Abstract: The composite structure made of wood and reinforced concrete can be used for bridges, roofs etc. In a bridge, a plate of reinforced concrete carries the roadway and rests on a truss comprising lower and upper chords, transversal girders and struts made of wood and posts made of reinforced concrete. The lower struts are reinforced with steel ties, follow a bent curve and are anchored in lateral end sections. Forces in the wooden parts all extend along the wood's fibre, which increases the maximum load capacity. The concrete posts allow a simple assembly of the wooden elements. The weight of the construction is low, its load bearing capacity high.

Abstract: The composite structures are composed of wooden members such as girders of laminated wooden boards and members of reinforced concrete such as a plate of reinforced concrete which form for instance a composite load supporting structure designed as pedestrian walkway or similar structure. In order to interconnect the members of wood themselves or to members made of reinforced concrete fitted set bolts or fitted screw bolts, respectively, are arranged in such a manner that they extend through the cross sections of the wooden members and are anchored at least in one cross section of reinforced concrete. The parts consisting of reinforced concrete are poured as a rule after the assembling of the wooden structure such that deviations of dimensions can be equalized or taken up, respectively, quite easily. This allows a combining of the advantages of wooden structures and of structures made of reinforced concrete.

Abstract: In a domed support structure, especially for roof construction, a compression dome is arched in lengthwise direction in a catenary configuration. A tension dome is further arranged either side by side or below the compression dome and is also arched in lengthwise direction in a catenary configuration. The compression and the tension domes are provided with a compression sheating and a tension sheating, respectively. The compression sheating is formed to have a high buckling strength. To this end the compression sheating is arched also in a direction transverse to said lengthwise direction. The arched shape is defined and maintained by corresponding transverse beams which function as stiffening or shaping elements but do not support any load caused by the own weight of the sheating. Such forces are transmitted by the sheating itself directly onto the bearings of the structure at its lengthwise ends.

Abstract: In a domed support framework tension domes and the compression domes are arranged side-by-side, neighboring domes thereby being arched oppositely with respect to one another. The tension domes and compression domes are carried by common intermediate supports and outer supports. Transversely to the doming direction continuous tension elements are spanned between the outer supports, extending in a funicular polygon or in a catenary configuration alternatingly through the tension domes and longitudinal extensions of the compression domes and being guided over the intermediate supports. Each tension element is frictionally connected with reinforcement ribs of the compression domes and with roof from elements of the tensions domes. The tension elements cause deflection forces which in each dome compensate for the opposed arch pressure forces. Thereby a horizontal force balance between neighboring tension and compression domes is achieved by simultaneously transmitting the vertical forces to the supports.

Abstract: A domed support framework or truss comprises, as the roof form elements, wooden members oriented in the direction of doming and interconnected with one another so as to be tension-proof in such direction. The therebetween extending reinforcement ribs are likewise tension-proof wooden or timber elements. At their ends the roof form elements of the tension dome are frictionally connected with a tension element which extends in a polygon or catenary configuration between two supports to the same dome side and is guided over such supports in the compression dome. At that location the tension element is anchored at the extension of the compression dome. This construction compensates the horizontal thrust of the domed support framework, by virtue of the anchoring of the tension elements, without loading the roof form elements in the transverse direction, and thus, renders possible the use of materials which only can be loaded in one direction in tension, such as for instance wood.

Abstract: A prestressed steel support structure and method of erecting the same having bearing supports and containing at least one tension element having at least one hollow profile member extending in a catenary configuration between support locations and within which there is arranged at least one prestressing cable. The hollow profile member is provided with a filler and the prestressing cable forms a connection with the hollow profile member by means of such filler.

Abstract: A method of manufacturing a support framework or truss having at least one suspension element arched in one direction and serving as a roof construction, formed from concrete poured at the site or from prefabricated components, comprising forming a reinforcement construction taking-up the horizontal forces and composed of two horizontal supports arranged in spaced relationship from one another and extending transversely with respect to the arching direction of the suspension element, and which horizontal supports are laterally interconnected by means of reinforcement components, and supporting the thus formed reinforcement construction upon supports. Tension elements for the suspension element are arranged in a spatial curve extending in a catenary configuration between the horizontal supports and are anchored at the region of the supports at the reinforcement construction.