Application Of Bridge Health Monitoring System In Bridge Maintenance

With the rapid development of China’s economy and infrastructure,the demand for transportation is also increasing with the rapid development of all walks of life.The traffic pressure of highways and bridges has become a thorny problem in the transportation industry,which undoubtedly poses a threat to the normal operation of bridge structures.Therefore,during the operation of bridges,the traffic pressure of highways and bridges has become a thorny problem.The problem of management and maintenance has become the current research focus.Based on the existing equipment technology and evaluation theory of bridge health monitoring system,combined with the support of bridge routine inspection report,this paper puts forward the research idea of applying bridge health monitoring system to bridge management and maintenance,and carries out bridge health monitoring through four aspects: literature research,framework research,theoretical research and engineering case study.The main contents and innovations of this paper are as follows:1.Aiming at the bridge health monitoring system,this paper combs and discusses the design objectives and criteria of the system,monitoring items and contents,optimization and layout of sensor system and other structural mechanisms.The research shows that the health monitoring system can achieve real-time collection of bridge information and provide a basis for bridge structure state assessment.2.Combining with the concept of load test check coefficient and considering the requirement of material strength and structural deformation in relevant codes,the envelope technology of check coefficient and the envelope evaluation technology of allowable value are put forward.Combining with the actual state of the bridge,the structural resistance of the bridge is revised.The research shows that the envelope theory can do the monitoring data acquired.Effective evaluation is made to further grasp the true working state of bridge structure.3.According to the calibration coefficients obtained from envelope theory,the technical status of stress and deflection is scored.Based on the hierarchical method,the comprehensive scoring process of bridge comprehensive technical status is established,which is evaluated by the first-level index and the second-level index.With reference to a large number of literatures,negative exponential function is selected as the sample fitting model,and the bridge is regressed and fitted.The decay trend of the technical status of beams is presented,and the concept of periodic maintenance and its correction model are proposed.4.Selecting the location of the disease,the quantity of the disease project and the revised maintenance coefficient as the maintenance statistics source index,the calculation model of the bridge maintenance input cost in the target maintenance cycle is established,and the average monthly maintenance input cost is taken as the decision-making basis index to provide technical support for the bridge management and maintenance work.5.Based on the Longhe Bridge,the health monitoring data of Longhe Bridge from 2013 to 2017 are analyzed and processed.Combined with the results of the periodic inspection report and the regular inspection report,the comprehensive technical status score of Longhe Bridge for 60 consecutive months is obtained by using the analytic hierarchy process.Based on this data,the periodic maintenance decay model and input index estimation model are established.Finally,the three effective maintenance cycle time,total periodic maintenance cost and monthly average maintenance cost of Longhe Bridge are obtained,which provides theoretical support and decision-making reference for bridge maintenance.