“Tension Property of Concrete and its Role in the Immediate Deflection of Reinforced Concrete Beam under Serviceability Limit State”
| dc.contributor.advisor | Gebreyouhannes, Esayas (PhD) | |
| dc.contributor.author | Tadesse, Yisshak | |
| dc.date.accessioned | 2018-07-31T06:17:53Z | |
| dc.date.accessioned | 2023-11-11T12:56:52Z | |
| dc.date.available | 2018-07-31T06:17:53Z | |
| dc.date.available | 2023-11-11T12:56:52Z | |
| dc.date.issued | 2015-12 | |
| dc.description.abstract | Modeling the behavior of cracked tensile concrete is a complicated issue. Due to bond with reinforcement, the concrete between cracks carries a certain amount of tensile force normal to the cracked plane. The concrete adheres to reinforcement bars and contributes to overall stiffness of the structure. The phenomenon, called tension-stiffening, has significant influence on the results of short-term deformational analysis. The main objective of this thesis is to investigate the current norms of calculating deflection and propose a free-of-shrinkage deflection calculation alternative that incorporates tension-stiffening law for flexural reinforced concrete (RC) members subjected to short-term loading. It consists of an introduction, four Chapters and general conclusions. Reasons for investigation and main objective are discussed in the first Chapter. The second Chapter presents literature review on deformational models of RC members. Furthermore design code and numerical methods for determining deflections of reinforced concrete members are reviewed. The third Chapter presents the current practice of calculating deflection along the span of a beam. This is accomplished by taking a representative simply supported beam with expected set of loads acting on it. The influence of shrinkage is not included to emphasize on the role of the concrete in tension of RC members subjected to short-term loading. A numerical procedure has been carried out for computing free-of-shrinkage deflection of the beam using the current two most prevalent codes; ACI 318 and EC2, as well as prominent deflection calculation approach (Bischoff’s Method). The fourth Chapter presents the findings of an experimental investigation as a stepping stone to point out the role of concrete in the tension zone of a reinforced concrete section under flexure. Also two approaches are discussed to include the tension stiffening effect. First, the effective stiffness approach where the modulus of elasticity of steel is modified to incorporate the tension stiffening role, and later the modeling of the post–crack tensile property of concrete and quantify its effect in relation to the area of concrete in the tension zone. This is followed by a proposed method of using the two approaches to come up with a procedure to compute the deflection of RC beam which is more practical and refined. The result of the approach is compared with that of the results computed in Chapter three. The fifth Addis Ababa University Addis Ababa institute of technology-AAiT School of Civil and Environmental Engineering Page 2 of 72 Chapter presents the comparison and discussion of the predictions made in Chapter three and four and the proposed model. Recommendations are expressed at the end of the Chapter. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/10552 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Structures | en_US |
| dc.title | “Tension Property of Concrete and its Role in the Immediate Deflection of Reinforced Concrete Beam under Serviceability Limit State” | en_US |
| dc.type | Thesis | en_US |