后张预应力钢筋混凝土桥梁结构健康监测基准的发展

建立长期结构健康监测基准和评估体系十分必要。通常,现场试验数据和有限元模型是建立基准的两个关键手段。首次引进伸缩支承的概念,建立包括温度变化的弯曲后张预应力钢筋混凝土桥梁基准现场数据库。数据库来源于未破坏试件的全年监测数据。通过有限元模型建立监测基准。对有限元模型修正的方法,包括材料性能的标定、弹性支承单元的使用、箱梁Mindlin板单元被最新的裂缝Mindlin板单元的置换以及桥的使用状态进行细化。通过有限元模型得到的基准结果与现场测试的基准结果非常吻合。所提出的结构健康监测基准能够进行实时破坏监测,建立监测技术以及进行状态评估。

Development of a Baseline for Structural Health Monitoring for a Curved Post-Tensioned Concrete Box-Girder Bridge

The establishment of a baseline is essential for long-term structural health monitoring and performance evaluation.Usually,field testing data and finite element(FE) model are two critical tools used to develop the baseline.In this paper,the establishment of the baseline field database for a curved post-tensioned concrete bridge with expansion bearings is first introduced to include the effect of varying temperature conditions on the field testing data.This database uses data collected from a full year and i...