🌉 Cable Footbridge: Sag, Tension, Pedestrian Resonance and Wind Sway (2D)

Side view of a cable-supported footbridge between two towers. Set the span, the sag, the mass, the number of pedestrians, their step frequency, the damping and the wind, and see the cable tension, the vibration frequency of the chosen mode, the amplitude and acceleration when the steps match it, the sideways wind sway and the frequency at which the wind sheds vortices. The cable shape, the cable length, the resonance amplitude and the mode frequency are checked numerically, with four in-page numerical checks.