Kratzig及Park-Ang损伤指数模型比较研究

Comparative study of Kratzig and Park-Ang damage index models

随着基于性能抗震设计理论的发展,地震损伤模型在建立性态目标方面受到重视。为了对基于能量的Kratzig模型作进一步的发展和完善,并与目前常用的Park-Ang模型作比较,首先进行6个不同轴压比的钢筋混凝土框架柱的低周反复加载试验,对试件各循环加载的损伤情况进行详细的描述,在此基础上分别用两种模型计算各构件每一级加载的损伤指标,并与试验现象进行对照。将计算结果与有关文献提出的损伤指数抗震设防目标比较,提出Krizig模型对应的设防目标指数范围;对损伤指数目标、模型合理性进行分析。研究结果表明,Park-Ang过低估计构件的损伤,认为基于能量的Krizig模型更符合构件的塑形变形性能。

With the development of performance-based seismic design theory,the damage index model of seismic behavior receives attention for establishment of quantitative criteria in performance-based seismic design.In order to develop the Kratzig damage model and compare with the Park-Ang model,tests of six reinforced concrete frame columns with different axial compression ratios under low cyclic loading were conducted.The damage indices of each loading level for each of the two models were calculated.The damage conditions of every column on each loading level were described and the damage indices compared.After comparing the damage indices with the fortification desired seismic damage indices from the literature,the range of seismic damage index was put forward based for the Kriatzig model.The comparison indicates that the Park-Ang model gave lower damage values,and the Kratzig model was in accordance with the plastic properties of the frame columns.