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Visualization of Flow Field Around a Vibrating Pipeline Within an Equilibrium Scour Hole
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Seismic performance analysis of shallow-buried large-scale three-box-section segment-connected pipeline structure
Hui Wang1,2, Zhen Chen1,2, Shujiang Ma3
1School of Civil Engineering and Communications, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China.
Scientific Reports
|February 14, 2023
Summary
This study assesses the seismic performance of large-scale, shallow-buried, segment-connected pipelines using a 3D finite element model. It identifies critical stress regions and vulnerable joints, informing anti-earthquake prevention measures for water transfer projects.
Area of Science:
- Geotechnical Engineering
- Structural Engineering
- Seismology
Background:
- Inter-basin water transfer projects require robust seismic safety assessments for shallow-buried pipelines.
- Large-scale, segment-connected structures face unique challenges under seismic and multiple actions.
Purpose of the Study:
- To evaluate the seismic performance of a large-scale, prestressed concrete inverted-siphon pipeline.
- To develop a method for simulating complex interactions within the pipeline system under seismic loads.
Main Methods:
- A detailed 3D finite element (FE) model was developed for a 58-segment inverted-siphon.
- A novel method was implemented to model interactions: viscoelastic boundaries, fluid-structure, and rubber belt joints.
- Time-history analysis was performed using the Elcentro seismic wave.
Main Results:
- Identified main vibration modes and frequencies of the inverted-siphon.
- Located areas of peak tensile stress on the concrete surface.
- Highlighted risk zones of sealed joints with extreme relative displacement.
Conclusions:
- The study provides critical insights into seismic cracking of concrete and tearing of sealed joints in segment-connected pipelines.
- Findings offer a scientific basis for developing targeted anti-earthquake prevention strategies.
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