预应力钢绞线加固RC柱的抗震延性研究

o study the seismic ductility of circular reinforced concrete (RC) columns strengthened with prestressed steel wire, twelve circular RC columns including three contrast columns and nine columns strengthened with prestressed high strength steel wire were analyzed with main parameters being the prestressed degree and axial compression ratio under cyclic loading and constant axial load. Concrete constitutive model was improved by considering the influence of prestressed degree reduction factor of steel wire constraints and steel was simulated using nonlinear servo reinforcement, which made the simulation results agree well with the test results. The results show that the seismic ductility of RC columns was obviously improved by using steel wire to strengthen and the axial compression ratio limit of RC columns can appropriately increased. When prestressed degree is greater than 0.6, the seismic ductility of RC columns has no apparent change with the increase of prestressed degree. By considering the axial compression ratio, prestressed degree, shear span ratio and overall stirrup characteristic value influence on seismic ductility, the proposed formula of ductility can be used for reference in the engineering design.