000012578 001__ 12578
000012578 005__ 20160920162630.0
000012578 04107 $$aeng
000012578 046__ $$k2016-09-05
000012578 100__ $$aLai, E.
000012578 24500 $$aUncoupled approaches for walking-induced vertical vibration of a lively footbridge

000012578 24630 $$n6.$$pInsights and Innovations in Structural Engineering, Mechanics and Computation
000012578 260__ $$bTaylor and Francis Group, London, UK
000012578 506__ $$arestricted
000012578 520__ $$2eng$$aThe recent trend towards the design of flexible footbridges, characterized by a low ratio between permanent and variable load, has made them more sensitive to dynamic forces induced by pedestrians. While walking, the pedestrian moves on the flexible structure adapting his gait to the bridge motion and interacting with the footbridge. At contact points, the pedestrian transmits contact forces to the bridge that, in turn, imposes a set of displacements and velocities to the pedestrian’s feet. The pedestrian is here described with an increasing accuracy. Neglecting the interaction with the bridge, the pedestrian is described with a refined force model, that simulates the force pattern transmitted by each foot. The position of the two forces reproduces the sequence of single and double support phases, typical of the human gait. Interaction is accounted for when both systems are described as mechanical systems (having proper mass, stiffness and damping matrices). In this work a newly proposed bipedal pedestrian mass-springdamper model is adopted, sharing with the force model the same type of locomotion. The mechanical system is excited by an equivalent bio-mechanical force and its equation of motion takes into account the interaction with the bridge. The coupled equations of motion of the bridge-pedestrian system are then derived; with a forced uncoupling of the equations, the two systems can be analyzed separately. The case study concerns a lively footbridge, whose dynamic response is computed with the different modeling approaches.

000012578 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000012578 653__ $$a

000012578 7112_ $$aSixth International Conference on Structural Engineering, Mechanics and Computation$$cCape Town, South Africa$$d2016-09-05 / 2016-09-07$$gSEMC2016
000012578 720__ $$aLai, E.$$iMulas, M.G.
000012578 8560_ $$ffischerc@itam.cas.cz
000012578 8564_ $$s1658756$$uhttps://invenio.itam.cas.cz/record/12578/files/026.pdf$$yOriginal version of the author's contribution as presented on CD, 026.pdf.
000012578 962__ $$r12552
000012578 980__ $$aPAPER