US20070245677A1 - Column holdown connection - Google Patents
Column holdown connection Download PDFInfo
- Publication number
- US20070245677A1 US20070245677A1 US11/394,606 US39460606A US2007245677A1 US 20070245677 A1 US20070245677 A1 US 20070245677A1 US 39460606 A US39460606 A US 39460606A US 2007245677 A1 US2007245677 A1 US 2007245677A1
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- US
- United States
- Prior art keywords
- connection
- column
- connector
- holdown
- screws
- 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.)
- Abandoned
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 27
- 239000002184 metal Substances 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 230000000452 restraining effect Effects 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000006424 Flood reaction Methods 0.000 description 1
- 206010061217 Infestation Diseases 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
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- 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
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
-
- 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
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
- E04B2001/2463—Connections to foundations
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- 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
- E04B1/26—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of wood
- E04B1/2604—Connections specially adapted therefor
- E04B2001/268—Connection to foundations
- E04B2001/2684—Connection to foundations with metal connectors
Definitions
- This invention relates to a connector for anchoring a first building structural member to a second building structural member.
- the connector works in conjunction with a separate anchor member that is received by or is attached to the second building structural member and fastener means for attaching the connector to the first building structural member.
- the anchor member which is attached to the second structural member, attaches at the seat of the connector. This seat is connected to a back member.
- the back member attaches to the first building structural member, generally a stud in a framed wall.
- Most holdown connectors have one or more side members to increase the strength of the connector or to connect the seat member to the back member.
- the holdown connector of the present invention is specifically designed to fit within a restricted space. In order to do so, it uses a plurality of bolts in order to achieve relatively high load resistance. However, in the preferred embodiment, testing has revealed that the bolts alone would be insufficient to adequately resist rotation and deflection and a connection made with bolts alone would therefore be inadequate.
- the bolts are augmented with screws that resist rotation and deflection in a novel combination.
- An object of the present invention is to provide a connection between a metal column and an underlying structural member. This object is achieved by providing a connector that is fastened to the metal column in a unique manner, using both bolts and screws.
- An object of the present invention is to provide a connection between an I-beam and an underlying structural member. This object is achieved by providing a connector that attaches to the web of the I-beam.
- An object of the present invention is to provide a connection between an I-beam and an underlying structural member that does not interfere with adjacent structural members. This object is achieved by providing a connector that fits between the side members of the I-beam.
- An object of the present invention is to provide a connection between an I-beam and an underlying structural member that resists rotation and deflection. This object is achieved by providing a connector that attaches to the web of the I-beam with bolts and screws spaced to either side of the bolts.
- An object of the present invention is to provide a connection between a metal column and an underlying structural member that is both quick and easy to make. This object is achieved in part by using self-drilling screws.
- An object of the present invention is to provide a connection between a metal column and an underlying structural member that is inexpensive. This object is achieved in part by providing a connector that can be made from sheet steel.
- An object of the present invention is to provide a connection between a metal column and an underlying structural member that resists fire, corrosion and infestation. These objects are achieved by providing a connection that can be made entirely out of metal and concrete.
- FIG. 1 is a perspective view of a connection formed in accordance with the present invention.
- FIG. 2 is a top plan view of the connector of the present invention.
- FIG. 3 is a front elevation view of the connector of the present invention.
- FIG. 4 bottom plan view of the connector of the present invention.
- FIG. 5 is a back elevation view of the connector of the present invention.
- FIG. 6 is a left side elevation view of the connector of the present invention.
- FIG. 7 is a right side elevation view of the connector of the present invention.
- FIG. 8 is a cross-section view of a connection formed in accordance with the present invention.
- FIG. 9 is a cross-section view of the column and connector of the present invention.
- the present invention is a column holdown connection 1 in a building 2 .
- the connection 1 comprises, basically, an underlying structural member 3 , an anchor 4 , a substantially vertical metal column 6 , and a holdown connector 8 .
- the anchor 4 is restrained by the underlying structural member 3 .
- the anchor 4 has an attachment end 5 protruding above the underlying structural member 3 .
- the substantially vertical metal column 6 has a bottom end 7 supported by the underlying structural member 3 .
- the holdown connector 8 has a back member 9 and a seat member 10 .
- the back member 9 is fastened to the column 6 with a plurality of bolts 11 and a plurality of screws 12 .
- the seat member 10 is restrained by the attachment end 5 of the anchor 4 .
