摘要
从竖向刚度和平顺性二方面入手,考虑徐变、钢筋锈蚀等不同因素对时变刚度的影响,建立桥梁静活载产生的弹性挠度变形模型和恒载产生的长期挠度变形模型.将弹性挠度值和长期挠度值分别作为对竖向刚度和平顺性评估的指标,应用贝叶斯推衍模型,以先验模型为基础,融合t0时刻的工程检测数据,对t0时刻上述指标进行更新推衍并与允许值对比;以更新后的先验模型为基础,通过分析其变化趋势及与允许值间的关系,实现对重载铁路桥梁服役性能随运营时间演变的评估和预测.通过在工程实测中的应用表明评估结果与实际情况符合较好.
To study the vertical stiffness and ride performance assessment method,the model of elastic deflection under static live load and long-term deflection under dead load were established,considering the impact of different factors on time-dependent stiffness.Regarding elastic deflection value and long-term deflection value respectively as the assessment indicators of vertical stiffness and ride performance,the Bayesian inference model was used to update indexes above for time t0 based on prior model and contrasted with the allowable limits,to determine indexes for any time t0 based on updated prior model.The indexes trend and the relationship with the allowable limits were analyzed to achieve the time-dependent in-service performance assessment and the prediction for heavy haul railway bridges.It is seen that the evaluation results agree with the actual situation.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第12期103-106,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家高技术研究发展计划资助项目(2009AA11Z101)
国家自然科学基金资助项目(51174291)
关键词
重载铁路桥梁
服役性能
时变刚度
平顺性
贝叶斯理论
heavy-load railway bridge
performance in service
time-dependent stiffness
ride performance
Bayesian theory
