钢筋混凝土梁柱概率损伤模型研究

Study on Probabilistic Damage Models of RC Beams and Columns

针对目前概率损伤模型缺乏统一标定方法以及样本扩容困难的问题,以典型构件损伤模型为研究对象,提出概率损伤模型分布参数的标定方法和基于贝叶斯统计的样本扩容方法,并采用典型钢筋混凝土梁柱构件滞回试验标定各极限状态的损伤指数.以8度设防4个不同层数的RC框架结构为例,分别从单一构件损伤和整体结构构件损失综合比较损伤模型对建筑结构性能评估结果的影响.结果表明,本文提出的样本扩容方法能平衡先验信息和抽样信息,采用本文提出的标定流程可为后续样本扩容提供便利;本文经标定的损伤模型均能识别较大概率的破坏状态,在中小地震作用下,建筑结构地震损失均值基本一致,建议采用便于计算的位移损伤模型进行损失评估,在罕遇地震作用下,偏安全考虑,建议采用Park-Ang损伤模型.

In view of the current calibration problems in a lack of unified calibration method and difficulty to sample expansion, the distribution parameter calibration method for probability damage model and sample expansion method based on Bayesian statistical method were proposed. The typical damage model was considered, and damage indexes of each limit state were calibrated by hysteretic test results of conventional reinforced concrete beam-column components. The impact of the damage model on the performance evaluation was examined from single component damage to overall structural component loss in four RC frame structures with different layers in 8 intensity region. The results show that the sample expansion method proposed can balance the prior information and sampling information, and the calibration process proposed can facilitate the expansion of the following sample. The prominent damage state can be recognized by the calibrated damage models;the displacement damage model is suggested under small and moderate earthquakes as its convenience for computation and the earthquake average losses are basically the same, and the Park-Ang damage model is suggested under rare earthquakes for prudence.