在役桥梁中混凝土材料的徐变监测与分析

在一个某大桥的长期健康监测系统支持下,以长达1 000多天的大量监测数据为基础,系统地综合分析活载、温度分别等情况,从中遴选出可以同于分析桥梁徐变应变的初始监测数据。通过对遴选的有效监测数据的分析,成功地获得在役混凝土桥梁的混凝土徐变,并且实测值和理论分析的结果比较吻合。进而基于徐变分析,本文推断桥梁跨中挠度的变化趋势,有限元模型的分析很好地证实本文的推测。通过徐变监测分析,不仅直接得到了在役桥梁混凝土徐变随外加荷载的变化规律,有助于从监测应变推断桥梁的变形趋势。

The Monitoring and Analysis on the Concrete Creep Behaviours of a Serviced Bridge

Based on the monitoring data of nearly 1 000 days from a health monitoring system of a serviced bridge,the initial data were clarified for creep analysis from amount of monitoring data by analysis the loading and temperature informations synthetically.By analysis on the clarified monitoring data,the creeping strains of the bridge were obtained successfully,and measured results have a good agreement with the theoretical results.Based on the creep analysis,the deformation of the bridge were deduced and verified by the FEM results.By the analysis of the serviced bridge,we can get not only the variation of the creeps of the concrete of a serviced bridge directly,but also can deduce the deformation tendence of the bridge.