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针对采用聚乙烯醇纤维水泥砂浆(PVA-ECC)钢筋网加固的RC柱的一次受力偏压性能进行了研究。通过对8根大、小偏心受压柱在单调荷载作用下的对比试验,研究分析了这种加固方法对偏压柱的极限承载力、破坏形态、荷载-挠度曲线及裂缝分布等的影响机理和规律。试验结果表明,PVA-ECC钢筋网薄层加固是一种有效的加固方法,能够较显著地提高偏压RC柱的承载力、峰值应变、延性、刚度及抗裂性能。最后,在考虑截面有效约束区和非有效约束区及界面传递剪力的基础上,建立了PVA-ECC加固钢筋混凝土偏压柱的承载力计算公式。
A study was conducted on the primary bias performance of RC columns reinforced with PVA-ECC steel mesh. By comparing the test results of eight large and small eccentric columns under monotonic loading, the influence mechanism of the reinforcement method on the ultimate bearing capacity, failure mode, load-deflection curve and crack distribution of the biased column is studied And the law. The test results show that the thin layer reinforcement of PVA-ECC steel mesh is an effective reinforcement method, which can significantly improve the bearing capacity, peak strain, ductility, stiffness and crack resistance of RC columns. Finally, based on the consideration of effective restraint area and non-effective confinement area and interface transfer shear force, the formula of bearing capacity of reinforced concrete columns with PVA-ECC was established.