Load And Damage Identification Of Tower-side Support Structure Of A Suspension Bridge

The structural health monitoring system was widely used in monitoring structure of large bridge, and it made powerful technical means for getting dynamic response of construction and operation status of bridge structures. Structural health monitoring based on monitoring dynamic response data is the frontier of the theoretical and application study of bridge engineering field, which efficiently evaluate working state and predicated fatigue life is the focus of study, and it has important academic significance and wide application prospect. Structural load and structural damage identification is the base of structural state and life evaluation.Qingdao bay bridge is the first oversized modern bridge on freezing and high salinity waters in the north of China. The bridge designed and implemented a advanced Structural Health Monitoring System with Bridge Inspection and Management System, real-time monitoring the information of ambient excitation and structural response status, in order to evaluate working performance and health status of the bridge. This paperAt the background of Daguhe Waterway Bridge of Qingdao Bay Bridge, based on practical monitoring strain data, combined with finite element digital analysis technology, this paper identify the load of different construction stage of the tower side support structure first, and then, make the numerical simulation of damage identification for tower side support structure which based on strain monitoring. Main contents and research achievements are as follows:(1) According to tower side support structure of a self-anchored suspension bridge with single-tower, the Daguhe Waterway Bridge, create the finite element model, and based on practical monitoring strain data, updating the model through optimization algorithm;(2) Considering temperature effect, based on practical monitoring strain, this paper identify the load(reaction) of tower side support structure, and get the variation curve of tower side support structure load(reaction) of each construction stage of bridge main beam; (3) Through neural net work method, this paper makes the study of numerical simulation, which based on practical monitoring data of structure damage identification.The result showed that:(1) Updating finite element model based on practical monitoring data with high accuracy, which meet the requirements of research of health monitoring;(2) The load identification results better reflect the actual conditions of each construction stage, and provides a basis for the operations and analysis of health status of the whole structures;(3) The damage identification based on practical monitoring strain data is feasible with low noise, and at the same time, study the damage identification method with high noise immunity is needed.