- the underlying structural member 3 is a foundation 3 . More preferably, the foundation 3 is cementitous. In the most preferred embodiment, the foundation 3 is concrete reinforced with steel rebar. Alternatively, the underlying structural member 3 could be the floor 3 of an upper storey. In such a case, the anchor 4 could be restrained through a second holdown connector 8 , an arrangement common in floor-to-floor connections.
- the anchor 4 is preferably an anchor bolt 4 , specifically a 7 ⁇ 8 inch anchor bolt.
- the anchor is a bent steel bolt 3 embedded in a ferroconcrete foundation 3 .
- the seat member 10 of the holdown connector 8 is formed with an anchor opening 13 through which the attachment end 5 of the anchor 4 passes.
- the attachment end 5 of the anchor 4 preferably has helical threads 14 and a nut 15 is threaded onto the helical threads 14 , thereby restraining the attachment end 5 against the seat member 10 .
- the attachment end 5 of the anchor 4 could be welded to the holdown connector 8 or otherwise fixed.
- the column 6 is preferably an I-beam 6 with a central, substantially planar web member 16 having a first side 17 and a second side 18 , a first substantially planar side member 19 and a second substantially planar side member 20 .
- the first side member 19 and the second side member 20 are generally perpendicular to the web member 16 and extend beyond both the first side 17 and the second side 18 of the web member 16 to create a pair of back-to-back channels 21 .
- the column 6 could be a hollow, tubular column 6 or even a thick, solid block 6 .
- the column 6 is formed with a plurality of bolt openings 22 in the web member 16 adjacent the bottom end 7 .
- the holdown connector 8 is preferably formed with a plurality of bolt openings 23 in the back member 9 .
- the plurality of bolts 11 passes through the plurality of bolt openings 23 in the back member 9 of the holdown connector 8 and through the plurality of bolt openings 22 in the column 6 .
- the bolt openings 22 in the column 6 are preferably slotted openings 22 , each with a horizontal diameter 33 and a vertical diameter 24 , the horizontal diameter 33 being greater than the vertical diameter 24 . This would allow for horizontal adjustment of the holdown connector 8 relative the column 6 and the anchor 4 .
- the horizontal diameter 33 is 1.25 inches and the vertical diameter 24 is 0.8125 inches.
- the bolt openings 23 in the back member 9 of the holdown connector 8 are round, so that there is as little play as possible between the bolts 11 and the bolt openings 23 .
- the back member 9 of the holdown connector 8 is preferably formed with a plurality of screw openings 25 .
- the plurality of screws 12 passes through the plurality of screw openings 25 in the back member 9 of the holdown connector 8 and into the web member 16 of the column 6 .
- holes could be drilled through either the holdown connector 8 , the column 6 , or both at the time of installation, either with a drill bit or with self-drilling screws 12 .
- the screws 12 of the plurality of screws 12 are preferably self-drilling screws 12 , whether or not holes are prepared in the holdown connector 8 and the column 6 .
- the screws 12 of the plurality of screws 12 are also self-tapping screws 12 .
- the screws 12 are #14 self-drilling screws.
- the bottom end 7 of the column 6 preferably rests on a substantially horizontal bottom plate 26
- the bottom plate 26 rests on the underlying structural member 3
- the bottom plate 26 is a channel 26 having two side members 27 and a bottom member 28 , the two side members 27 embracing the bottom end 7 of the column 6 .
- the column 6 could rest directly on the underlying structural member 3 , with or without a discontinuous bottom plate 26 to either side of the column 6 .
- the back member 9 of the holdown connector 8 is substantially planar and substantially vertical.
- the seat member 10 of the holdown connector 8 preferably is substantially planar and substantially horizontal.
- the back member 9 and the seat member 10 preferably are integrally joined, either by being bent out of the same sheet material or cast in the same mould, or by being welded together.
- the back member 9 and seat member 10 could be mechanically interlocked, either directly with each other or through other intervening parts of the holdown connector 8 .
- the back member 9 and the seat member 10 are joined by a first side member 29 substantially orthogonal to both the back member 9 and the seat member 10 . More preferably, the back member 9 and the seat member 10 are joined by a second side member 30 , the second side member 30 being substantially orthogonal to both the back member 9 and the seat member 10 .
- the first side member 29 and the second side member 30 preferably are substantially planar.
- the back member 9 and the seat member 10 are generally rectangular while the first side member 29 and the second side member 30 are substantially triangular.
