Structural Response and Failure Analysis of a Suspension Pipeline Bridge Subjected to Typical Loads

In order to study the structural response and failure of suspension pipeline bridges under typical loads, the Yellow River suspension pipeline bridge is taken as the study object, the stiffness matrix under the coupling effect of geometric nonlinear factors is derived, the numerical simulation model and the health monitoring system are established, and the shape-finding calculation of the cable structure system is carried out. The numerical simulation model is validated by comparing simulation data with monitoring data. Through modal analysis, it is found that the Yellow River suspension pipeline bridge is a low-frequency vibration structure. On the basis of the above work, its structural responses under typical loads are quantified. The stress and displacement distribution laws of the cable structure system under snow loads are obtained. With the increase of snow load, the stress of the main cable, suspension cable, tower, and bridge truss increases, while the stress of the tie cable, wind cable, and stable cable decreases. At low wind speeds, the wind cable is more sensitive to wind loads, while at high wind speeds, the bridge truss is more sensitive to wind loads. Under the pigging load, the maximum displacement change occurs at 5/8 of the bridge truss, and this discovery helps to accurately protect the weak location under the water hammer action. When the pig passes through a certain point, the displacement at that point will show a downward turning point. Under the seismic load, the amplitude of the bridge truss, main cable, and wind cable is relatively large. And the positive displacement is much greater than the negative displacement. The displacement at 1/2 of the wind cable is less than the displacement at 1/4 of it, which indicates that the flexibility of the wind cable is maximum at its 1/4 position. Finally, the weak links and corresponding failure prevention measures of the Yellow River suspension pipeline bridge are determined, which can provide the reference for the daily maintenance, integrity management, reliability analysis, and optimization design of other suspension pipeline bridges.