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Advances in Civil Engineering
/
2018
/
Article
/
Fig 4
/
Research Article
An Inverted Pendulum Model Describing the Lateral Pedestrian-Footbridge Interaction
Figure 4
The critical curves defined by Equation (
17
): (a)
;
(b)
(c)
;
(d)
.
(a)
(b)
(c)
(d)