Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Three-dimensional space-defining
Patent
1995-01-09
1997-10-21
Wood, Wynn E.
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Three-dimensional space-defining
526532, 522367, 52637, 527214, E04H 1210, E04H 1214
Patent
active
056783752
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a building framework as well as to a method for the construction of a building framework. In particular, the present invention relates to a steel-constructed framework of a multi-storied building.
BACKGROUND OF THE INVENTION
High quality of prefabricated elements manufactured in a favorable production environment and especially their dimensional accuracy is one of the most obvious benefits of a prefabricated steel framework. A steel framework requires first-class design work. The use of accurate building elements or components facilitates considerably erection of a building framework as well as the other outfitting of a framework. However, the relative market share of building frameworks that are completely made of steel is quite modest. This is due to a number of problems associated with framework systems intended for industrial production.
Swedish publication SE 7113103 discloses a structure for connecting a plurality of horizontal girders to a column for producing a building framework. The top portion of a column of a square cross-section is provided with a square flange surrounding the column and holes for attachment. A horizontal girder of a U-shaped cross-section is placed on top of the column so that the flange of the girder and one side of the square flange of the column will be in cooperation with each other. The slabs are supported on top of the girders i.e., on the top edge of a girder. Thus, it is possible to place a total of four girders on top of a column in parallel with each side of the square
This type of solution involves several problems. It is necessary to place the horizontal girders on the edges of a column, which results in an asymmetric structure whenever the joint includes less than four girders. Thus, the load of the girders on a column will be eccentric tending to bend the column. Also the attachment moments of girders on the support tend to distort the column. The girders in a joint do not create a functional unit but are each separately connected with a supporting column through the intermediary of a flange. Hence, each girder applies individually a load on that flange of a column to which it is attached. When the number of girders is less than four, it is necessary to employ separate spacers mounted on those sides of a column flange having no horizontal girder. Neither is it possible to fill the columns with concrete, since the girders are detached from each other at the junction points. Due to an irregular and asymmetric disposition of the girders, such a structure is suitable neither for the regular modular network of a building framework, nor for the modular dimensioning of building elements.
U.S. Pat. No. 4,125,973 discloses a form assembly comprising sheet metal, hollow, flanged corner joints which telescopically engage the adjoining ends of elongated sheet metal forms for girders and columns. The adjoining structural parts are slidingly fitted and affixed to the corner joint by metal straps. After interconnection the forms are filled with concrete to complete the framework of the building. The rigidity obtainable by the disclosed framework is insufficient for multi-storied buildings. Furthermore, the corner joints are not provided with planar coupling elements. This greatly complicates the construction of the framework in the building site. It is important that the joining surfaces are flat allowing a heavy girder to be simply hoisted in place between two columns.
SUMMARY OF THE INVENTION
An object of the invention is to provide a building framework which is well adapted to prefabrication and which can be quickly erected. Another object is to provide a building framework which primarily comprises conventional, commonly available profiled steel elements.
A steel-constructed building framework of the invention is assembled from columns and girders. The columns have a height which essentially corresponds to the room height in a finished building. The columns are erected floor by floor and the girders are connect
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Horton-Richardson Yvonne
Wood Wynn E.
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