A capacitive sensor configured to be introduced into a construction structure to monitor stresses acting in the construction structure, said capacitive sensor having a multi-layer structure comprising: an upper conductive layer, defining an upper outer surface of said sensor and having a planar extension in a horizontal plane (xy); a lower conductive layer, defining a lower outer surface of said sensor and having a planar extension in the horizontal plane (xy); at least a first layer of insulating material, in contact with said upper conductive layer; at least a second layer of insulating material, in contact with said lower conductive layer; at least a first plate layer, of conductive material, the first layer of insulating material being interposed between the upper conductive layer and the first plate layer; at least a second plate layer, of conductive material, the second layer of insulating material being interposed between the lower conductive layer and the second plate layer; at least one dielectric layer, interposed between said first plate layer and said second plate layer to define at least one detection capacitor inside the multi-layer structure of said capacitive sensor; wherein said upper conductive layer and said lower conductive layer are connected to a common reference potential to jointly define an electromagnetic screen for screening said detection capacitor against electromagnetic interference originating from outside said capacitive sensor, characterized in that said detection capacitor is configured for detection of a pressure acting on the capacitive sensor in a normal direction (z), orthogonal to said horizontal plane (xy), and by comprising a number of brackets coupled to said upper conductive layer and/or to said lower conductive layer, outside the multi-layer structure of said capacitive sensor, wherein each bracket has a coupling portion, for coupling to the surface of the respective upper or lower conductive layer (2a, 2b); a body portion extending from said surface of the respective upper or lower conductive layer (2a, 2b) transversely to this surface; and a head portion, connected to the body portion and extending transversely to said body portion and parallel to the surface of the respective upper or lower conductive layer (2a, 2b); wherein said brackets are attachment elements for the attachment of the capacitive sensor to the material of the construction structure. an upper conductive layer, defining an upper outer surface of said sensor and having a planar extension in a horizontal plane (xy); a lower conductive layer, defining a lower outer surface of said sensor and having a planar extension in the horizontal plane (xy); at least a first layer of insulating material, in contact with said upper conductive layer; at least a second layer of insulating material, in contact with said lower conductive layer; at least a first plate layer, of conductive material, the first layer of insulating material being interposed between the upper conductive layer and the first plate layer; at least a second plate layer, of conductive material, the second layer of insulating material being interposed between the lower conductive layer and the second plate layer; at least one dielectric layer, interposed between said first plate layer and said second plate layer to define at least one detection capacitor inside the multi-layer structure of said capacitive sensor; wherein said upper conductive layer and said lower conductive layer are connected to a common reference potential to jointly define an electromagnetic screen for screening said detection capacitor against electromagnetic interference originating from outside said capacitive sensor, characterized in that said detection capacitor is configured for detection of a pressure acting on the capacitive sensor in a normal direction (z), orthogonal to said horizontal plane (xy), and by comprising a number of brackets coupled to said upper conductive layer and/or to said lower conductive layer, outside the multi-layer structure of said capacitive sensor, wherein each bracket has a coupling portion, for coupling to the surface of the respective upper or lower conductive layer (2a, 2b); a body portion extending from said surface of the respective upper or lower conductive layer (2a, 2b) transversely to this surface; and a head portion, connected to the body portion and extending transversely to said body portion and parallel to the surface of the respective upper or lower conductive layer (2a, 2b); wherein said brackets are attachment elements for the attachment of the capacitive sensor to the material of the construction structure.