How Construction Errors Affecting the Bearing Capacity of the Concrete Beams? Inelastic Deflection of Concrete I-Beams
Khalilimard Hussein
Khalilimard, Hussein, PhD. Student of Civil Engineering, Faculty of Structural Mechanics, AZUAC, Azerbaijan University of Architecture and Construction, Baku, Azerbaijan.
Manuscript received on March 21, 2014. | Revised Manuscript received on April 16, 2014. | Manuscript published on April 30, 2014. | PP: 9-16  | Volume-3, Issue-4, April 2014. | Retrieval Number:  C2700023314/2013©BEIESP

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Abstract: Reinforced concrete I-beams are widely used in bridge construction. The span length to beam height ratio in these decks is sometimes between 15 and 30. Due to the widespread utilization of these bridges and their heavy traffic loads, special attention must be directed at recognizing the behaviors that lead to construction errors associated with these structures. Because of various construction and environmental factors, construction faults might result in concrete quality or during concrete placement which can consequently lead to inhomogeneities in beam sections. This means that concrete density and compressive strength in the beam cross section might deteriorate along the section height. Extensive research has been conducted on the non-linear and inhomogeneous behavior of concrete beams. However, few researchers have specifically addressed density and compressive strength variations along beam cross sections. The present research is aimed at estimating from elastic material parameters, the concrete I-beam inelastic deflection resulting from inhomogeneous behavior along the beam cross sectional height. The behavior of the beam under study was checked by comparing its relevant parameters with the results obtained from the Open Sees Software and the method proposed in the Concrete Code ACI318. Excellent agreement was observed in both cases. Moreover, a value of unity was proposed for parameter “n” in the relation set forth by Branson in the Concrete Code ACI318 for estimating section cracking moment in long span I-beams.
Keywords: Inelastic Deflection, Concrete Beam, Inhomogeneity, Cracked section, Construction errors.