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This thesis has undertaken extensive field investigation into the response of helical culverts during incremental backfilling and under legal live loads on sinusoidal profile and ribbed profile helical culverts. Deformation, earth pressure and steel strains were measured. The strains were decomposed into hoop force and bending moment. Force-deflection tests were undertaken to determine the effective section properties that took into account the cold-formed section properties and irregularities from rolling during manufacture. High lateral earth pressures were measured during backfilling. A model was developed to demonstrate the formation of those pressures that approach the passive state. This has important implications for the design of buried structures and retaining walls. The response of helical culverts to legal live loads was examined. The effect of vehicle offset and time-dependent effects were considered. Dynamic load allowance was determined. The thesis also examined collapse mechanisms of helical culverts. It is essential that installers fully understand the response during backfilling A simplified design method has been developed which incorporates the maximum crown moment during backfilling. This is the critical load case. The results of the field measurements and numerical modelling have been compared with published literature.

Thesis (M.S.)--West Virginia University, 2004. / Title from document title page. Document formatted into pages; contains x, 71, [49] p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references (p. 68-71).

Thesis (M.S.)--West Virginia University, 2005. / Title from document title page. Document formatted into pages; contains x, 198 p. : ill. (some col.), maps (some col.). Includes abstract. Includes bibliographical references.

Thesis (M.S.)--Montana State University--Bozeman, 2006. / Typescript. Chairperson, Graduate Committee: Joel Cahoon. Includes bibliographical references (leaf 35).

Culverts are designed to carry water from one side of an embankment to another. There are many culverts under a typical highway and they add significantly to its cost. The hydraulic design of a culvert is surprisingly complex and since its primary purpose is to convey water, it is important that it has the full intended flow capacity. The objective of this thesis was to develop a computer program to help an engineer with the hydraulic design of culverts. The user of the program can choose between designing a new culvert or checking the adequacy of an existing culvert from a hydraulic, point of view. The program handles the problem of sediment deposition that can occur and reduce the capacity of culverts having gentle slopes. The most widely used culvert shapes are included in the program and in this thesis. Comments are provided on the conditions under which certain shapes are best. Culvert inlets are given, and some improved inlet designs are presented since the inlet design can have a major impact on the cost of the culvert. Also, erosion at the culvert outlet is discussed and suggestions are provided on how to prevent it or cope with it. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate

Thesis (Ph.D.)--Ohio University, June, 2005. / Title from PDF t.p. Includes bibliographical references (leaves 182-185)

Thesis (Ph.D.)--Ohio University, June, 2005. / Includes bibliographical references (leaves 182-185)

Thesis (M.S. in civil engineering)--University of Texas at Arlington, December 2006. / Includes bibliographical references (leaves 85-86). Also available online.