基于变形和累积耗能的型钢再生混凝土柱地震损伤模型研究

Study of Seismic Damage Model of Steel Reinforced Recycled Concrete Column Based on Deformation and Accumulated Energy Dissipation

为研究型钢再生混凝土柱地震损伤性能,本文依据17个试件低周反复荷载试验研究结果,将型钢再生混凝土柱划分为正常使用、暂时使用、修复后使用、生命安全和防止倒塌五个状态水平;以层间位移角作为该柱抗震性能控制指标,对试验数据进行数理统计分析,确定型钢再生混凝土柱不同性能水平下量化指标取值;结合型钢再生混凝土柱受力特征,对修正的ParkAng损伤模型进行改进,确定构件单调荷载下极限变形计算方法;采用多变量回归方法得到耗能因子的计算式,并分析设计参数对型钢再生混凝土柱耗能能力的影响规律,最终建立型钢再生混凝土柱基于变形和累积耗能的地震损伤模型,结果表明:型钢再生混凝土柱在破坏状态时的损伤指标计算平均值为0.986,接近1.0,离散性较小;故该损伤模型用于评价型钢再生混凝土柱的地震损伤性能是可行的;在此基础上,建立了型钢再生混凝土柱不同状态水平与损伤指数的对应关系,并确定了相应的损伤指数取值。上述结论可为型钢再生混凝土柱的抗震性能设计和地震损伤评估提供参考。

In order to study the seismic damage performance of steel reinforced recycled concrete （SRRC） column, according to experimental results of 17 specimens subjected to low cyclic loading, five state levels were proposed to evaluate the performance levels of SRRC columns, including regular service state, temporary use state, repair after use, life safety and prevent collapse. Taking the layer displacement angle as column seismic performance control index, the experimental data were analyzed by mathematical statistics, and the quantitative indexes of SRRC column under different performance leveIs were determined. Based on the mechanical characteristics of SRRC column, the modified Park- Ang damage model is improved again, and the calculation method of ultimate deformation is determined under the monotonic loading. Using multivariate regression method, the calculated energy dissipation factor was obtained~ the influence of design parameters on the energy dissipation capacity of SRRC column was analyzed. Finally, the seismic damage model of SRRC column was establishment based on the deformation and accumulated energy dissipation. Results show that the calculated average value of SRRC column damage index in damage state is 0. 986, approaching to 1, which means small discrete. So it is feasible to evaluate seismic damage of SRRC column by using this damage model. Based on above results, the corresponding relation between different state levels of SRRC column and damage index was established and corresponding quantitative indexes were determined. Above results may provide reference for seismic performance design and seismic damage evaluation of SRRC column.