- the back member 9 of the holdown connector 8 preferably fits entirely between the first side member 19 and the second side member 20 of the column 6 . If the column 6 is, or has, a channel 21 , it is advantageous to nest the holdown connector 8 within the channel 21 in order to come as close as possible to horizontally centering the holdown connector 8 to come as close as possible to perfectly concentric loading.
- the column 6 is a wall stud 6 .
- the column is sufficiently narrow to fit within the space of a standard light frame wall, which is framed with nominal 2 ⁇ 4 wood studs when wood is the primary construction material.
- the bolt openings 22 in the web member 16 of the column 6 preferably are substantially vertically aligned. Most preferably, four bolt openings 22 in the web member 16 of the column 6 are used for the present invention. Most preferably, the lowest of these bolt openings is 6.25 inches from the bottom end 7 of the column 6 and the bolt openings 22 are 2.75 inches apart on center.
- the plurality of screws 12 are horizontally spaced to either side of the bolt openings 22 in the web member 16 of the column 6 , in order to resist deflection and rotation.
- the column 6 is preferably formed from steel, although any other material of sufficient strength and other requisite attributes could be used.
- the holdown connector 8 is formed at least in part by cutting sheet steel. Cold forming connectors from sheet steel is common because of steel's malleability.
- the steel is preferably galvanized, but it can also be stainless, a more expensive alternative.
- the holdown connector 8 could be formed at least in part by casting metal. The most common metal for cast connectors is aluminum, because of its combination of light weight, resistance to corrosion, cost and the ease with which it is cast.
- the holdown connector 8 is formed with planar metal members 31 and the column 6 is formed with planar metal members 32 and the planar metal members 32 of the column 6 are thicker than the planar metal members 31 of the holdown connector 8 .
- the present invention is discussed as a holdown connection 1 basically comprising an underlying structural member 3 , an anchor 4 , a substantially vertical metal column 6 , and a holdown connector 8
- the holdown connector 8 of the present invention could be oriented horizontally on a beam analogous to the metal column 6 , anchored either to an adjacent structural member such as a wall or beam analogous to the underlying structural member 3 .
- the connection 1 would be essentially the same, simply turned 90 degrees onto its side.
- the anchor 4 could be restrained through attachment to a second horizontally-oriented holdown connector 8 , as in a vertical floor-to-floor tie connection.
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
A connection between a metal column, in particular a vertical I-beam, and an underlying structural member, in particular a ferroconcrete foundation, using a connector that is fastened to the metal column using both bolts and screws.
Description
- This invention relates to a connector for anchoring a first building structural member to a second building structural member. The connector works in conjunction with a separate anchor member that is received by or is attached to the second building structural member and fastener means for attaching the connector to the first building structural member.
- Earthquakes, hurricanes, tornadoes, and floods impose forces on a building that can cause structural failure. To counteract these forces, it has become common practice to strengthen or add ties between the structural members of a building in areas where such cataclysmic forces are typically focused. For example, framed walls can be attached to the foundation instead of merely resting on it. The connections between the framed walls of each floor can be strengthened. And joists can be connected to both their headers and the support member for their header. One of the most common connectors designed for strengthening structural connections in called a holdown by the inventor. Holdowns are commonly used to anchor framed walls to the foundation.
- Early holdowns where constructed from two or more separate pieces of metal, and the pieces were welded together. These holdowns had to be painted to resist rusting because welding destroys the zinc coating of galvanized sheet metal. They were heavy and costly to produce because of the additional manufacturing steps and manual labor involved in welding and painting operations.
- State of the art holdowns are made from galvanized sheet metal formed on progressive die machines and require no welding or painting. These advancements have reduced the cost of making holdowns while increasing their ability to withstand tension forces. However, ongoing research and development have demonstrated that it is possible to produce holdowns that are more inexpensive to produce and stronger for many connections.
- Most of the holdown connectors of the prior art that work in conjunction with a separate anchor member work in a similar fashion. The anchor member, which is attached to the second structural member, attaches at the seat of the connector. This seat is connected to a back member. The back member attaches to the first building structural member, generally a stud in a framed wall. Most holdown connectors have one or more side members to increase the strength of the connector or to connect the seat member to the back member.
- Most prior art holdown connectors that attached to a separate anchor member share a common characteristic: they attach to the vertical structural member with one type of fastener, either bolts or screws. If only screws are used, a large number must be distributed over a correspondingly large part of the connector because screws have relatively low bearing strength. The part of the connector devoted to accepting fasteners must, therefore, be either relatively broad, long, or some compromise between the two. Such a connector cannot fit in a very restricted space.
