Mechanical Characteristics Of The Suspension Bridge With 3D-cable And Analysis Of The 3D-Linetype For Postcs

The wide-span ratio of the bridge decreases with the increasing of the span because the required width of the bridge is limited.Consequently the fact reduces the transverse stiffness of the bridge and also do harm to the dynamic stability.Therefore it becomes the critical issues that improving the sparring ability of the suspension bridge without losing its transverse stiffness and the dynamic stability.3d-cabled suspension bridge shows a tridimensional cable style composing of its main cable and its suspender.That kind of bridge can enhance the horizontal load-beating capacity of the cable system and can also improve the transverse stiffness and the torsional stiffness at the circumstances of keeping the initial vertical force.Superiority of the Suspension Bridge with the 3D-cable is based on the precision postcs configuration.The shape of the main cable directly determine its non-stress cable length,the position of the suspension centre and also the non-stress of the suspender.These parameter are absolutely necessary at the design periods and the construction periods.The coordinate of the 3d-cabled suspension bridge need to be solved out more exactly because of the bridge has a tridimensional cable style.This issues has a background of the 1^st bridge at Qinglongshan Park in Yinkou.It is a 3d-cabled suspension bridge with the earth anchor.Analysis of the main content:1.Build two FEM model of this bridge with ANSYS.One model is a 3d-cabled suspension bridge which could simulate the true bridge precisely and the other model is a parallel-cabled suspension bridge which has the same vertical force as the 3d-cabled suspension bridge.With the uneven vertical load and horizontal load on these two models,we compare the displacement of the reference point of these two models and the vibration mode which represent the transverse stiffness and the torsional stiffness.We got a result that 3d-cabled suspension bridge is better than parallel-cabled suspension on the side of transverse stiffness and the torsional property.2.Introducing a precise method to solve the line shape for the cable of the 3d-cabled suspension bridge.The method is called 3d-catenary method.Gets the differences of the traditional method and this method on solving the line shape of the cable.Also the 3d-cabled suspension bridge does not have a long span nowadays,but in the future the suspension with long span could also take the 3d-cabled style in order to enhance the transverse stiffness,torsional stiffness and the dynamic stability.So the research on the 3d-cabled style shows the remarkable sense.