钢管约束钢筋混凝土转换短柱抗震性能试验研究

Experimental study on seismic behavior of tubed RC transition short columns

钢管约束钢筋混凝土短柱具有优越的延性和弹塑性层间变形能力,因此在转换柱中应用时可显著提高转换结构的整体抗震性能。对大连中国石油大厦外筒的钢管约束钢筋混凝土转换短柱进行了抗震性能模型试验,模型比例为1∶6。试验中的主要参数为轴压比、剪跨比和对拉钢筋设置。试验结果表明,钢管约束混凝土短柱中,钢管对核心混凝土的有效约束限制了核心混凝土剪切破坏的产生,改变了钢筋混凝土短柱在水平地震作用下的剪切脆性破坏模式。在抗震工程中采用钢管约束钢筋混凝土柱可有效提高钢筋混凝土框架短柱的延性、弹塑性层间变形能力和耗能性能,从而显著提高结构的整体抗震性能。

Tubed RC short columns exhibited excellent ductility and interstory plastic deformation capacity,therefore the anti-seismic performance of transition structures will be improved obviously when the transition short columns are in the form of tubed RC columns.Model test was carried out to study the seismic behavior of tubed RC transition short columns used in the outer tube of Dalian China Petrol Mansion building.The scale of the model was 1∶6.The main parameters studied in this research were axial load ratio,shear span to depth ratio and using of stiffening bars.The test results indicate that the effectively confinement from the outer tube to the core concrete restrains the shear failure of RC short columns and transforms the brittle shear failure mode of RC short columns under lateral seismic load.Using tubed RC columns in anti-seismic structures will effectively improve the ductility,interstory plastic deformation capacity and energy dissipation capacity of RC short columns,thereby effectively improve the anti-seismic performance of the whole structures.