This paper investigates the effects of construction errors during the implementation of reinforced concrete T-beams. These errors are classified into two main sections. The first focuses on the position and ratio of reinforcing bars, while the other is related to the concrete strength. A total of ten specimens of T-beams were tested to assess the effect of the possible defects in the construction sites, viz. impact of misplacement of slab reinforcement, irregular arrangement of slab reinforcement, the change in bar diameter of slab reinforcement and the effect of casting method of concrete on the structural behavior of T-beam sections. The results indicated that the faulty placement of slab reinforcement leads to a lower bending moment capacity of the slab (brittle behavior) and the steel strain of slab decreases as the height of slab reinforcement decreases. The irregularity of the reinforcing bars in concrete slab affects the ultimate load carrying capacity of the slab. Also, it was found out that well-arranged distribution of reinforcement improves the ductile behavior of the slab and reduces the corresponding deflections.
Insufficiency of the Beam Column Joint (BCJ) caused structures failures particularly in case of the earthquakes. In most of the buildings, the beam center line was not aligned with the column center line. So, the effect of the eccentricity of the beam was studied in this article. Behaviour of reinforced concrete (RC) eccentric beam-column joint under reversible cyclic loading was investigated experimentally. The experimental program is one specimen. The specimen consisted of column and beam. The column divided into symmetry two parts (upper and lower parts). The beam fixed in middle of the column and it was free end. The main parameter was the effect of the eccentricity of the beam center line about the column center on behaviour of RC BCJ. The specimen was tested under reversible ten cycles. The horizontal displacement for the column and the vertical deflection at free end of the beam were recorded at each cycle. The crack pattern of the tested specimen was studied at every cycle in details. It was noticed that the eccentricity of the beam has concentrated more stresses on the joint side close to the eccentricity. The failure took place at the joint due to its weakness.
This search represented tests of reinforced concrete beams were tested in laboratory for shear strength. Beams consisted of six of reinforced concrete beams without stirrups, one with Rsec and five with T-sec, with variable flange width to web width ratio. All beams were loaded under two identical point load till failure. During loading of beams deflection was measured, steel strain at mid span, steel strain at mid shear span, stains at inclined strut, and strain at upper flange. Code equations usually does not account for the contribution of the flange of the T-sec while experimental research indicated enhanced shear strength for beams with flange. Test results of this research indicated an enhance of shear strength ranging from 10-30% due to the contribution of the flange.
A beam-column joint is a very critical zone in reinforced concrete framed structure where the elements intersect in allthree directions.There are practical difficulties involved in theconstruction of reinforced beam-column joints.In this review to focus on the general behaviour of reinforced concrete Beam-Column joints (BCJ); exterior, interior and at top floor. Previous research work presented studying BCJ under gravity and seismic loads in addition to the effect of many parameters on the mechanical behaviour of BCJ. The current study investigated the effect of reinforcement configuration, eccentricity, the joint aspect ratio (hR b R/hR c R), concrete compressive strength, and the compressive column axial load.BCJ classification was introduced according to ACI 318-02 (2002) and Egyptian code (2007). The equations and recommendations related with BCJ in national codes were reviewed.
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