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|Title: ||EXPERIMENTAL AND ANALYTICAL INVESTIGATION ON CONFINED REINFORCED CONCRETE COLUMN|
|Authors: ||AYELE, MELAT|
|Advisors: ||DR. ING. ADIL ZEKARIA|
|Keywords: ||CONFINED REINFORCED CONCRETE COLUMN|
frequency of earthquake
strength of column
|Copyright: ||Oct-2010 |
|Date Added: ||18-Oct-2012 |
|Abstract: ||The intensity and frequency of earthquake are getting higher and higher during these few years. After different failure observed the importance of enhancing the ductility capacity became essential. The enhancement of strength and ductility in column requires confinement of concrete by transverse reinforcement or other mechanism. In this study, an experimental investigation was conducted to examine the effect of confinement in concrete columns subjected to axial loading. The experimental program include 33 small scale concrete column with 3 type of different geometric arrangement of transverse tie (cross tie, normal and overlapping) of square column and three different number of layer of square and circular column. For each experiment, stress–strain relationship was obtained and compared with models proposed earlier. The test result indicate that the strength of column confined by cross tie, over lapping three layers square and circular specimens confined by wire mesh shows enhancement in strength very significantly. Significant enhancement in peak strain and ductility was observed in specimens confined by wire mesh and cross tie configuration especially specimen having circular cross section confined by three layer wire mesh. Circular and cross tie type of confinement preserve the strength in the descending region of the stress- strain curve and prevent the column from sudden failure after peak load. From all specimens the test result indicates that the cross ties configuration give higher strength and ductility.
From this research due to their higher strength and ductility, in seismic region it is recommended to use that the cross tie configuration and wire mesh with number of layer is more than two. However, due to size and capacity limitation of the machine stress- strain characteristics of experiment results in comparison with of the existing confinement model show considerable deviation in the post strength zones. A better achievement can be obtained by considering actual size of specimens.|
|Appears in:||Thesis - Civil Engineering|
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