PVA纤维增强混凝土框架柱抗震性能数值分析

NUMERICAL SIMULATION INVESTIGATION ON SEISMIC BEHAVIOR OF FIBER-REINFORCED CONCRETE FRAME COLUMNS BASED ON MODEL VALIDATION

为了研究低周往复荷载作用下PVA纤维增强混凝土框架柱的抗震性能,基于有限元模拟软件Open Sees,采用纤维模型对PVA纤维增强混凝土柱和普通钢筋混凝土柱在低周往复荷载作用下的受力性能进行数值模拟,从柱滞回曲线、骨架曲线、承载力、延性性能及耗能能力方面对数值模拟结果与试验结果进行对比分析,校准采用的PVA纤维增强混凝土本构模型参数。在此基础上,重点分析了PVA纤维增强混凝土柱剪跨比、轴压比等参数对其抗震性能的影响。参数分析结果表明:随着柱剪跨比的增加,位移延性系数先增后减,在剪跨比为3时达到最大,极限位移角随剪跨比的增加而增加;随着柱轴压比的增加,位移延性系数和极限位移角均减小。

In order to investigate the seismic performance of fiber reinforced concrete frame columns under low cyclic reciprocating loads,the numerical simulation of mechanical behavior of PVA fiber reinforced concrete columns under low cyclic loading was carried out based on Open Sees finite element software. And the numerical results including the column hysteresis curves,backbone curves,load-bearing capacity,ductility performance and energy dissipation capacity of columns were compared with the experimental results to validate the numerical model. The constitutive model parameters of PVA fiber reinforced concrete are calibrated. Then based on the validated models,the influence of shear span ratio and axial compression ratio on the seismic behavior of fiber reinforced concrete columns was analyzed. Simulation results indicates that with the increase of column shear span ratio,the displacement ductility factor increases first and then decreases. It reaches the maximum value when the shear span ratio is 3. The ultimate interstory drift ratio increases with the increase of the shear span ratio. The displacement ductility factor and the ultimate interstory drift ratio decrease with the increase of the axial compression ratio of the column.