The Research Of Critical Technology For Huge Bridge Maintenance Based On Long-term Monitoring

At present, in order to understand the structure of the whole health and various internalfactors of the bridge damage degree and bridge own aging of the consequences in themaintenance management process more fully，large bridge long-term health monitoringsystem is used more widely, even to the point of flood, so that a lot of monitoring dataprocessing is not seasonable, even more, the processing method of mistakes, not accurate forthe bridge maintenance provide effective "help". Evaluation method mainly through twocategories：The static and dynamic, large bridge health monitoring in service of long-termbridge for the safety evaluation. If large bridge safety assessment can do it as the bridgegrading evaluation, then more conducive to guiding maintenance work, work out the effectivemaintenance technology. But the small bridge classification of evaluation’s vast majority ofwork is done dependent on the bridge inspection or bearing capacity, durability and functionalunder the premise of the artificial detection, it violated the based on long-term healthmonitoring data sources, so, the data of the large bridge health monitoring state gradingevaluation method is urgently needed. This paper aims at the bridge structure from the natureof the deflection and material modulus, based on the real-time monitoring information tolong-term basis, through the main extraction live load effect and the deteriorating effect,achieve the bridge in service in the health status of grading evaluation research.First of all, understanding of time multi-scale features based on the long-term healthmonitoring data, Separated data into the live load effect caused by bridge load anddeteriorating effect caused by the concrete structure shrinkage and creep factors,etc, usingmeans of wavelet filter spectral analysis and so on；Secondly, in view of the existing concretematerials, in the fatigue loading damage test, this paper analyzed the law of development ofmaterial deflection change and material strain change, through the least square method toimprove the hyperbolic fitting and logarithm fitting,established the mathematical model of thedeflection change. Through the deformation of the logistic regression model, simulated theprocess of material modulus attenuation, and take it and live load effect, degradation effectsinto the fixed flamel’s classic damage of formula, which is one of five typical fatigue damage,established the mathematical model of the material decay. Again, finding out two mathematicalmodel and some of the index link up with evaluation standard of the highway bridge, dividedinto the bridge from macro start deformation degree evaluation and from the microcosmic viewof decay of degree evaluation, combining the two evaluation method according to the mostunfavorable principles established large bridge health state comprehensive evaluationclassification, and according to different grade made corresponding maintenance measure. Finally, through the application of bridge based on the data of real-time monitoring,demonstrate the effectiveness of the integrated evaluation method to long-term monitoring ofhealth status assessment of the bridges in service based on the deformation and decay of thebridge.