高强型钢混凝土柱抗震性能影响因素研究

Analysis on Influencing Factors of Seismic Performance for High-Strength Steel Reinforced Concrete Columns

通过对已完成试验的7根型钢混凝土柱在低周反复荷载下的受力性能模拟分析,验证OpenSees非线性有限元软件能够对高强钢混凝土柱截面的抗震性能进行分析。采用OpenSees软件建立了考虑型钢和箍筋对混凝土约束作用的有限元分析模型,以剪跨比、轴压比、配箍率和含钢率为参数,对21个高强型钢混凝土压弯滞回试件进行抗震性能影响因素参数分析。结果表明,大剪跨比、低轴压比、高配箍率及高含钢率的高强钢SRC柱试件滞回环更趋于较为饱满的梭形,试件极限变形能力更强:随着剪跨比的提高,试件极限承载力显著下降,延性性能先大幅提高再逐渐降低;随着轴压比的增大,试件极限承载力小幅下降,而延性性能下降显著;随着配箍率和含钢率的提高,试件的极限承载力和延性性能均有所提高,且变化幅度均较小。

Based on the test results of seven high-strength steel reinforced concrete columns（referred to as HSSRC columns）under cycle loading,the OpenSees software is adopted to analyze influencing factors of the seismic performance for HSSRC columns,and verify the numerical model.Considering the concrete confinement exerted by steel,parameter analysis based on 21 finite element（FE）models is conducted to find the impact of shear span ratio,axial load ratio,stirrup ratio and steel ratio on the seismic behavior of HSSRC columns.It shows that the hysteretic loops of columns with bigger shear span ratio,lower axial load ratio,higher stirrup ratio and higher steel ratio tend to be full,and the deformation capacities of them tend to be increased.With the increase of shear span ratio,the bearing capacity drops significantly,and the ductility increases significantly then decreases gradually.With the increase of axial load ratio,the bearing capacity decreases slightly and the ductility decreases significantly.With the increase of stirrup ratio and steel ratio,both the bearing capacity and the deformation capacity improve slightly.