Investgation of Effects of Imperfection and Their Significance in Analysis Results
| dc.contributor.advisor | Zekeria, Adil(PhD) | |
| dc.contributor.author | Tadesse, Haimanot | |
| dc.date.accessioned | 2018-06-19T06:29:35Z | |
| dc.date.accessioned | 2023-11-11T12:53:55Z | |
| dc.date.available | 2018-06-19T06:29:35Z | |
| dc.date.available | 2023-11-11T12:53:55Z | |
| dc.date.issued | 2007-02 | |
| dc.description.abstract | Structural systems are prone to global as well as member imperfections in geometry. These imperfections are accounted for when considering structural stability and strength requirements of both sway and non-sway frames. In the first part of this thesis, stability of imperfect systems is examined. With the intention of understanding the ideas necessary to tackle more practical aspects of instability, stability of equilibrium are first introduced by analysis of the behavior of some simple mechanical systems. Existence of imperfection cause the maximum load to be attained to fall below the critical value and the larger the imperfection, the larger is this reduction. The bifurcation point defines the form of instability of a structural system. For simple mechanical systems, the behavior of the imperfect system is governed by the magnitude and the sign of the imperfection and also the critical load of the system without imperfection. In systems with more than one degree of freedom, it is the fundamental mode and load which governs the elastic portion of the behavior frames possessing imperfection. The pattern of imperfection of form and loading, considered as a whole determines the mode of buckling. To evaluate strength requirements of imperfect structural systems, the imperfection effects are quantified in terms of an initial sway imperfection at the base of the column and then converted to equivalent horizontal forces. Analysis is carried out which includes these equivalent horizontal forces and the maximum bending moment in columns and beams for frames with varying number of bays and number of stories are examined. For a fixed number of stories, the effect on maximum bending moment in beams decreases with increasing number of bays. The effect on columns is not as large as that on beams but is still significant for high rise buildings. For fixed number of bays the percentage increase rises with the story height. | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/1466 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Results | en_US |
| dc.title | Investgation of Effects of Imperfection and Their Significance in Analysis Results | en_US |
| dc.type | Thesis | en_US |