US2930221A - Head plate for structural columns - Google Patents
Head plate for structural columns Download PDFInfo
- Publication number
- US2930221A US2930221A US607385A US60738556A US2930221A US 2930221 A US2930221 A US 2930221A US 607385 A US607385 A US 607385A US 60738556 A US60738556 A US 60738556A US 2930221 A US2930221 A US 2930221A
- Authority
- US
- United States
- Prior art keywords
- plate
- columns
- head
- column
- head plate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/185—Connections not covered by E04B1/21 and E04B1/2403, e.g. connections between structural parts of different material
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
- E04B1/215—Connections specially adapted therefor comprising metallic plates or parts
Definitions
- This invention relates to improvements in headplates or frames for structural columns used in monolithic, fireresistant buildings in which a floor slab of reinforced concrete or the like is poured in place around the supporting columns.
- Channel type head frames designed for this general purpose are disclosed in my Patent No. 2,033,595, dated March 10, 1936, and in the'Donahue and Strehan Patent No. 2,469,455, dated May 10, 1949.
- the head frame is rigidly secured to the top of a well known type of prefabricated structural column comprising a steel casing filled with concrete.
- Such framed columns are adaptable and adequate for all building conditions; they are'easy to install and maintain; they present minimum obstruction to light and air and obviate bulky columns and bulging projections under the panel joints of a flat slab floor; and they afford other practical advantages which are explained in the patents just mentioned.
- the principal purpose of the invention is to provide a head frame of relatively simple and economical construction, comprising a pair of fiat steel plates rigidly secured together and, to the ends of upper and lower concretefilled columns, and reinforced by shear and bond rods which are preferably welded to one of the plates and so disposed that portions of the rods may be-bent to most effective position after the upper column is installed and before the concrete slab is poured.
- the improved, reinforced head plate serves to transmit to the connected columns that portion of the movement of the rigid frame, based on the relative rigidity of the columns and the intersecting bands of the concrete slabs at the panel joint; and to transmit the total panel load to the column in shear, while reducing the shear in the slab to a small percentage of the ultimate compressive strength of the concrete.
- a further object of the invention is to provide a reinforced head plate having projections, preferably formed by portions of the reinforcing rods, on its under side, which serve as ties to prevent cracking or spalling of the concrete in which the plate is embedded; and having rod projections above the plate, which are adequate to resist the horizontal shear in the slab in both directions, thus ensuring the rigidity of a fixed hinge and preventing differential movement between the column head and the floor slab.
- Fig. 2 is a plan view of the head plate.
- Four pieces of reinforcing rod are bent in the form of loops 21, having crossed ends with end portions 22. The end portions of each are welded to plate 11 adjacent one of its edges.
- a number of studs 23 are welded or riveted to the under side of plate 11. Plate 11 and the loops are assembled on to column 14 at the factory, with loops 21 bent out to the general position indicated by the dotted outline 24 in Fig. 1.
- loops 21 are bent to an inwardly inclined position overlying plate 12, and the floor slab is then cast around the head plate assembly.
- the composite head plate thus consists of relatively small steel shapes, and is wholly embedded and concealed Within the normal thickness of the concrete floor slab 16.
- the cross-sectional area of the column head should be such that the total panel load is transmitted to the column in shear; and the lateral dimensions of the head plate should be suflicient to reduce the shear in the slab to ap I proximately three percent of the ultimate compressive strength of the concrete.
- the section modulus of the plate should be adequate to transmit that portion of the total negative moment resisted by the columns in proportion to the relative rigidity factors of the columns.
- the total cross-sectional area of the steel reinforcing rods, above the plate 11, should be adequate to resist the horizontal shear of the slab in both directions.
- the plates 11 and 12 are preferably square when used as the head frames of interior columns, one or more sides of the plate 11 may be partially cut away for use on exterior columns or in corners. It will also be understood. that the ultimate angular position of the inwardly bent loop portions will depend upon the requirements of the particular installation.
- a column head constructed as herein described is easy and economical to fabricate and to assemble with the concrete filled. columns; it affords adequate rigidity,
- a head frame assembly embedded in a concrete slab and connecting two prefabricated structural columns disposed one above the other comprising: a first fiat head plate attached to the lower column, having a central portion resting on the lower column and overhanging side portions extending outward into the slab around the base of the upper column; a second plate attached to the base of the upper column and mounted directly on the firstv plate, said side portions of said first plate extending outward beyond said second plate, and a plurality of reinforcing rod loops having ends attached to said side portions of the first plate, said loops extending obliquely inward and overhanging the second plate and forming a reinforcing network around the base of the upper coldirectly on said first plate, said side portions of said first plate extending outward beyond said second plate; and a plurality of closed loops of reinforcing rods having ends fixed to said side portions, said loops having bendable Patented Mar 29,1960
Description
March 29, 1960 e. E. STREHAN 2,930'221 HEAD PLATE FOR STRUCTURAL COLUMNS Original Filed Oct. 20, 1951 HEAD PLATE FOR STRUCTURAL COLUMNS George E. Strehan, Leonia, N.J., assignor to Lally Column (30., Cambridge, Mass., a corporation of Massachusetts Original application October 20, 1951, Serial No. 252,273, now Patent No. 2,768,520, dated October 30, 1956. Divided and this application August 31, 1956, Serial No. 607,385
2 Claims. (CI. 72-15) This invention relates to improvements in headplates or frames for structural columns used in monolithic, fireresistant buildings in which a floor slab of reinforced concrete or the like is poured in place around the supporting columns.
