Study On Wind-Resistant Stability Of A Pipeline Suspension Bridge

As a kind of mature bridges, suspension bridge has been widely adopted for lots of bridges. The common suspension bridges have the character of long span and small stiffness, the problem of wind-induced vibration is prominent. But compared with other types of bridges, suspension bridge has the big advantage of long span and economic. So there are more and more bridges which cover the oil and gas were designed to be suspension bridges. Compared with the common suspension bridge, the stiffness of a pipeline suspension bridge is much more smaller. In this paper, Ian cang jiang pipeline suspension bridge was taken as an example, studying about the flutter critical wind speed, aerostatic stability and affect factors of the flutter critical wind speed. The main conclusions are as follows:1.Using ANSYS to anaslyse the dynamic characteristic of pipeline suspension bridges. This kind of bridges is very flexible as a matter of its basic frequency is very low. The first ten vibration forms are almost vertical and transverse bending. Its torsional stiffness is much bigger than vertical and transverse stiffness, so we ought to pay much attention to the deformation of vertical and transverse when we design the pipeline suspension bridge.2.Through the segment bridge model wind tunnel test, getting the flutter critical wind speed under different wind attack angles, and analysing the flutter stability of the bridge.3.Using three-dimensional linear method to analyse the aerostatic stability of Ian cang jiang pipeline suspension bridge. Meanwhile,some influences on the aerostatic stability of pipeline suspension bridges have also been taken into consideration.Finally, we got some useful results.4.By building the model of the bridge to analy the influence on the bridge when taking both stricter and pneumatic measures. We can make a conclude that it can not improve the flutter stability if we add the section size only, but we can improve it by setting wind cable and cable force. In the measures of pneumatic, setting the central stable plate can also improve the flutter stability, but it fails when setting the guide plate.