Multi-scale Simulation of Time- Dependent Deformation Behavior of Reinforced Concrete Bridge Decks with 3-Dimensional Material-Structure Coupled Analysis
| dc.contributor.advisor | Esayas, Gebreyouhannes (PhD) | |
| dc.contributor.author | Erkeno, Yohannes | |
| dc.date.accessioned | 2020-11-24T05:22:12Z | |
| dc.date.accessioned | 2023-11-11T12:56:32Z | |
| dc.date.available | 2020-11-24T05:22:12Z | |
| dc.date.available | 2023-11-11T12:56:32Z | |
| dc.date.issued | 2020-02 | |
| dc.description.abstract | A concrete structure subjected to a load deform in both immediate and with time. Timedependent deformations are caused by the coupled effect of sustained stress and stress due to environmental conditions (temperature and relative humidity). The effects of these actions are a basic creep, drying creep and shrinkage. In this research, the time-dependent deformation behavior of the T-girder bridge deck due to the coupled effect of sustained truckload and environmental conditions was investigated by material-structure coupled analysis. A full 3-dimensional T-girder deck was modeled, discretized and analyzed in finite element package DuCOM-COM3 for material-structure coupled analysis. The standard truckload, annual average ambient temperature and relative humidity of Addis Ababa and Semera were used for this study. The results of this study indicated that temperature and relative humidity significantly affect the strength and deformation properties of the concrete. For the mix design of the compressive strength of 30MPa, incorporating the effect of temperature and humidity, the compressive strength of 42MPa was attained at the environmental condition of Addis Ababa with an annual average temperature of 23.5°C and relative humidity of 64.2%. For the same mix, the strength reduces to 30MPa at the environmental condition of Semera with an annual average temperature of 34.3°C and relative humidity of 47.7%. Deformation of interlayer pores and incomplete hydration due to moisture migration at an early age was observed as the cause for the strength reduction and increase in deflection of girder in the long term. It was observed that with the effect of ambient temperature and relative humidity, the increase in mid-span deflection up to 4 times as large as the value due to only sustained load without the effect of environmental conditions. The results have shown that the deformation of interlayer pores at an early age crack was found significant for the larger size. The reduction in strength properties of the girder deck up to 14% was observed when compared to the cube specimen at a temperature of 34.3°C and relative humidity of 47.7%. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/23456 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Multi-scale modeling | en_US |
| dc.subject | Time-dependent deformation | en_US |
| dc.subject | Creep | en_US |
| dc.subject | Shrinkage | en_US |
| dc.subject | Environmental conditions | en_US |
| dc.subject | Moisture migration | en_US |
| dc.subject | DuCOM-COM3 | en_US |
| dc.subject | Material-structure | en_US |
| dc.title | Multi-scale Simulation of Time- Dependent Deformation Behavior of Reinforced Concrete Bridge Decks with 3-Dimensional Material-Structure Coupled Analysis | en_US |
| dc.type | Thesis | en_US |