Static, Dynamic And Buffeting Analysis Of Suspension Pipeline Bridge

Petroleum and natural gas is the indispensable energy in any country. As an efficient convey, pipelines are the most widely. constructed around the world. Suspension aerial crossing structures, for the optimal structural style and constructional visual effect, are broadly applied for supporting pipelines across some special terrain. The corresponding research work on the static and dynamic properties of suspension pipeline crossing structures, especially their dynamic responses under wind loads, has been conducted by many scholars. Based on a project of the analysis of a suspension pipeline bridge brought forward by China Liaohe Petroleum Engineering Co.,Ltd.(LPE), in this thesis, an finite element model(FEM) is developed, the static, dynamic and buffeting analysis under the wind load are executed via ANSYS. The main research work is depicted as follow.1. A Finite Element Model of the given structure is developed via ANSYS. Through adjusting the initial stresses of cables, switching on large deformation and stress hardening, static analysis under dead loads is conducted. From the results it is shown that the main cables are the central mechanical components, and all stresses inside the suspension bridge are less than yield strength.2. According to the checking calculation of static wind load in the code, the corresponding VB programs are made. The static wind load on the structure is calculated by using the program, and the static analysis of the structure under the combination of dead and wind loads is carried out via ANSYS. The results give the same conclusion as case one.3. The dynamic analysis of the given structure is carried out via ANSYS. From the frequencies and modes, it is concluded that the suspension pipeline bridge is a kind of structure with very low frequencies, intensive modal frequency distribution, and complex vibration characteristics. Its low frequencies mainly focus on horizontal and vertical bending.4. Based on the formulas in the code, programs for checking the static, galloping, and flutter stabilities are made by using VB. Meanwhile, in order to study the effect of different factors on the dynamic properties of the suspension pipeline bridge, several load cases are designed. By comparesion, it is drawn that transmission medium can effectively drop base frequency, and crossover network cable for connecting two main cables can increase the structural rigidity. The bigger angle of the horizontal cable with respect to horizontal plane can effectively improve the frequencies of vertical and lateral bending, but has little effect on torsional stiffness.5. Through harmonic response analysis in ANSYS, the Pseudo-Excitation Method (PEM) is introduced and applied to ANSYS solution. Two examples are presented to check out the solution and demonstrate the feasibility of PEM in ANSYS.6. The correlative formulas of quasi-static buffeting force model are derived. Through MATRIX27 element in ANSYS, simulation about aero-elastic stiffness matrix and aero-elastic damping matrix of self-excited forces is realized, and then the buffeting analysis of suspension pipeline bridge in ANSYS is achieved by PEM.