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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。
Through the low-cycle test of six recycled concrete (RAC) columns with different proportions, combined with the modified Park-Ang two-parameter damage model applied to ordinary concrete columns and the damage Dc of the actual structure, each RAC column The calculated value of the cyclic loading coefficient β. Through the analysis we can get: the replacement rate of recycled aggregate and mixed fiber content have a significant effect on the coefficient β, both of which should be taken as an important factor for the calculation of β. Considering the effect of reinforcement ratio on the coefficient β, the multivariable linear equation based on the replacement ratio of recycled aggregate, mixed fiber content Hf and reinforcement ratio ρa was fitted by Matlab, and the calculation of cyclic loading coefficient β The formula: a fβ = 0.0689ρ + 0.02138 R + 0.05614H, so the modified Park-Ang model is further modified to make it more suitable for the damage calculation of the RAC column.