One of the advantages of flat glass is its extremely high compressive strength, which can reach up to 1000 MPa. Because of the significantly lower glass tensile strength, the high compressive strength of the glass remains unexploited when the glass elements are loaded in bending and one side of the element experiences the tensile stresses. One of the options to increase the tensile strength of the glass is through the process of the glass fiber production. The tensile strength of glass fibers is in the range of 2500 MPa and 4500 MPa which is significantly higher in comparison to any other glass product. By combining both, flat glass sheets and glass fibers with a concept similar to conventional reinforced concrete beams we present in this paper the innovative post-tensioned beam. The beam is assembled with the series of flat glass sheets stacked together along the longitudinal axis of the beam which is oriented perpendicularly to the surfaces of the stacked glass sheets. At the bottom of the proposed glass beam cross section is a hole along the whole length of the beam for the installation of the continuous glass fiber rope which is used for the post-tensioning and to facilitate the tension stresses. Based on the numerical simulation and the preliminary experimental analysis of the individual components and their interactions we can conclude that the proposed idea present a potential for a beam completely made of glass with a high load bearing capacity. However, some limitations and guidelines for further research are also discussed.