Study On Mechanical Property Of Curved Cable-Stayed Footbridge With Single Tower

In recent years,in order to adapt to the people-oriented concept of urban life,the concept of slow traffic has been proposed many times at home and abroad.At the beginning of the new century,European countries began to plan the city’s slow traffic,such as Copenhagen’s "urban public space program",London’s "design for pedestrians",etc.China started relatively late,in 2015,Shanghai developed China’s first slo w traffic planning.Walking system is an important part of slow traffic,footbridge as a link between walking systems,has a wide construction prospects.The curved cable-stayed footbridge with single tower is a complex structure,mainly been built in Europe.The structure has the advantages of reasonable technology,less space occupation and beautiful appearance,so it is a quite competitive structure for footbridge.In China,there are few researches on this type of structure,so it is urgent to carry out the study of this kind bridge.In order to use FE software to study the mechanical properties of a spatial and complex crescent-shaped curved cable-stayed footbridge with single tower and double cable plane,two curved cable-stayed bridge with different layout dismantling from the bridge were studied firstly,then study the combination.Studies show that the curved cable-stayed bridge with single tower and unilateral cable has obvious coupled effect of bending and torsion,the cable can resist torque as elastic support,but layout of unilateral arrangement will cause torsion.Axial force in curved cable-stayed bridge with lateral cable contrary to the bridge with inner cable,hence has guiding significance for reasonable material of bridge.The critical position of tangential component of cable force of the beam with inner cable is center point,and the critical positon of radial component of cable force of the beam with lateral cable is tangent point.Setting lateral displacement of the tower as main design,dividing cables by direction of cable force to tower,can calculate the cable force of the cable under complete state quickly and reasonable.The reasonable arrangements of c ross bracing and prestressed tendon can improve the mechanical performance of bridge,reduce the overall weight of the structure and meet the requirement of structure performance at the same time.Further measures are needed to improve the natural frequenc y of bridge to avoid vibration problem.The research has certain engineering application value and good economic benefit.