scholarly journals Large deformation behavior of buried pipelines with low-angle elbows subjected to permanent ground deformation.

2001 ◽  
pp. 41-52 ◽  
Author(s):  
Koji YOSHIZAKI ◽  
Thomas D. O'ROURKE ◽  
Masanori HAMADA
Keyword(s):  
Large Deformation ◽  
Deformation Behavior ◽  
Ground Deformation ◽  
Buried Pipelines ◽  
Permanent Ground Deformation

Site Effects on Seismic Behavior of Pipelines: A Review

2000 ◽  
Vol 122 (4) ◽  
pp. 469-475 ◽  
Author(s):  
Jianwen Liang ◽  
Shaoping Sun
Keyword(s):  
Site Effects ◽  
Seismic Behavior ◽  
Ground Deformation ◽  
Lateral Spread ◽  
Site Condition ◽  
Buried Pipelines ◽  
Fault Movement ◽  
Local Site ◽  
Permanent Ground Deformation ◽  
Almost All

Post-earthquake investigations showed that local site condition had significant effect on seismic behavior of pipelines: almost all seismic damages to buried pipelines were either due to permanent ground deformation such as fault movement, landslide and lateral spread, or found in nonuniform ground, and there were few cases that pipelines were damaged only by wave propagation. Earthquake field observations did clearly indicate that relatively high strain occurred in pipelines laid through nonuniform ground. In this paper, an updated and detailed review of site effects on seismic behavior of pipelines is presented. For the purpose, quantitative analysis of damage, earthquake field observation, theoretical and experimental study, and related seismic design are discussed, and research needs are pointed out. [S0094-9930(00)01702-9]

Analytical Model for Segmented Pipe Response to Tensile Ground Strain

2016 ◽  
Vol 32 (4) ◽  
pp. 2533-2548 ◽  
Author(s):  
Michael O'Rourke ◽  
Tatiana Vargas-Londono
Keyword(s):  
Cast Iron ◽  
Ground Deformation ◽  
Large Diameter ◽  
Small Diameter ◽  
Seismic Wave Propagation ◽  
Seismic Fragility ◽  
Buried Pipelines ◽  
Empirical Relations ◽  
Permanent Ground Deformation ◽  
Pipe Materials

Seismic fragility relations for segmented buried pipelines have, up to this point, been based almost exclusively upon empirical observations. There are drawbacks with the purely empirical approach, one being the lack of confidence in estimated damage for the more important large diameter pipelines. This paper presents mechanics-based models for small diameter cast iron pipelines subject to tensile ground strains. One model is for small to moderate ground strains (less than .0002) primarily associated with seismic wave propagation. A second model is for larger ground strains associated with the permanent ground deformation hazard. The predicted damage rates from these mechanics-based models are consistent with existing empirical relations for small diameter cast iron pipe. It is expected that in the future, these mechanics-based models can be extended to the more important large diameters and to different pipe materials.

scholarly journals Design of buried flexible pipelines during liquefaction

2018 ◽  
Vol 7 (2.21) ◽  
pp. 259
Author(s):  
Durga Prasad Valleti ◽  
Neelima Sathyam ◽  
S. Sivaranjani ◽  
C. Shahin ◽  
Sneha Mondal
Keyword(s):  
Seismic Design ◽  
Buoyancy Force ◽  
Ground Deformation ◽  
Soil Liquefaction ◽  
Buried Pipelines ◽  
Gujarat State ◽  
The World ◽  
Permanent Ground Deformation ◽  
Abaqus Software ◽  
Surrounding Soil

Pipelines are important facilities over the huge area to encounter a seismic hazards and conditions of soil. In India pipe lines run through high seismic areas and exposed to considerable risk. The pipelines have advanced in India compare through the world scenario there is no uniform guideline available for seismic design. Therefore we need to establish at least degree of safety for standard seismic design of pipelines. As a part of this, a number of flexible pipelines of different diameter, length, and thickness have been taken into consideration. The density, internal pressure and density of surrounding soil are taken into account and is checked against permanent ground deformation (PGD) due to liquefaction. Using ABAQUS SOFTWARE we will analyse the soil pipeline interaction and based on the results obtained some consideration are given for the design of pipeline in the Liquefied zone, which improve the capability of the pipeline to withstand buoyancy force due to soil liquefaction. The safety of buried pipelines is analyzed as per IITK-GSDMA (IIT-Kanpur-Gujarat state Disaster Management Authority) guidelines on seismic design.

