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A simplified analysis model for determining the seismic response of buried steel pipes at strike-slip fault crossings
Affiliation:1. Department of Earthquake Engineering, Kandilli Observatory and Earthquake Research Institute, Bogazici University, Istanbul, Turkey;2. Department of Earthquake and Structural Engineering, Gebze Technical University, Turkey;3. Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA, US;4. Sharma & Associates, Inc., Countryside, IL, US;5. Department of Engineering,University of Roma Tre, Italy;6. Department of Civil and Environmental Engineering, Renssealer Polytechnic Institute Troy, NY, US;1. Department of Civil Engineering, University of Thessaly, Volos 38334, Greece;2. Department of Mechanical Engineering, University of Thessaly, Volos 38334, Greece;1. Civil Engineering Department, Sharif University of Technology, Tehran, Iran;2. Department of Structural Engineering, Building & Housing Research Center (BHRC), Tehran, Iran;3. Research Bureau, Tehran Province Gas Company, Tehran, Iran;1. College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing, 102249, China;2. China University of Petroleum(Beijing), Karamay Campus, Karamay, 834000, China;1. Institute of Steel Structures, School of Civil Engineering, National Technical University of Athens, 9, Iroon Polytechneiou str., Zografou Campus, GR-15780 Athens, Greece;2. Department of Geotechnical Engineering, School of Civil Engineering, National Technical University of Athens, 9, Iroon Polytechneiou str., Zografou Campus, GR-15780 Athens, Greece
Abstract:The seismic response analysis of buried pipelines at fault crossings is a complex problem requiring nonlinear 3D soil-structure and large deformation analyses. Such analyses are computationally expensive and the results are hard to evaluate. Therefore, a simple numerical model is needed for engineering and design offices to determine the seismic demand of steel pipes at fault crossings. This paper presents a simplified numerical model for buried steel pipes crossing strike-slip faults and oriented perpendicular to the fault. Two pipes with different diameter to thickness (D/t) ratios and steel grades are used in the study. The proposed model permits plastic hinge formations in the pipe due to incrementally applied fault movements, allows determination of the critical length of the pipeline and measure strains developed on the tension and compression sides in the pipe. The model also considers the effect of bending as well as axial strains due to stretching.
Keywords:Buried steel pipes  Continuous pipelines  Damage  Fault crossings  Critical pipe length
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