Structural Safety Assessment of a Suspension Bridge using Analysis Model Updating

摘要

A reduction in concrete compressive strength is detected in the main tower of a suspensionrnbridge. Since this strength is below the design strength, structural safety assessment is required.rnAmbient vibration tests (AVTs) were performed to identify current dynamic of the bridge with 56rndense installation point of accelerometers. Manual tuning method is applied to update analysisrnmodel based on measured dynamic properties. As a result, errors between the analysis andrnmeasurement of the natural frequencies are reduced from 9% to 4%. Automated model updatingrnmethod with sensitivity-based optimization is additionally applied to update analysis model.rnFinally, update model has errors of natural frequencies below 2%. Utilizing the updated model,rnstructural safety assessment is performed considering live load, wind load and seismic load.