Chapter 5: Bridge dynamics

Most bridge engineers rarely undertake any form of dynamic analysis, but instead rely on codified pseudostatic load factors and semi-empirical rules to ensure satisfactory dynamic structural response. As bridge engineers and architects employ ever more innovative structural forms and use of materials there is an increasing need to understand and control dynamic response. Irrespective of this trend, it is useful for every practising bridge engineer to understand the fundamental concepts behind dynamics and to be aware of the analysis methodologies that are available. This chapter is a practical guide containing sufficient theory to provide grounding in the subject, supplemented with plenty of practical insights and recommendations for the practising engineer. There is a wealth of good literature on the subject; it is not the intent of the chapter to repeat this material but to put it into a readily digestible context that will appeal to the reader. Extensive references to more detailed texts are provided.