Abstract: In antiseismic steel structural works of the frame type or of the truss type, which are constituted by columns and by girders fastened to the columns, the girders of different shapes show, at least in the vicinity of one of their extremities, a dissipative zone constituted by a reduction of the actual cross section. The reduction of the actual cross section consists either in differently shaped indentations in the edges of the flanges of the girder or in round or polygonal holes which are regularly distributed over the flanges and have a small diameter.

Abstract: A fireproof construction element has a plurality of integrally interconnected and parallel profile beams each having a longitudinally extending outer flange defining an outer surface and a longitudinally extending web extending inwardly from the flange. The webs are each formed adjacent the flange with a row of at least generally longitudinally extending, elongated, and laterally throughgoing slots. The beams form a plurality of outwardly open channels laterally bounded by the flanges. Respective masses of concrete substantially fill the channels between the webs and inward of the flanges and have outer surfaces contiguous with the outer surfaces of the beam flanges. The slots can be provided in two rows with the slots of one row overlapping and staggered with the rows of the other row.

Abstract: A beam support joint for a column and a beam, which are each constructed from concrete and at least one metal section having a pair of flanges joined by a web and forming at least one recess of the metal section which is filled with concrete and the outer surfaces of the flanges of the metal section are not covered with concrete and are otherwise free. An upper support strap is mounted on an upper flange of the beam, and is attached to the column and the beam. The upper support strap and the webs of both the beam and the column all lie substantially in the same plane. On a flange of the column a lower support plate is advantageously welded which has a width corresponding approximately to the flange of the column. This lower support plate has at least one recess on its upper side which suitably engages at leat one projection provided on a lower flange of the beam.

Abstract: A composite structural element comprises a steel structural shape whose web is provided with one or more steel plates secured thereto by welding or bolting and embedded in the concrete filling the channels between its flanges. The concrete may also include a reinforcement secured to the plate. With a relatively simple structure the system has increased load-carrying capacity even under fire conditions.

Abstract: A composite structural element has a main steel beam having a web and at least two flanges extending therefrom, having oppositely directed outer faces, having outer edges generally defining a plane and defining with the web a recess open away from the web between the outer edges. A mass of concrete fills the recess substantially to the plane, the outer flange faces being exposed and substantially free of concrete. Another profiled steel beam is fixed to the web of the main beam and wholly imbedded in and covered by the concrete mass. Typically the main beam is an H- or I-beam and has two such channels provided with such other beams and filled with respective such masses. The other beams can be of T-section or each other beam can be an I- or H-beam. In addition it is possible to provide longitudinally extending steel reinforcing bars imbedded in the concrete mass. Steel fibers can also be imbedded as reinforcement in the concrete mass, and this mass can be at least partially of colloid concrete.