修正的钢筋混凝土结构Park-Ang损伤模型

Modified Park-Ang Damage Model for Reinforced Concrete Structures

摘要:

针对钢筋混凝土结构Park-Ang损伤模型在上下界不收敛的问题提出了修正形式，然后利用美国太平洋地震工程研究中心的钢筋混凝土柱试验数据库和作者完成的试验，研究了修正后损伤模型组合系数的取值，并根据试件的轴压比、剪跨比和箍筋横向约束指标等进行非线性回归分析，得到该系数的经验表达式.对比研究表明相对于Park-Ang模型而言，采用修正后的模型计算的试验破坏点的损伤指标均值更接近于1，离散性较小，能更好地反映钢筋混凝土结构的损伤水平.最后对建筑结构中常见的钢筋混凝土构件给出了组合系数的建议值

Abstract:

The modified form of the Park-Ang damage model for reinforced concrete (RC) structures is put forward with a consideration of the non-convergence of the original model on the upper and lower limit.Then the combination coefficient is calculated on the basis of the cyclic test results of RC columns from the database of the Pacific Earthquake Engineering Research Center (PEER) and the authors’ tests.An empirical formula is derived through nonlinear regression analysis to relate the coefficient with the axial load ratio,shear-span ratio and confinement index provided by the transverse steel.The comparison between the two models indicates that compared with the original model,damage indices at failure state of tests calculated by the modified model have mean value closer to 1 and smaller scatter,and the damage level of RC structures can be better reflected by the modified model.At last,the value of combination coefficient is recommended for ordinary RC members in building structures.