Joist floor systems are commonly used in the Middle East region as a typical construction practice in multi-story buildings. In such system, reinforced concrete (RC) wide beams are fundamental components, and they may not only carry the load transmitted from their own floor but they may also carry heavy loads transmitted from upper floors via planted columns. Wide beams featuring planted columns are sometimes designed and/or constructed with insufficient shear reinforcement, which makes them susceptible to brittle shear failure, thus threatening the lives of people. In current research, the performance of wide beams featuring planed columns were experimentally and numerically investigated. In this regard, two large-scale wide beams with planted columns were tested under three-point flexure. The first specimen was designed without transverse shear reinforcement to simulate the worst-case scenario of wide beams constructed without stirrups. However, in the second specimen, the shear reinforcement was designed as per current code requirements for comparison with the first specimen. The response of the tested beams was compared with regard to failure mode and load-deflection characteristics. Additionally, three-dimensional (3D) nonlinear finite element (FE) analysis was conducted using ABAQUS software to predict the behavior of tested beams. Good agreement was found between the experimental and numerical results. Adding code-complying shear reinforcement in the wide beam significantly improved the peak load and dissipated energy by 93% and 520%, in turn, compared with the specimen without shear reinforcement.