Humans and Slender Structures: Dynamic Loading and Interaction
Speaker: Stana Zivanovic, University of Warwick, UK
Series: CEE Departmental Seminars
Location: Bowen Hall Auditorium
Date/Time: Friday, February 15, 2013, 4:30 p.m. - 6:00 p.m.
Increasing slenderness of modern structures makes them sensitive to dynamic loading induced by humans. It is now frequent that the vibration serviceability state of footbridges, grandstands, staircases and long-span building floors govern their design. People walking, jumping, running and bouncing are not only capable of generating strong structural vibrations, but also being intelligent highly adaptable dynamic systems they can interact with vibrations perceived. As a result of this interaction, the vibration response of the joint-human structure system might be difficult to predict and evaluate. Ever since June 2000, when the excessive sway of the Millennium Bridge in London occurred under dense crowd of pedestrians, the modelling of human interaction with structures has been subject of intensive research, especially in the UK and the rest of Europe. The talk will address key elements of modelling dynamic loading induced by humans, mainly in the context of footbridge structures. Main features of kinematics related to walking and jumping activities will be presented. The walking-induced dynamic loading is important since it is the most frequent type of loading on footbridges, while jumping represents a rare but extreme form of loading typical of vandal actions. Experimental research work at Warwick on identifying these forms of loading will be explained, and the current challenges in modelling human interaction with vibrating footbridges will be discussed.