The composite beams used in aerospace shelters are always exposed to many problems such as: expensive repairing and maintenance costs, and low durability. This research aims to investigate the effect of reinforcing hybrid composite beams with embedded steel-angle truss system (Trussed-beam) inside concrete cover to be used in aerospace structures and shelters. Foremost, a reliable finite element (FE) model was conducted to verify a previous experimental result of a trussed beam, using ABAQUS software. Then, a parametric study was conducted to optimize several parameters, using the reliable FE model. Six composite trussed-beam specimens were modelled to investigate the ultimate flexural capacity. Load-displacement curve was utilized to measure the flexural capacity of the beams. Based on the results obtained from the current study, the composite trussed beam, which is web reinforced by inclined steel Plates, with angle of inclination of 45 degrees obtained significant results relative to the traditional reinforced concrete beam. These hybrid composite beams' flexural behaviour was significantly improved by increasing their compressive strength.