Failure Analysis Of Buried Gas Pipelines Crossing Seismic Faults

2020 ◽  
Vol 3 (2) ◽  
pp. 781-790
Author(s):  
M. Rizwan Akram ◽  
Ali Yesilyurt ◽  
A.Can. Zulfikar ◽  
F. Göktepe
Keyword(s):  
Ground Deformation ◽  
Warning System ◽  
Strike Slip ◽  
Gas Pipelines ◽  
Steel Pipes ◽  
Seismic Fault ◽  
Fault Parameters ◽  
Dip Angle ◽  
Permanent Ground Deformation ◽  
Recent Earthquakes

Research on buried gas pipelines (BGPs) has taken an important consideration due to their failures in recent earthquakes. In permanent ground deformation (PGD) hazards, seismic faults are considered as one of the major causes of BGPs failure due to accumulation of impermissible tensile strains. In current research, four steel pipes such as X-42, X-52, X-60, and X-70 grades crossing through strike-slip, normal and reverse seismic faults have been investigated. Firstly, failure of BGPs due to change in soil-pipe parameters have been analyzed. Later, effects of seismic fault parameters such as change in dip angle and angle between pipe and fault plane are evaluated. Additionally, effects due to changing pipe class levels are also examined. The results of current study reveal that BGPs can resist until earthquake moment magnitude of 7.0 but fails above this limit under the assumed geotechnical properties of current study. In addition, strike-slip fault can trigger early damage in BGPs than normal and reverse faults. In the last stage, an early warning system is proposed based on the current procedure. 

Study on Constitutive Modeling for Large Deformation Behavior of Polyethylene Considering Strain Rate Effect

2013 ◽  
Author(s):  
Sijia Zhong ◽  
Jianfeng Shi ◽  
Jinyang Zheng
Keyword(s):  
Strain Rate ◽  
Large Deformation ◽  
Constitutive Modeling ◽  
Deformation Behavior ◽  
True Strain ◽  
True Stress ◽  
Uniaxial Tensile ◽  
Pipeline System ◽  
Composite Effect ◽  
Time Deformation

Polyethylene (PE) pipes have been applied in transportation of key energy medium such as natural gas in the past decades. The mechanical property of PE is of great importance for better design and safer application of PE pipeline system. The large deformation behavior is a key character of PE, not only for its significant strain rate sensitivity, but also for localized necking process after yielding. In this paper, a new constitutive modeling method was proposed to charaterize the rate-denpendent large deformation behavior of PE, in which the true stress is regarded as a function of true stain and true strain rate alone. Uniaxial tensile tests of PE were conducted under various cross-head speeds, and a digital camera was used to record the real-time deformation of specimens. By separating the composite effect into respective effect of local true strain and strain rate on the local true stress in the necking region, a phenomenological model for describing the rate-dependent deformation behavior under uniaxial tension was ealstablished. Model results were validated and found in good agreement with experimental data.

Steel Sheet Shear Walls with Burring Holes for Low- to Mid-Rise Housings

2019 ◽  
Author(s):  
Yoshimichi Kawai ◽  
Shigeaki Tohnai ◽  
Shinichiro Hashimoto ◽  
Atsushi Sato ◽  
Tetsuro Ono
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Large Deformation ◽  
Deformation Behavior ◽  
Steel Sheet ◽  
Shear Walls ◽  
Shear Load ◽  
Finite Element Analyses ◽  
Plane Shear ◽  
Out Of Plane

<p>Steel sheet shear walls with cold formed edge stiffened burring holes are applied to low- to mid-rise housings in seismically active and typhoon- or hurricane-prone regions. A configuration with burrs on the inside and smooth on the outside enables the construction of omitting the machining of holes for equipments and thinner walls with simplified attachments of finishings. In-plane shear experiments and finite element analyses revealed that the walls allowed shear stress to concentrate in intervals between the burring holes. The walls maintained stable shear load and large deformation behavior, and the deformation areas were limited in the intervals and a large out-of-plane waveform in a sheet was effectively prevented owing to edge stiffened burring ribs. The design methods are developed for evaluating the shear load of the walls at story angle from zero to 1/100, using the idea of decreasing the band width of the inclined tension fields on the intervals with the effects of the thickness.</p>

scholarly journals Analysis of Ground Deformation Caused by Subway Tunnel Excavation in Kunming

2021 ◽  
Vol 236 ◽  
pp. 03029
Author(s):  
Ping Wei ◽  
Liuchuang Wei
Keyword(s):  
Ground Deformation ◽  
Horizontal Displacement ◽  
Subway Tunnel ◽  
Buried Pipelines ◽  
Tunnel Excavation ◽  
Protection Measures ◽  
Geological Conditions ◽  
Soil Stress ◽  
Foundation Deformation ◽  
At Home

Research at home and abroad shows that subway excavation often causes soil stress loss, resulting in settlement deformation and horizontal displacement of stratum. Therefore, combined with the special engineering geological conditions in Kunming area, the foundation deformation caused by subway excavation is studied, so as to provide an important foundation for proposing the protection measures of surrounding buildings and buried pipelines and promoting the construction of subway.

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