This application is a division of my co-pending application Serial No. 252,273, filed October 20, 1951 and now issued as Patent No. 2,768,520. 7
Channel type head frames designed for this general purpose are disclosed in my Patent No. 2,033,595, dated March 10, 1936, and in the'Donahue and Strehan Patent No. 2,469,455, dated May 10, 1949. In the latter patent, the head frame is rigidly secured to the top of a well known type of prefabricated structural column comprising a steel casing filled with concrete. Such framed columns are adaptable and adequate for all building conditions; they are'easy to install and maintain; they present minimum obstruction to light and air and obviate bulky columns and bulging projections under the panel joints of a flat slab floor; and they afford other practical advantages which are explained in the patents just mentioned.
The principal purpose of the invention is to provide a head frame of relatively simple and economical construction, comprising a pair of fiat steel plates rigidly secured together and, to the ends of upper and lower concretefilled columns, and reinforced by shear and bond rods which are preferably welded to one of the plates and so disposed that portions of the rods may be-bent to most effective position after the upper column is installed and before the concrete slab is poured.
The improved, reinforced head plate serves to transmit to the connected columns that portion of the movement of the rigid frame, based on the relative rigidity of the columns and the intersecting bands of the concrete slabs at the panel joint; and to transmit the total panel load to the column in shear, while reducing the shear in the slab to a small percentage of the ultimate compressive strength of the concrete.
A further object of the invention is to provide a reinforced head plate having projections, preferably formed by portions of the reinforcing rods, on its under side, which serve as ties to prevent cracking or spalling of the concrete in which the plate is embedded; and having rod projections above the plate, which are adequate to resist the horizontal shear in the slab in both directions, thus ensuring the rigidity of a fixed hinge and preventing differential movement between the column head and the floor slab.
Additional advantageous features of the improved head plate will become apparent from the following description of the recommended embodiments of this invention shown on the accompanying drawing, in which:
Fig. 1 is a fragmentary section of a floor slab at the panel joint, showing portions of the assembled upper and lower columns and the head plate in elevation; and
Fig. 2 is a plan view of the head plate.
As shown in the drawings, a flat plate 11, welded to nited States Pate'nt O the top of the lower column 14, is rigidly connected 'by riveting, welding, or other means, as at 13, to a smaller fiat plate 12 which is welded to the lower end of the upper column 15. Four pieces of reinforcing rod are bent in the form of loops 21, having crossed ends with end portions 22. The end portions of each are welded to plate 11 adjacent one of its edges. A number of studs 23 are welded or riveted to the under side of plate 11. Plate 11 and the loops are assembled on to column 14 at the factory, with loops 21 bent out to the general position indicated by the dotted outline 24 in Fig. 1. On the job, after the upper column has been set in place, and plate 12 secured to plate 11, loops 21 are bent to an inwardly inclined position overlying plate 12, and the floor slab is then cast around the head plate assembly.
The composite head plate thus consists of relatively small steel shapes, and is wholly embedded and concealed Within the normal thickness of the concrete floor slab 16. The cross-sectional area of the column head should be such that the total panel load is transmitted to the column in shear; and the lateral dimensions of the head plate should be suflicient to reduce the shear in the slab to ap I proximately three percent of the ultimate compressive strength of the concrete.
The section modulus of the plate should be adequate to transmit that portion of the total negative moment resisted by the columns in proportion to the relative rigidity factors of the columns. The total cross-sectional area of the steel reinforcing rods, above the plate 11, should be adequate to resist the horizontal shear of the slab in both directions.
Although the plates 11 and 12 are preferably square when used as the head frames of interior columns, one or more sides of the plate 11 may be partially cut away for use on exterior columns or in corners. It will also be understood. that the ultimate angular position of the inwardly bent loop portions will depend upon the requirements of the particular installation.
A column head constructed as herein described is easy and economical to fabricate and to assemble with the concrete filled. columns; it affords adequate rigidity,
strength and resistance to shear, and is firmly bonded to the floor slab; and it is compact, relatively light in weight, and convenient to install in meeting the requirements of flat slab building construction.
