低周反复荷载下高速铁路桥墩损伤评估

发布时间：2018-04-29 21:09

本文选题：高速铁路 + 简支梁桥　；参考：《中国铁道科学》2014年06期

【摘要】：以京沪高铁沿线简支梁桥桥墩为试验原型,对6个缩尺比为1∶5的桥墩试验模型进行低周反复荷载试验,并采用改进的刚度退化模型、Park-Ang模型和Mander-Cheng模型3种地震损伤模型对桥墩试验模型的损伤过程进行评估,研究不同损伤模型对高速铁路桥墩损伤的评估效果。研究表明:Park-Ang模型不能有效评估剪切破坏型桥墩的损伤状态,Mander-Cheng模型的评估结果离散性较大,而改进的刚度退化模型可以较好地评估高速铁路桥墩的损伤状态。结合桥墩试验模型的低周反复荷载试验结果,将高速铁路桥墩的损伤程度划分为基本无损伤、轻微损伤、中等损伤、严重损伤和完全损坏5个等级,并给出各损伤等级相应的损伤指数范围,各等级损伤指数的临界值分别为0,0.25,0.5和1。
[Abstract]:Taking the piers of simply supported beam bridges along the Beijing-Shanghai high-speed railway as the test prototype, the low cycle cyclic loading tests were carried out on 6 piers with a scale ratio of 1:5. The damage process of pier test model is evaluated by three kinds of seismic damage models, improved stiffness degradation model Park-Ang model and Mander-Cheng model, and the evaluation effect of different damage models on pier damage of high-speed railway is studied. The results show that the damage state of shear failure pier can not be evaluated effectively by using the fraction Park-Ang model. The evaluation results of Mander-Cheng model are more discrete, while the improved stiffness degradation model can better evaluate the damage state of the pier of high-speed railway. Combined with the results of low cycle repeated load test of pier test model, the damage degree of piers in high-speed railway is divided into five grades: basic no damage, slight damage, moderate injury, serious injury and complete damage. The range of damage index of each damage grade is given. The critical value of damage index of each grade is 0 ~ 0.250.5,1.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51108027) 中央高校基本科研业务费专项资金资助项目(2011JBM271)
【分类号】：U443.22

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