Seismic Response of Cable-Stayed Spanning Pipeline Considering Medium-Pipeline Fluid–Solid Coupling Dynamic Effect

Abstract

With the aim of determining the influence of the fluid–structure coupling dynamic effect of the oil and gas transmission medium and pipeline on the seismic response, an oil pipeline supported by a cable-stayed spanning structure was taken as the study object. Kinetic equations taking into account the action of oil and gas medium were studied, and a finite element model structure considering the additional-mass method and the fluid–structure coupling effect were established separately. In addition, the mechanism of the oil–gas–pipeline coupling action on the seismic response of pipeline structure was analyzed, and the results were obtained. The results show that the pipeline has a minimal seismic response at the abutment location, the seismic response gradually increases along the abutment to the main tower, and the seismic response reach is maximized at about one-fifth of the bridge platform. The seismic response of the oil and gas pipeline model structure using the additional-mass method is generally more significant than that based on the fluid–solid coupled dynamic model; moreover, the maximum displacement response differs by about 24%, and the maximum acceleration response differs by approximately 30%, indicating that the oil and gas medium has a certain viscoelastic damping effect on the seismic response of the oil pipeline, which provides a reference for the seismic response calculation theory and analysis method of cable-stayed spanning oil pipelines.

Provenance and Tectonic Setting Discrimination and Their Effects on the Pore-Scale Fluid Flow of Black Shale: Take the Micangshan Tectonic Belt, Central China, as an Example

“…This movement led to full collision until the Late Triassic and experienced continuous compression as well as reconstruction in the Yanshan-Himalayan [26]. Finally, the thrust nappe structure, thrust faults, and continuous fold deformation were formed and were widely distributed [4,[26][27][28][29]. Three sets of black shale formations of the LSLF, LCNF, and USDF were formed and strongly reformed by multiple tectonic processes (Figures 1(b)-1(d)).…”

Study on the restraint control of an isolation pile on an existing high-speed railway during the close passing of a shield machine

“…In Figure 2A is the effect of soil stress disturbance directly caused by excavation; B is the stress that has been transferred to the railway bridge pile; C is the lateral frictional resistance of the isolation pile caused by surface settlement; and D is the effect of the isolation pile on the lateral earth pressure. When the soil is deformed due to excavation, the deformation is transferred to the pile location and will cause the pile to move and deform, but the displacement and stress of the isolation pile will also develop synchronously, and resist the influence at the same time Weng et al, 2023, Qiu et al, 2022. Although the soil stress disturbance caused by excavation is continuously transmitted the lateral earth pressure is constrained by the isolation pile, and the two effects cancel each other out, so the stress that is transmitted to the railway bridge pile is greatly reduced.…”

Enhancing transmission type frame structures: A BBO algorithm-based integrated design approach

“…Size optimization, the most established method in truss structures, forms the foundation of engineering structure optimization. On the other hand, size, shape, and topology optimization, also known as layout optimization, represents a more advanced and challenging method involving various optimization design variables that can introduce coupling difficulties, complicating the achievement of precise and viable optimization outcomes [7,8]. The surge in optimization design theory research and the widespread adoption of intelligent optimization algorithms in engineering design have heightened the demand for engineering structure optimization, making truss structure optimization a focal point of research.…”