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Bridge dampers are crucial components in bridge engineering for several reasons:

1. Vibration Reduction: They help reduce the vibrations caused by various factors such as wind, traffic loads, and seismic events. This is important because excessive vibrations can lead to structural fatigue and damage over time.

2. Improved Comfort and Safety:By reducing vibrations, bridge dampers improve the comfort and safety of vehicles and pedestrians using the bridge. Reduced vibrations can also enhance the lifespan of bridge components.

3. Seismic Resilience: In areas prone to earthquakes, bridge dampers play a significant role in enhancing the seismic resilience of bridges. They can absorb and dissipate energy during seismic events, helping to prevent catastrophic failure.

4. Cost Savings: While installing bridge dampers adds to the initial construction cost, they can lead to long-term cost savings by extending the lifespan of the bridge and reducing maintenance and repair expenses caused by excessive vibrations.

Overall, bridge dampers are essential for ensuring the structural integrity, safety, and longevity of bridges, especially in areas with high traffic or seismic activity.

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Structural behavior of cantilever beams

🤜Famous photograph by Benjamin Baker, in which through a living model the cantilever structural principle on which the solution to the Firth Bridge over the Forth🤛 was based was depicted.

👉"To illustrate the structural theory of a cantilever beam (Ge**er), a human demonstration was carried out. The loads were represented by the person sitting in the middle of the span of the suspended span. The arms of the persons seated on both sides represented the traction at the joints; the wooden bars, the compression at the lower elements, and the bricks, the anchor points located at the pylons. The chairs represent the granite piles. Imagine the chairs 500 m apart and the men's heads as high as St. Paul's cross (London church, 104 m) their arms represented by steel beams and the canes by 3.5 m diameter tubes at the base you get a good notion of the structure."

👉Heinrich Ge**er applied in 1866 a theory that consisted in subdividing the continuous beam through ball-and-socket joints "which define a point of zero bending moment". This type of beam with intermediate joints is what is now known as a Ge**er beam. The position where these hinges are located allows influencing the behavior of the beam; therefore, it is not only used directly in some structures, but in some projects a real beam can be idealized by assimilating it to a Ge**er beam, whose isostatism allows a simple approximate calculation.

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