US2439129A - Building column - Google Patents

Description

Patented Apr. 6, 1 948 .ATENT OFFICE BUILDING coLU N John Stanley Donahue, Brookline, Mass and George E. .Strehan, LeoniagNal; said .Strehan. :assignor to said Donahue Application April 18, 1945, Scria'l'No; 588,954

This invention relates to reinforced structural columns of the cylindrical, concrete-filled type commonly used in building construction, and pertains more particularly to improvements in bracketed columns having beam-supporting wings or plates welded thereto.

The principalpurpose of the invention is to provide a column having a bracket plate secured thereto i-n such a manner that it is capable of adequately withstanding the three types of stresses to which the column and bracket are normally subjected, namely: rotational stress upon the plate caused by the floor-supporting beam attached thereto: compressional stress up on bracket; and lateral bulging or bursting stress upon the column casing, caused by the vertical pressures of beams or cap plates on the concrete core.

Recommended embodiments of the invention are shown inthe. accompanying drawings, but it will be understood that the structural details of the devices herein illustrated and described may be varied to suit particular conditions without departing from the essence of this invention as defined in the appended claims. the drawings,

Fig. 1 is a fragmentary elevation of a column having a bracket plate secured thereto in accordance with one form of the invention, the column casing being broken away andthe concrete filling being omitted;

Fig. 2 is a section on line 2-2 of'Fig. 1;

Fig. 3 is aview similar to 1, showing a modified form of bracket connection and beam support;

Figs. 4 and 5 are sections on lines 4-4 and 5-5, respectively, of Fig. 3;

Fig. 6 is a view similar to Fig. 1 showing an other modified form of bracket connection;

Fig. '7 is a section on line 1-1 of Fig. 6;

Fig. 8 is a side view of a column provided with a further modified form of bracket; and

Fig. 9 is a section on line 9-9 of Fig. 8.

In each of the figures, the beam connecting bracket comprises a compression plate having curved arms Welded to the exterior of the column casing and equipped, if desired, with laterally projecting flanges to which a beam-supporting plate or the beam itself may be bolted or otherwise fastened, or on which the beam end may rest; and in each figure, the type of beam for which the respective brackets are adapted is shown in broken lines. It will be understood, however, that a compression plate consisting of a single arcuate member, with or Without attached lateral flanges between its curved arms, will 5111-.

4 Claims. (c1. lea-42).

the for certaininstallations; for the beam-supporting platemay be welded directly to the compression plate the projecting flanges are omitted; i i i l i In the embodiment illustrated in- Figs. -1 and 2, the tubular column casing H, which is normally filled With concrete or other plastic core material, has a vertical slot to-receive the inner margin or web-l2 of a bracket plate I 3, the top or ,the plate having e. notch Hi defininga lug or tension toe l5 which is hooked behind the casing wall when the web I2 is inserted in the casing slot by an upward rotational movement. The plate l3 has an extension orcompressi'orrheel lit-,depending' below the casing slot and bearing against compression plates having curved arms H- to whichthe heel this bolted, welded or otherwise rigidly fastened. The web i2 is preferably welded in the casing slot. as described initial-1y Patents 1,432 192 and 1,537,833. 1 i

In the" arrangement shown, the extension heel is secured and braced between a pair of laterally projecting flanges or tugs l8 integral with the respective arms N which conform to the curvature of the casing. The'heeli6 is secured to said flanges by bolts [9 or other fastening means. The arms H of the duplex compression plates are welded to the casing, asindicatedat 20.

The outwardlyprojecting portion of the bracket plate may have openings 21 to receive bolts whichfattach the beam 22 thereto, as usual; and a column bracket of the character described will afford adequate support for the beam and the weight carried thereby. Rotational stress upon the projectin plate is resisted by the tension toe l5, compression stress is borne by the heel Iii, and bursting stress is restrained by the arms H which also assist in offsetting rotational and compressional stresses and thus serve as a compensating medium upon which the different stresses react in opposite directions.

