Date of Award


Degree Type


Degree Name



Civil and Environmental Engineering


Engineering, Civil.




The method of Finite Strip is modified and applied to the three dimensional analysis of rib stiffened soil-steel structures. The strips are oriented in the curved direction, so that the effect of stiffeners is determined by considering them as individual strips. The eccentricity of the stiffened section is incorporated in the displacement functions to satisfy the continuity of the shell between the strips. The surrounding soil is replaced by the spring analog model. The spring coefficients are dependent on the type and depth of soil and the direction of wall displacement. Displacement functions are developed to model a soil-steel structure during side filling and under the traffic loads. The developed formulation has been verified by the laboratory scale model tests as well as by prototype test results. It has been observed that the provision of stiffeners at closer spacing (say 1.0 m c/c) in the upper zone of the conduit has considerable effect in reducing the conduit deformation and the combined stresses during construction. However, if the stiffeners are widely spaced (say 2.75 m c/c or more) the bending load carrying capacity of the stiffened upper zone is increased but slightly when compared with the capacity of non-stiffened conduits. The practice of analysing the conduit as a plane structure is found to be approximately valid if the ratio of conduit radius (R) to stiffener spacing (S) is greater than 0.6. If S/R (LESSTHEQ) 0.2, the stiffeners are considered to be fully acting with the main shell, while for 0.2 < S/R < 0.6, the stiffeners are considered to be partially acting with the main shell. A simplified two-dimensional analysis procedures are suggested for stiffened soil-steel structures during and after backfilling. The failure tests of a laboratory scale model indicated that the stiffeners have considerable effect on the overall buckling of the conduit but little effect on the local buckling in the zone between the stiffeners, especially when localized live load is applied.Dept. of Civil and Environmental Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1986 .E543. Source: Dissertation Abstracts International, Volume: 47-05, Section: B, page: 2081. Thesis (Ph.D.)--University of Windsor (Canada), 1986.