钢筋混凝土圆形薄壁空心柱的恢复力特性研究

基于4根钢筋混凝土圆形薄壁空心柱低周往复加载试验数据,以峰值荷载点为基准,将试件的骨架曲线分四段拟合,确定了试件开裂点、屈服点、极限点与峰值点的关系。按照现行混凝土结构设计规范并结合试验结果的回归分析,得出了峰值荷载及所对应位移、极限位移的计算公式;结合试件的滞回规律构建了钢筋混凝土圆形薄壁空心柱的恢复力模型。研究结果表明:拟合的骨架曲线特征点的计算方法具有较高的精度;构建的恢复力模型与钢筋混凝土圆形薄壁空心柱的试验滞回曲线吻合较好。

Research on Restoring Force Characteristics of RC Circle Thin-walled Hollow Column

Based on the test results of four specimens under low-cycle reciprocating load,which were RC circle thinw alled hollow columns,and with the peak load point as reference,their skeleton curves were fitted as four lines so that the relations between the crack point,the yield point,ultimate displacement point and peak load point were determined.In accordance with the existing concrete structure design specif ication and combined with regression analysis of test results,the calculation formulas of peak load and the corresponding displacement,ultimate displacement were derived.In combination with the hysteretic properties of the specimens,the restoring force model of such type columns was obtained,and the calculation values and test values were compared. The results indicate that the calculation method of the characteristic points of fitted skeleton curves has high precision,and the constructed restoring force model of RC circle thin-w alled hollow column matches well with the hysteric curve from the test.