Experimental Investigation on the Effect of Un-Bonded Longitudinal Steel Reinforcement on Flexural Responses of RC Beams
| dc.contributor.advisor | Abrham, Gebre (PhD) | |
| dc.contributor.author | Fekadu, Debela | |
| dc.date.accessioned | 2021-09-06T04:42:21Z | |
| dc.date.accessioned | 2023-11-11T12:56:40Z | |
| dc.date.available | 2021-09-06T04:42:21Z | |
| dc.date.available | 2023-11-11T12:56:40Z | |
| dc.date.issued | 2021-08 | |
| dc.description.abstract | This paper is devoted to the combined effect of unbounded length and steel bar diameter on the flexural responses of reinforced concrete beams. A test series of eight simply supported beams having varied un-bounded lengths that bond loss starts at the middle and extends toward the supports had been performed in this experiment. All beams have a total span of 1220mm and are loaded at the middle with one concentrated load. One of the main assumptions in the deigning of the reinforced concrete member is the efficient concrete-steel bond mechanism. But, loss of bond due to factors, such as errors during repairing, construction errors, corrosion, rough and dry formwork, formation of voids, etc. that may reduce the carrying capacity of the reinforced concrete beams and flexural behavior in general. Therefore, bond-slip has much attention from academic areas and industries. An experimental program is conducted to examine the effect of variable un-bonded length of longitudinal reinforcement for bottom reinforcement with different bar diameters on the flexural capacity of reinforced concrete beams, with shear reinforcement, subjected to transverse point load. The bond loss was provided with plastic tubes covering the longitudinal reinforcement by allowing bonded length over supports which prevent the formation of bond-slip at support. The effect of un-bonded length with different bar diameters on the response, cracking load, ultimate load capacity, ultimate mid deflection, and deflection at service load of beams is discussed in this paper. The cracking load and cracking pattern, ultimate load capacity, and ultimate deflection are highly affected by increasing bond loss length for 16mm bar diameter. But, the ultimate load-carrying capacity of beams with a bar diameter of 8mm for the same length of bond loss was 7.31% even for fully unbounded. This may be attributed to the good bond strength of small bar diameter (8mm) than that of large bar diameter (16mm), in addition to the bond around the end supports and the presence of the anchorage | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/27804 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Beams | en_US |
| dc.subject | tensile strength | en_US |
| dc.subject | bond strength | en_US |
| dc.subject | concrete | en_US |
| dc.subject | flexural strength | en_US |
| dc.subject | reinforced concrete | en_US |
| dc.subject | Deflection | en_US |
| dc.subject | ultimate capacity | en_US |
| dc.title | Experimental Investigation on the Effect of Un-Bonded Longitudinal Steel Reinforcement on Flexural Responses of RC Beams | en_US |
| dc.type | Thesis | en_US |