Study On Practical Health Monitoring System And Safety Evaluation Standard Of Long-span Continuous Rigid-frame Bridge

The current worldwide large Bridges are aging, which inevitably leads to bridgesafety accident frequently mainly due to artificially bridge maintenance management.In order to ensure the safe operation of the bridge, it is necessary to install bridgehealth monitoring system to monitor the occurrence and development of crack,deflection, strain and long-term health monitoring at the mid-span section the main ofthe bridge.Long bridge health monitoring which make it easy to understand of the bridgehealth, access the damage of the bridge timely, so active measures can be taken toensure the safety of the bridge health. Relaying on Chongqing science and technologyproject of traffic "chongqing jiangjin changjiang river bridge monitoring practicaltechnology research", and combined with the practical engineering and data analysisto research long-span continuous rigid frame health monitoring technology, this papermainly studies the contents as follows:①After the characteristics and applicability the current domestic and foreignbridge health monitoring method are analyzed and compared, a method applied tomonitor long span continuous rigid frame bridge for the long-term health is presented.Long-span rigid-framed bridge defects are analyzed, which provides evidence formonitoring subsystems method and for the selection of instrument. Based on the fullcomparison and analysis of the existing bridge monitoring method presented, thepractical and economical safety monitoring system applied to typical representativelong-span continuous rigid frame bridge are Put forward. Practical safety monitoringsystem is designed and applied in long-span rigid-framed bridge, after assessing theresults of monitoring.②The main influence factors are identified relying on engineering, and theactual stress state is mastered, which make it easy to identify and analyze sensitivefactor for the similar large span bridge; meanwhile the actual stress state and bridgeworking condition are mastered, which laid the foundation for safety evaluation of themeasured data of the implementation.③Based on real-time monitoring data, security assessment standard research isthe core of the paper,which recognize stress and deformation through the recognition’zero’ point under the influence of live load and temperature, and find relevant methodand the limit to analyze and evaluate safety.On this basis, combining with the measured data, bridge health monitoring warning index is put forward to evaluatesingle live load, temperature, dead load+live load+(temperature).