US1563119A - Fabricated structural member - Google Patents

Description

Nov 24,1925. I 1,563,119

J. E. TONNELIER FABRICATED STRUCTURAL MEMBER Filed April 17. 1924 I l l 1 I 1 2 1 gnvento'f 114 4 6H0: "enrol J. EDMUND TUNNELIER, 0]? PITTSBURGH, PENNSYLVANIA, ASSIQNOR TO J'QNES dz LAUGHLIN STEEL CORPORATION, OF PITTSBURGH, PENNSYLVANIA, A CORPORA- 'JLION OF PENNSYLVANIA.

FA'ElR-ICATED STRUCTURAL MEMBER.

To all whom it may concern.

Be it known that l, J. EDMUND ToNNuLInR, a citizen of the United States, residing at f Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented an limprovement in Fabricated Structural Members, of which the following description, in connection with the accompanying drawings,

is a specification, like characters on the drawings representing like parts.

My invention aims to strengthen and improve roll-ed structural members or shapes of open web or trussed form, and to enable such members to be readily and economically fabricated and utilized for building and other urposes.

In t e accompanying drawings, wherein it have shown one embodiment of my invention for purposes of illustration,

Fig. 1 is a side view of a trussed web I- beam such as is suitable for floor beams, roof trusses and purlins, bridge girders, and other structural purposes;

Fig. 2 is an enlarged side view of one end of the beam shown in Fig. 1; Fig. 3 is an end view of the same; and

Fig. 4 is a horizontal cross-section of the end portionof the beam on the line 4-4 in Fig. 2, Figs. 2, 3 and {i being drawn to the same scale.

The invention may be applied to I-beams, channels, Z-sections, T-sections, H-sections, and other shapes with and without flanges, having'trussed or open web port-ions formed integrally with the flan or margins. In rolling such structural s apes the web portions (which may be in the form of tie members) are most readily made of uniform strength and are equally spaced lengthwise of the shape; This distribution of web members is not suitable for developing the maximum strength of the sections under all conditions of load,'as the tie members subjected to compression stress will buckle and fail under a muchlighter load than those subjected to tension stress.

Also, in using such shapes, they may require to be cut at points between the panel points, i. e., the ends of the tie members, thereby leaving the free ends of the flanges unsupported and weak; and they may be called upon to support'concentrated loads, s for example, at the points of support of cross-beams, or where they intersect walls.

' lln such and many other cases, provision may advantageously be made to prevent collapse of the shape at unsupported or highly stressed points by additional bracing for the web portions capable of resisting compression, bending and shearing stresses.

lihe particular embodiment of the invention selected for illustration herein and shown in the drawings comprises stifieners, of any suitable cross-section, preferably of channel shape, for reenforcing the ends and intermediate points of lattice-web structural shapes, especially such as are liable to be subjected to compression-stresses, but other shapes and forms of stifl'eners and points of reenter-cement are contemplated.

Referring particularly to Fig. 1, the invention is embodied in a trussed I-beam having flanges 12 connected by angularly disposed lattice or web members 13 formed integrally with the flanges by any suitable process of manufacture. Each end of the beam is strengthened by securing thereto suitable stifieners or reenforcement, such as the channel plates 14, which are preferabl disposed-0n opposite sides of the downwar ly and outwardly inclined web members of the beam at or adjacent to its ends, and may have end portions 15 parallel to and near the lower flange. In the form of theinvention "shown in the drawing, inclined stiffeners 16,

preferably of channel shape, are secured on both sides of the corresponding web members of the anels near the ends of the beam.

At their en s, these stiffeners are secured to the stein portions of the flanges. Intermediate points may be likewise strengthened by inclined stiifening members similar to the stifi'eners 16 for bracing tie members subject to excessive compression stresses under peculiar conditions.

The preferred manner of securing stiffener plates to the web portions of the beam is by spot welding, although'any suitable means for attaching the members rigidly together may be used.

A further advantage of the end stifi'eners is that the ends of the beam may be cut ofi to reduce its length or suit the conditions of use without weakening the beam. Any free end portions of incomplete tie members at the ends of the beams may advantageously tions of the, supporting structure.

The invention is not restricted to the forms, shapes and dimensions of the members shown in the drawings, as it, is obvious that it may be applied in various forms and shapes suitable to the uses for which it is adapted.

What I claim asmy invention and desire to secure .b Letters Patent is:

1. A roli ed shape having an open work web strengthened by diagonally extending stiffening bars rigidly secured to the compression Web members.

2. A rolled shape of the character described having a web comprising inclined tie members strengthened by plates secured thereto on opposite sides in regions subject to. compression stresses.

3. A rolled shape having fian es connected by tie members integral therewith forming panels of intersecting tension and compression tie members, and stiffening members secured to said compression members in panels adjacent tothe ends'of said shape.

4. A rolled shape having flanges connected by tie members integral therewith forming panels of intersecting tension and compression tie members, and end braces having portions disposed parallel to the lower flange on opposite sides thereof and secured thereto, said braces having portions extending diagonally to the upper flange along and secured to the adjacent compression tie members.

- 5. A rolled shape having a web comprising integral, diagonally disposed tie members of uniform size for the tension and com ression regions, and diagonally extendin races secured to the opposite sides of sand compression tie members,

6. A flanged rolled shape having a web comprising integral, dia onally disposed tie members connecting sai flanges at spaced points forming panels, the compression members of sa d panels having len hwise extending braces secured thereto an to the ends of adjacent tie members and having a shape resisting bending.

' 7. A rolled shape having a web comprising integral, diagonally disposed compression tie members having lengthwise extending braces spaced apart inwardly from its ends and having portions secured to theends of adjacent tie members.

8. A rolled shape having upper and lower flanges and a web comprising integral, diagonally disposedcompression tie members, lengthwise extendin braces secured to said tie members, said races having diagonal portions secured to the upper flange at their inner ends, and horizontally disposed portions secured to the lower flange at their lower ends constituting stifleners for the ends of said shape. i v

9. A rolled shape having marginal flanges and an open-Work web comprising integral, diagonally disposed compression tie members, and lengthwise extending braces secured to selected compression tie members in regions of excessive compression stress.

10. A rolled shape having flanges 11 and an open web comprising tie members 12, end stiffeners 14 secured to the endmost compression tie members and having end portions 15 parallel to the flanges and secured along the lower flange, and intermediate stifleners 16 secured to the tie members in regions of excessive compression stress.

In testimony whereof, I have signed my name to this specification.

JJEDMUND TONNEL'IER.

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