Study of dynamic response of a suspension bridge in relation to recorded traffic-induced acceleration

Abstract

This master's thesis is the final work of my master’s degree in structural and material science at the University of Stavanger and marks the ending of 5 consecutive years studying engineering. This thesis aims to investigate the Lysefjord bridge's dynamic response by implementing real-life recorded traffic-induced acceleration of the bridge girder to a finite element model of the bridge. The traffic-induced acceleration data has been provided by the supervisors, and drawings of the bridge used for modeling are sourced from the Norwegian Public Road Administration, with whom this thesis has been developed in collaboration. The primary focus of this thesis revolves around developing a finite element model in Abaqus suitable for reviewing the dynamic response of the bridge. Additionally, considerable effort has been dedicated to processing the recorded data in a manner that best aligns with the Abaqus model. A study of the eigenfrequencies and eigenmodes has been conducted, followed by an in-depth exploration of damping properties associated with various structural components. The dynamic response of the bridge is examined through discussions of time-based plots, encompassing displacements, torsional response and cable forces. This research seeks to contribute a deep understanding of the dynamic response of the bridge under traffic-induced accelerations. Furthermore, this thesis lays the foundation for further investigation, utilizing the developed finite element model for additional extensions or comparative studies. I want to express my sincere appreciation to my supervisors, Jasna Bogunovic Jakobsen and Jónas Þór Snæbjörnsson, for their valuable guidance and support throughout the thesis. I would also like to thank Ove Kjetil Mikkelsen for his guidance involving Abaqus’s arrangement of the finite element method.