Structural system for building and civil engineering works and construction method

A two-way structural system for construction, comprising:

• a panel-shaped base part (1) with a plurality of longitudinal channels (1.1) and a plurality of transverse channels (1.2) that are evenly distributed;
• a stiffening part (2) with a plurality of longitudinal sheets (2.1) and a plurality of transverse sheets (2.2) that are evenly distributed and joined together in the form of cross bars, and with a plurality of holes (2.3) distributed along the sheets (2.1, 2.2);
• wherein both the panel-shaped base part and the stiffening part (1 and 2) are made of fibre-reinforced polymer (FRP) material, and
• wherein the stiffening part (2), in an operational position, is connected by resting on the panel-shaped base part (1) and fitting into the corresponding plurality of longitudinal and transverse channels (1.1, 1.2), defining a cavity in the plurality of longitudinal and transverse channels (1.1, 1.2) between both the panel-shaped base part and the stiffening part (1, 2) to be filled with fibre-reinforced concrete through the plurality of holes (2.3), forming a monolithic assembly once the concrete has set, and both the panel-shaped base part and the stiffening part (1.1, 1.2) are configured to form a self-supporting structure that is reinforced and becomes stiffer when a subsequently poured concrete is set.