试验研究。所有试件的剪跨比均为1.5。试验中的主要参数为轴压比。试验结果表明,由于钢管对核心混凝土的有效约束,核心高强混凝土柱的承载力、延性和耗能能力均显著提高。随着轴压比的提高,STRC短柱的抗剪承载力明显提高,延性有所下降。根据试验结果,建议了方钢管约束钢筋混凝土短柱抗剪承载力计算方法。

Three rectangular steel tube confined HRC(High Strength Reinforced Concrete) stub columns,and a contrastive hoope-refined HRC stub column were designed and tested.All of the 4 specimens had the same shear span ratio of 1.5.In the test,the infection of axial compression ratio was focused on.The tests indicate that the core HRC stub columns have superior on deformation capability and aseismic performance due to the restraint by steel tube.The shear bearing capacity of STRC stub column is increased and ductility performance is decreased while axial compression ratio increases.Besed on the results of the test,the shear resistant calculate formula special for steel tube refined HRC stub columns was suggested.