Lateral Vibration And Vibration Control Analysis Of Foot Bridges

With the continuous development of modern transportation and traffic increasing, The number of foot bridges is increasing. The structure of the foot bridge developed from single simply-supported bridge to the cable-stayed bridge, suspension bridge and arch bridge now. Material from a single timber to today's concrete, steel, and various combinations of materials. Bridge span from a few meters to tens of meters or even hundreds of meters now. These are not only led to a large pedestrian bridge across, light and soft, such as the direction of development, but also makes footbridge better integration with the surrounding environment. But these new structures and material make the footbridge damping is more and more low, it is easy to strangers bridge resonance distributed load incentives in the crowd. Such incidents are very much in recent years, so it is necessary to study the vibration of the foot bridges. At first people just focus on the vertical vibration that vertical vibration resonance is the main reason of footbridge's vibration. The Millennium bridge in London excessive transverse vibration makes people begin to pay close attention to bridge transverse vibration. Subsequent studies have shown that bridge transverse vibration is more serious than the vertical vibration. But countries are blank norm here.Based on a simply supported steel foot bridge. Using finite element modeling software Midas Civil build the model and analysis the model. The research on the rules of the pedestrian bridge transverse vibration. Calculate the number of critical pedestrian bridge resonance. Calculate the number of pedestrian bridges the critical response time history. Through a critical mass of people to avoid the pedestrian bridge resonance is now recognized as one of the most effective ways. In the pedestrian footbridge vibration induced a very important factor is the comfort of pedestrians and comfort index. For the comfort of pedestrians can't meet the need for reinforcement of bridges. Based on the structure of energy dissipation technology to reinforce the footbridge. Using a tuned mass damper(TMD) and multiple tuned mass dampers(MTMD) reinforcement. The parameters of tuned mass damper are calculated and simulated with software. Comparison of the two reinforcement damping effect, and a comprehensive evaluation of the two methods.