R. Manigandan
M.E Student, Department of Civil Engineering and Structural Engineering, College of Engineering Guindy, Anna University, Chennai-600025, Tamil Nadu, India
R. Rishikesan
M.E Student, Department of Civil Engineering and Structural Engineering, College of Engineering Guindy, Anna University, Chennai-600025, Tamil Nadu, India
Download PDFFrequency analysis of existing structures is a realistic and cost effective manner in which to conduct serviceability assessments. This type of analysis uses vibration testing and dynamic analysis to identify any change in a structure's natural frequencies, thereby highlighting any degradation invisible to routine inspection. This report aims to analyse a train bridge in Dublin, Ireland and pedestrian bridge on Blanchard Street, Thunder Bay using vibration data. The railway bridge will be analysed using frequency analysis to identify the different types of trains operating on the bridge whilst taking their respective speeds into account. The pedestrian bridge was exposed to a multitude of excitations while the vibrational response was recorded. A finite element model was created modelling the existing Blanchard Street bridge using the S-Frame program. The frequency results from the vibrational data were then compared to the 3D model. It was determined by using each trains physical characteristics (i.e. weight, number of cars, placements of axles, etc.) and unique frequency plots created from the vibrational data, that one could match a train and its resulting plot accurately. In regards to the pedestrian bridge, it was established that using the 3D model created with S-Frame to compare with the vibrational data allowed for accurate and feasible serviceability assessment of structure.
Keywords: serviceability assessments; pedestrian bridges; Structure Integrity
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