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钢套常用于钢筋混凝土(RC)柱加固。之前的试验研究评估了钢套柱的延性和抗剪性能。然而,实践中常使用预压轴向荷载对RC柱进行加固。尚未对预应力引起的传统柱和新型套管之间的应力滞后效应进行研究。使用一种简单的新型卸载方法,利用预拱钢板提高预应力RC柱的轴向承载力,试验证明该方法能够有效提高RC柱的轴向承载力。提出相应理论模型来计算钢板加固柱的轴向承载力,将模型的预测结果与试验结果相比较,验证了该模型的准确性。
Steel sleeve commonly used in reinforced concrete (RC) column reinforcement. Previous experimental studies evaluated the ductility and shear properties of steel casing columns. However, RC columns are often reinforced with a preload axial load in practice. The effect of stress hysteresis between traditional columns and new casing due to pre-stress has not been studied. A simple new unloading method is used to improve the axial bearing capacity of prestressed RC columns by using pre-arch steel plate. Experiments show that this method can effectively improve the axial bearing capacity of RC columns. The corresponding theoretical model is put forward to calculate the axial bearing capacity of steel reinforced columns. The prediction results of the model are compared with those of the test results. The accuracy of the model is verified.