Abstract
When the flange of a reinforced concrete spandrel beam is in tension, current design codes and specifications enable a portion of the bonded flexure tension reinforcement to be distributed over an effective flange width. The flexural behavior of the RC L-shaped spandrel beam when reinforcement is laterally displaced in the tension flange is investigated experimentally and numerically in this work. Numerical analysis utilizing the finite element method is performed on discretized flanged beam models validated using experimentally verified L-shaped beam specimens to achieve study objectives. A parametric study was carried out to evaluate the influence of various factors on the beam’s flexure behavior. Results showed that as the percentage of the reinforcement distributed has increased over a greater width of the flange, a considerable drop in beam flexure strength was observed with excessive deflection. According to the study, not more than 33% of the web tension reinforcement might be distributed over an effective flange width less than ln/10, including the web region, as recommended by the ACI318-14.
Highlights
IntroductionT and L-Shaped flanged beams are commonly encountered in usual construction
Et al, 2017 investigated the flexural behavior of RC rectangular and T-beams strengthened with CFRP laminates using NSM technique and to provide direct analysis method for the evaluation of the flexural strength of FRP reinforced concrete beams
The results indicated that the experimental deflection values were greater than those obtained using the finite element model
Summary
T and L-Shaped flanged beams are commonly encountered in usual construction. Et al, 2017 investigated the flexural behavior of RC rectangular and T-beams strengthened with CFRP laminates using NSM technique and to provide direct analysis method for the evaluation of the flexural strength of FRP reinforced concrete beams. The developed equations were compared with experimental results available in the literature and proven the effectiveness of the presented design equations for estimating the flexural capacity of the investigated sections strengthened with CFRP laminates strips. This study aims to address a practical issue that arises in usual practice when bonded tension reinforcement is distributed in the tension flanges of L-shaped beams as allowed by the (ACI 318M-19) design code to protect the flange's outer parts from excessive flexure cracks. The influence of tension reinforcement distribution will be discussed and highlighted when the flexural behavior of such beams is investigated
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