A Comparative Study of Beams on Elastic Foundations Using Available Subgrade Models
| dc.contributor.advisor | Asrat, Worku (PhD) | |
| dc.contributor.author | Beza, Tesfu | |
| dc.date.accessioned | 2020-12-14T08:35:11Z | |
| dc.date.accessioned | 2023-11-11T12:51:18Z | |
| dc.date.available | 2020-12-14T08:35:11Z | |
| dc.date.available | 2023-11-11T12:51:18Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | Soil-structure interaction (SSI) is present in every problem, wherein a structural element is in contact with soil. A concrete beam supported directly by the soil continuum is a very common construction form. The response of the beam when it carries external load is influenced by the soil, and the response of the soil is also influenced by the action of the beam under the load. Thus, developing a subgrade model for soil-structure interaction problem is essential in order to predict the response of both components of the system and arrive at an optimum design. The simplest subgrade model is the single parameter Winkler mechanical model which represents the foundation soil by a series of independent springs. Winkler model is widely used and practiced in spite of its deficiency in depicting the continuous behavior of real soils. Later, many advanced mechanical subgrade models have been proposed in order to improve on the inherent lack of shear interaction among the individual springs. Moreover, these models still have shortcomings with the nature of simplifying assumptions they make to ease the mathematical relationships and not suggesting ways of estimating the model parameters. With the objective to improve on such drawbacks, a generalized continuum-based model has been recently proposed by Worku. This generalized subgrade model satisfies the fundamental elastic laws and all the boundary conditions because it is derived by considering all stress, strain and displacement components. The main objective of this work is to make a comparative study between existing single and two parameter selected subgrade models. Microsoft Excel programs are written for the computation of deflection, moment and shear force. Finite Element based Plaxis 2D is used as a tool to determine the calibration factor for generalized models. Lastly, numerical illustration is provided using these models in comparison with the Plaxis 2D model and other simplified models for finite and infinite beam subjected to selected symmetrical loading conditions. The results of the comparison show that the generalized models especially the two-parameter model, are in very good agreement with the FE Plaxis 2D outputs. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/24025 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Subgrade Models | en_US |
| dc.subject | Beams | en_US |
| dc.subject | Elastic Foundations | en_US |
| dc.title | A Comparative Study of Beams on Elastic Foundations Using Available Subgrade Models | en_US |
| dc.type | Thesis | en_US |