What is claimed is:
1. A head frame assembly embedded in a concrete slab and connecting two prefabricated structural columns disposed one above the other, comprising: a first fiat head plate attached to the lower column, having a central portion resting on the lower column and overhanging side portions extending outward into the slab around the base of the upper column; a second plate attached to the base of the upper column and mounted directly on the firstv plate, said side portions of said first plate extending outward beyond said second plate, and a plurality of reinforcing rod loops having ends attached to said side portions of the first plate, said loops extending obliquely inward and overhanging the second plate and forming a reinforcing network around the base of the upper coldirectly on said first plate, said side portions of said first plate extending outward beyond said second plate; and a plurality of closed loops of reinforcing rods having ends fixed to said side portions, said loops having bendable Patented Mar 29,1960
1 3 portions which are free of said first plate and extend 1,550,316 obliquely inward and overhang thesecond plate, thereby 1,625,899 forming a reinforcing network around the base of the 2,562,601 upper column. 2,768,520
References Cited in theme of this patent 5 UNITED STATES PATENTS 971,665 Conzelman 0ct.. 4, 1910 4 Hardison Aug. 18, 1925 Lally Apr. 26, 1927 Caquot et a1 July 31, 1951 Strehan Oct. 30, 1956 FOREIGN PATENTS Sweden Oct. 16, 1912
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US607385A US2930221A (en) | 1951-10-20 | 1956-08-31 | Head plate for structural columns |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US252273A US2768520A (en) | 1951-10-20 | 1951-10-20 | Head plate for structural columns |
US607385A US2930221A (en) | 1951-10-20 | 1956-08-31 | Head plate for structural columns |
Publications (1)
Publication Number | Publication Date |
---|---|
US2930221A true US2930221A (en) | 1960-03-29 |
Family
ID=26942186
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US607385A Expired - Lifetime US2930221A (en) | 1951-10-20 | 1956-08-31 | Head plate for structural columns |
Country Status (1)
Country | Link |
---|---|
US (1) | US2930221A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110192108A1 (en) * | 2008-02-18 | 2011-08-11 | Baro Construction Key-Technology Co., Ltd. | Grid-type drop-panel structure, and a construction method therefor |
EP2851479A3 (en) * | 2013-02-12 | 2015-06-03 | Ancotech Ag | System for reinforcement against crushing with rods or transverse bars having anchoring heads |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US971665A (en) * | 1909-11-16 | 1910-10-04 | Unit Construction Co | Concrete construction. |
US1550316A (en) * | 1921-05-24 | 1925-08-18 | Kalman Steel Co | Flat-slab construction |
US1625899A (en) * | 1923-05-17 | 1927-04-26 | Lally John | Fireproof building construction |
US2562601A (en) * | 1942-07-03 | 1951-07-31 | Dubois | Tanks adapted to contain liquids or gases |
US2768520A (en) * | 1951-10-20 | 1956-10-30 | Lally Column Co | Head plate for structural columns |
-
1956
- 1956-08-31 US US607385A patent/US2930221A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US971665A (en) * | 1909-11-16 | 1910-10-04 | Unit Construction Co | Concrete construction. |
US1550316A (en) * | 1921-05-24 | 1925-08-18 | Kalman Steel Co | Flat-slab construction |
US1625899A (en) * | 1923-05-17 | 1927-04-26 | Lally John | Fireproof building construction |
US2562601A (en) * | 1942-07-03 | 1951-07-31 | Dubois | Tanks adapted to contain liquids or gases |
US2768520A (en) * | 1951-10-20 | 1956-10-30 | Lally Column Co | Head plate for structural columns |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110192108A1 (en) * | 2008-02-18 | 2011-08-11 | Baro Construction Key-Technology Co., Ltd. | Grid-type drop-panel structure, and a construction method therefor |
US8549805B2 (en) * | 2008-02-18 | 2013-10-08 | Baro Construction Key-Technologies Co., Ltd. | Grid-type drop-panel structure, and a construction method therefor |
EP2851479A3 (en) * | 2013-02-12 | 2015-06-03 | Ancotech Ag | System for reinforcement against crushing with rods or transverse bars having anchoring heads |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2969619A (en) | Reinforced hollow concrete building panel | |
US2477256A (en) | Cantilever floor structure | |
US2744589A (en) | Wall-panel structure | |
US2768520A (en) | Head plate for structural columns | |
US2050609A (en) | Wall construction | |
US2930221A (en) | Head plate for structural columns | |
WO1982001025A1 (en) | Box beam reinforced concrete structure | |
JP3106881B2 (en) | Mixed structure of reinforced concrete columns and steel beams | |
US11332928B2 (en) | Panel of compound sheets for the construction of light-weight one-way joist slabs | |
JP2747678B2 (en) | Composite beam | |
US2001162A (en) | System of building construction | |
KR20190124561A (en) | Connecting sturcture between column and wide beam and floor structure | |
US2014087A (en) | Construction of buildings and the like | |
US2697930A (en) | Slab supporting frame for reinforced concrete building construction | |
KR102129130B1 (en) | Composite deck plate for adhering z-shaped latticed bar, and manufacturing method for the same | |
US1979642A (en) | Beam | |
JPH0521522Y2 (en) | ||
US3286415A (en) | Reinforced shell construction | |
US2705886A (en) | Prefabricated, reinforced floor structure | |
US2230430A (en) | Building construction | |
JPH11152905A (en) | Earthquake resistant reinforcing method for existing building and earthquake resistant reinforcing structure | |
KR102450003B1 (en) | Assembly of composite girder | |
JPH0751803B2 (en) | Seismic retrofitting method for RC structure opening | |
US3283461A (en) | Integrated concrete slab and supporting plate box structure | |
CH641229A5 (en) | Heat- and sound-insulated prefabricated wall element of reinforced concrete |