新型预制管混凝土柱抗震性能试验

Experimental investigation of seismic behavior of new concrete-filled precast tubular column

采用预制管代替钢管混凝土柱中的钢管形成一种新型的预制管混凝土柱。为了研究新型预制管混凝土柱抗震性能,制作了1根预制管混凝土柱和1根对比的钢筋混凝土柱,研究二者在低周往复荷载作用下的破坏过程、滞回曲线、骨架曲线、承载力、变形及延性。结果表明:预制管混凝土柱和钢筋混凝土柱破坏模式都为弯剪破坏;预制管混凝土柱滞回曲线呈现梭形,曲线饱满,具有良好的耗能能力;预制管混凝土柱的承载力、延性系数和弹塑性层间位移角比相应的钢筋混凝土柱都大,等效粘滞阻尼系数钢筋混凝土柱略大于预制管混凝土柱。新型预制混凝土柱具有钢筋混凝土柱的抗震性能,能够满足抗震要求。

In this paper,we propose a new concrete-filled tubular column using a precast-concrete tube instead of a steel tube in the column. To investigate the relative seismic behavior of this column,we manufactured a concrete- filled precast-concrete tubular column and a reinforced-concrete （ RC ） column and subjected both to a damage process of low-cyclic loading. We then determined the hysteretic curve,skeleton curve,bearing capacity, deforma-tion ,and ductility of each column under these conditions. T he results show that both the concrete-filled precast- con-crete tubular column and the RC column experienced flexural failure. The hysteretic curve of the concrete-filled pre-cast-concrete tubular column was plump spindle,which indicates that it has good dissipation energy. In comparison to the RC column,this column also exhibited a larger bearing capacity,ductility coefficient, and elastic plastic dis-placement angle,but the equivalent viscous damping coefficient of the RC column was slightly larger than its counter-part. Thus,we can conclude that the proposed concrete-filled precast-concrete tubular column demonstrates the same good seismic performance as the RC column and can meet seismic requirements.