【摘要】 通过对不同配比的6根再生混凝土(RAC)柱进行低周反复试验,结合适用于普通混凝土柱的修正Park-Ang双参数损伤模型及实际结构各震害破损度Dc,确定了各RAC柱的循环荷载系数β的计算值。通过分析可得:再生骨料取代率及混杂纤维掺量对系数β均有明显的影响,需将二者同时作为计算系数β的重要因素。考虑配筋率对于系数β的影响,利用Matlab对以再生骨料取代率R、混杂纤维掺量Hf、配筋率ρa为基础的多变量线性方程进行拟合,确定了循环荷载系数β的计算公式:a fβ=0.0689ρ+0.02138 R+0.05614H,从而对修正Park-Ang模型作出了进一步修正,使其更适用于RAC柱的损伤计算。更多还原

【Abstract】 Low-cyclic loading tests with recycled aggregate concrete(RAC) columns for six different proportions are carried out.Combining the modified Park-Ang two-parameter damage model suitable for ordinary concrete columns and the damaged degrees Dc for actual earthquake damage structures,cyclic loading coefficient β is calculated for RAC columns.By the analysis of calculated β,it concludes that β is significantly influenced by recycled aggregate replacement ratio and mixed fiber contents.And both of them should be taken into account as significant factors for calculation of β.Considering the effects of reinforcement ratio on β,multivariate linear equation for recycled aggregate replacement ratio R,mixed fiber contents Hf and reinforcement rate a ρ is fitted by using Matlab,for cyclic loading coefficient β,a formula is identified: a f β = 0.0689 ρ+ 0.02138 R +0.05614H.The modified Park-Ang model is further amended,and thus more applicable for damage calculation of RAC columns.更多还原