In the modified embodiment of Figs. 3 to 5, the plain bracket plate 23 is inserted in a slot of the casing 24 to which it is welded; and the beam 25 attached thereto, is additionally supported by curved arms 25 welded to the exterior of the column and having their lateral flanges 21 welded together and provided with cap plates 28, integral therewith or attached thereto, on which the bottom of the beam end 25 is seated.

In Figs. 6 and 7, the bracket plate 29 is inserted in and welded to the casing 35, substantially as shown in Figs. 3 to 5; and the curved arms 3! have their lateral flanges 32 welded to the oppo- 3 site sides of the plate in the central region thereof.

In the further modification of Figs. 8 and 9, the lateral flanges 32 of the curved arms 33 constitute the bracket plates between which the web of beams 34 is directly bolted, the curved arms 33 of the duplex compression plate being welded to the exterior of the casing as aforesaid. Although this bracket construction is less effective than those previously described, it afiords adequate support for beams carrying relatively light loads.

The bracketed building columns herein disclosed, and more particularly the construction shown in Figs. 1 and 2, afford a simple, practical and economical means for securely supporting heavy beam loads and efiectively resisting the various stresses which tend to distort the column casing or displace the bracket plates mounted thereon. The curved arms of the compression plates which constitute an important feature of this invention, extend a substantial distance around the column casing, involving not less than ninety degrees of the column circumference; and

-it will be understood, as aforesaid, that a unitary compression 'plate having one or more laterally projecting flanges and integral curved arms extending therefrom in both directions, may feasibly be employed in some cases, in place of the pair of the duplex compression plates herein illustrated.

We claim:

1. In a cylindrical building column, a bracket comprising a, beam-supportingplate, and a pair of compression plates each having a, curved arm fitting the exterior of the column and welded thereto, said compression plates having laterally projecting flanges disposed on opposite sides of said beam-supporting plate and fastened thereto, the column having a metal casing provided with a vertical slot, and the beam-supporting plate having a web inserted into the column through said slot and welded therein.

2. In a cylindrical building column, a bracket comprising a beam supporting plate, and a pair of compression plates each having a curved arm fitting the exterior of the column and welded thereto; said compression plates having laterally projecting flanges disposed on opposite sides of said beam-supporting plate and fastened thereto, the column having a metal casing provided with a vertical slot, and, the beam-support- 4 ing plate having a web inserted into the column through said slot and welded therein, the upper edge of said Web having a notch receiving a portion of said casing and an interior tension toe, and the bottom of said beam-supportin plate having an extension depending below said slot and bearing against the exterior of the casing to provide a compression heel, said flanges being fastened to said heel.

3. In a building column having a tubular metal casing formed with a vertical slot, a beam-supporting bracket comprising a plate adapted to be attached to the beam, the plate having a web inserted into the column through said slot and 'Welded therein, the upper edge of the plate havan extension depending below said slot to provide a compression heel, and a compression plate Welded to the casing and secured to the compression heel, to receive and distribute the thrust of said heel.

4. In a building column having a hollow metal casing filled with a plastic core, and formed With a vertical slot, a beam supporting bracket comprising a web plate with a tension toe at the top projecting into said slot and bearing against the interior of said casing, said plate having an extension depending below said slot to form an extension heel, and a' compression plate welded to the casing below the column slot and substantially conforming to the contour of the column casing and defining an arc of at least ninety degrees around the column perimeter, the extension heel of the web plate being rigidly secured to the compression plate so. as to effectively distribute all shearing and bearing stresses on the column casing.

JOHN STANLEY DONAHUE. GEORGE E. STREHAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,515,257 Krasnow Nov. 11, 1924 1,173,418 Ette -Feb. 29, 1916 1,791,897 Hyde et a1 Feb. 10, 1931 2,146,333 Deming Feb. 7, 1939

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