CA1147928A

CA1147928A - Structural steel connections

Info

Publication number: CA1147928A
Application number: CA000369271A
Authority: CA
Inventors: Ivan Copf
Original assignee: Individual
Current assignee: Individual
Priority date: 1981-01-26
Filing date: 1981-01-26
Publication date: 1983-06-14

Abstract

A B S T R A C T

This invention consists of a connection between a column and a horizontal and diagonal structural beam and a connection at the intersection of two crossing diagonal beams. The beams involved are of the wide flange type, the we]ded wide flange type, and the hollow structural section. In the connection to the column, a gusset plate is introduced between the column and the beam. This gusset plate is thicker than the web of the beam. The connection at the intersection of the diagonal beams consists of providing a boxed-in section in one of the beams through which passes the other diagonal beam, and is contained therein.

Description

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_ P E C I F I C A T I ~ N

This invention belongs gene:rally to the design of structural steel used in the erection of frameworks for buildings, bridges, and a large variety of other types of structures where a steel framework is required, in order to support very heavy loads or wi-thstand grea-t stresses.
In particulart this inven-tion refers to newl useful7and improved methods of joining or connecting hori-zontal anddiagonal steel members, of the hollow or wide flange shapes, to vertical steel columnsi and to a method of connecting the intersection of two crisscrossing diagonal steel members.
At the present time, the steel construction industry is plagued by the rapidly rising cost of material, labor, and financing interest rates. A large percentage of the cost of construction is consumed in connecting the various members of the structure, to each other, and the fabrication of such connections. This is especially true in the case where wide flanged shapes, welded wide flanged shapes, and shapes havi~g hollow sections are used.
It is, therefore, the primary object of this in-vention, to provide an efficient connection, when the above n~med steel shapes and sections are involved, at a greatly reduced fabrication and instal]ation labor cost, reduced material cost, reduced ~rawing cost, and design cost, as compared to mehtods used, prior to this invention.
In describing the invention, the various steel sections will be referred to by the following symbols,-W - for wide flange shapes WW - for welded wide flange shapes HSS - for hollow structural sections.
~eference will also be made to the following draw;ngs in which,-:~ ~ f~7~

Figure 1 is an elevation of a horizon-tal and a diagonal beam connection to a column, Figure 2 shows section A-A of Figure 1, Figure 3 is section B-B of Figure 2, showing a hollow shape, HSS, Figure 4 shows a section B-B where wide flange shape W is used, Figure 5 shows the offset of the centerlines of the column and the connection, Figure 6 shows a connection at the crossing point, between two crossing, diagonal members, and Figure 7 shows section C-C of Figure 6.
The joint shown in Figures 1 to 5, inclusive, shows a~.-typical c`onnection of a horizontal beam 2 which may be a W, or WW section, to a column r~ which may be of a ~, WW, or HSS section and a diagonal beam 3, which may be an HSS, or W section, attached to the same column 1. This joint consists of two vertical, and spaced angles 7, which are attached to -the column I, and hold between them the end of the horizontal beam 2, and a vertical gusset plate 4. This pla-te is of a greater thickness than the web of -the beam 2, so that a fill plate or shim 8 has to be provided to make up for the thick-ness difference. To the end of the beam 3 is attached, by welding a T section 5, which is usually cut from a W section, as required; and the T section is attached to the gusset plate 4 by means of field bolts 9. The T section 5 is further strengthened by a pa.ir of stiffener plates 6,6.
In Figures 6 and 7 is shown the crossing poin-t connection between two crossing diagonal, HSS beams 10, and 11, which rnay be -ties or any o-ther par-ts of a structure. In this case, one of the crossing beams, beam 11, is split into two parts; wi.-th sufficient space between the two parts to

-2--allow the passage of beam ~0, througA that space. To each end of the beam 11, which form -the said split, is attached a plate 12, and to each side of the p]ates 17, is bolted a channel 13, toeing outwardly, thus forming a boxed in area hrough which passes the beam 10 wherein it fi-ts snugly9 or is welded to the con-tinuous beam 10~
From the above ~lescription it can be seen -that for a single gusset plate bracing connection f`or H~S and W shapes, an increase of connection capacity can be accomplished simply by increasing the thickness of the gusset plate abo~e the web thickness of the beam.
Other advantages in the use of the invention consist of,-(al- A simplified -type o* joint, (b) No reduction of diagonal capacity, i.e. connection capacity = Member capacity.
(c) Reduced shop facrication time.
(d) Simplified erection.

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Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:-

1. A connection of a horizontal and a diagonal beam to column, said beams being of the wide flange shapes, welded wide flangeshapes, or hollow structural sections, comprising in combination, a pair of spaced, back to back angles which are attached to said column, by bolts, rivets, or welding; the web of the horizontal beam being located and held between, and at the bottom of said angles; a gusset plate, which is located at the upper part of said angles, and held between them, by bolts, rivets, or welding; the bottom of said gusset plate being welded to the upper flange of the horizontal beam, and said gusset plate being of a greater thickness than the web of said beams; a diagonal beam, to the ends of which is welded the horizontal part of a "T" section, so that the vertical part of the "T" is bolted or riveted to said gusset plate; a pair of stiffener plates, welded to the vertical part of the "T", one on each side thereof; and a filler plate or shim inserted between the said angles and the web of the horizontal beam, to make up for the difference in thickness between the said gusset plate, and the web of the horizontal beam.