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Nonlinear Finite Element-based Investigation Of The Effect Of Bedding Thickness On Underground Pipe

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Nonlinear Finite Element-based Investigation Of The Effect Of Bedding Thickness On Underground Pipe

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dc.contributor.author Kararam, Anupong en_US
dc.date.accessioned 2007-08-23T01:56:12Z
dc.date.available 2007-08-23T01:56:12Z
dc.date.issued 2007-08-23T01:56:12Z
dc.date.submitted July 2006 en_US
dc.identifier.other DISS-1390 en_US
dc.identifier.uri http://hdl.handle.net/10106/164
dc.description.abstract The pipe-soil interaction is studied by using the finite element software, ABAQUS/CAE Version 6.5-1 as a symmetric model of embankment installation to study the effect of bedding property and thickness on pipe-soil interaction with increase in the height of fill. A three-dimensional finite element model (FEM) of the concrete pipe and surrounding soil is developed. The FEM is capable of simulating material, geometric, and contact nonlinearities which employs a nonlinear incremental solution algorithm. Several different element types and mesh size were tested to obtain the optimum converged mesh. These elements were eight-noded linear brick (C3D8R) and six-noded linear triangular prism (C3D6) for modeling of the concrete pipe and surrounding soil. The behavior of the 3-D model is investigated by varying the pipe diameter, backfill height, bedding thickness, and bedding material. Three material constitutive relationships of soil involving in the model are gravelly sand (Sn), sandy silt (Si), and silty clay (CL). To study the effect of bedding thickness on the pipe wall, due to the increment of backfill soil depth, contact elements were employed in the interface between each two regions. The lateral boundaries and model length were also studied for the converged solution. A parametric study was conducted to study the effects of bedding thicknesses 3 in (7.5 cm), 5 in (12.5 cm), 7 in (17.5 cm), and 9 in (22.5 cm) with backfill heights 20 ft (6 m), 40 ft (12 m), 60 ft (18 m), 80 ft (24 m), and 100 ft (30 m). The different types of material used for the inside bedding zone are as follows: Si70; Si90; Sn85; and Sn90. The results show the increase in bedding thickness reduces tensile stress at crown, springline, and especially invert of the pipe wall depending on the material property. This means the change in material property and compaction level has a greater effect on the reduction of tensile stresses than the effect from the variation of bedding thicknesses. Also, materials with lower bedding stiffness (high deformability characteristics) cause greater reduction in induced stresses. This study shows that for commonly used bedding material (Sn90), the effect of the increase in bedding thickness has a minimal effect on stress reduction of the pipes studied. en_US
dc.description.sponsorship Abolmaali, Ali en_US
dc.language.iso EN en_US
dc.publisher Civil & Environmental Engineering en_US
dc.title Nonlinear Finite Element-based Investigation Of The Effect Of Bedding Thickness On Underground Pipe en_US
dc.type M.S.C.E. en_US
dc.contributor.committeeChair Abolmaali, Ali en_US
dc.degree.department Civil & Environmental Engineering en_US
dc.degree.discipline Civil & Environmental Engineering en_US
dc.degree.grantor University of Texas at Arlington en_US
dc.degree.level masters en_US
dc.degree.name M.S.C.E. en_US
dc.identifier.externalLink https://www.uta.edu/ra/real/editprofile.php?onlyview=1&pid=958
dc.identifier.externalLinkDescription Link to Research Profiles

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