- The holdown connector of the present invention is specifically designed to fit within a restricted space. In order to do so, it uses a plurality of bolts in order to achieve relatively high load resistance. However, in the preferred embodiment, testing has revealed that the bolts alone would be insufficient to adequately resist rotation and deflection and a connection made with bolts alone would therefore be inadequate.
- Because rotation and deflection forces are less substantial that tension forces, and because space in the preferred embodiment is limited, the bolts are augmented with screws that resist rotation and deflection in a novel combination.
- There is still a continuing need in the art for a connector that can be made more inexpensively, installed more easily, and with better withstands forces imposed by cataclysmic events.
- An object of the present invention is to provide a connection between a metal column and an underlying structural member. This object is achieved by providing a connector that is fastened to the metal column in a unique manner, using both bolts and screws.
- An object of the present invention is to provide a connection between an I-beam and an underlying structural member. This object is achieved by providing a connector that attaches to the web of the I-beam.
- An object of the present invention is to provide a connection between an I-beam and an underlying structural member that does not interfere with adjacent structural members. This object is achieved by providing a connector that fits between the side members of the I-beam.
- An object of the present invention is to provide a connection between an I-beam and an underlying structural member that resists rotation and deflection. This object is achieved by providing a connector that attaches to the web of the I-beam with bolts and screws spaced to either side of the bolts.
- An object of the present invention is to provide a connection between a metal column and an underlying structural member that is both quick and easy to make. This object is achieved in part by using self-drilling screws.
- An object of the present invention is to provide a connection between a metal column and an underlying structural member that is inexpensive. This object is achieved in part by providing a connector that can be made from sheet steel.
- An object of the present invention is to provide a connection between a metal column and an underlying structural member that resists fire, corrosion and infestation. These objects are achieved by providing a connection that can be made entirely out of metal and concrete. These and other objects of the present invention will become apparent with reference to the drawings, the description of the preferred embodiment and the claims.
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FIG. 1 is a perspective view of a connection formed in accordance with the present invention. -
FIG. 2 is a top plan view of the connector of the present invention. -
FIG. 3 is a front elevation view of the connector of the present invention. -
FIG. 4 bottom plan view of the connector of the present invention. -
FIG. 5 is a back elevation view of the connector of the present invention. -
FIG. 6 is a left side elevation view of the connector of the present invention. -
FIG. 7 is a right side elevation view of the connector of the present invention. -
FIG. 8 is a cross-section view of a connection formed in accordance with the present invention. -
FIG. 9 is a cross-section view of the column and connector of the present invention. - As best shown in
FIGS. 1 and 8 , the present invention is acolumn holdown connection 1 in abuilding 2. Theconnection 1 comprises, basically, an underlyingstructural member 3, ananchor 4, a substantiallyvertical metal column 6, and aholdown connector 8. Theanchor 4 is restrained by the underlyingstructural member 3. Theanchor 4 has anattachment end 5 protruding above the underlyingstructural member 3. The substantiallyvertical metal column 6 has abottom end 7 supported by the underlyingstructural member 3. Theholdown connector 8 has aback member 9 and aseat member 10. Theback member 9 is fastened to thecolumn 6 with a plurality ofbolts 11 and a plurality ofscrews 12. Theseat member 10 is restrained by theattachment end 5 of theanchor 4. - As best shown in
FIGS. 1 and 8 , preferably the underlyingstructural member 3 is afoundation 3. More preferably, the thefoundation 3 is cementitous. In the most preferred embodiment, thefoundation 3 is concrete reinforced with steel rebar. Alternatively, the underlyingstructural member 3 could be thefloor 3 of an upper storey. In such a case, theanchor 4 could be restrained through asecond holdown connector 8, an arrangement common in floor-to-floor connections. - As best shown in
FIGS. 1 and 8 , theanchor 4 is preferably ananchor bolt 4, specifically a ⅞ inch anchor bolt. Most preferably, the anchor is abent steel bolt 3 embedded in aferroconcrete foundation 3. - As best shown in
FIGS. 2 and 4 , preferably theseat member 10 of theholdown connector 8 is formed with ananchor opening 13 through which theattachment end 5 of theanchor 4 passes. Theattachment end 5 of theanchor 4 preferably hashelical threads 14 and anut 15 is threaded onto thehelical threads 14, thereby restraining theattachment end 5 against theseat member 10. Alternatively, theattachment end 5 of theanchor 4 could be welded to theholdown connector 8 or otherwise fixed. - As best shown in
FIGS. 1 and 8 , thecolumn 6 is preferably an I-beam 6 with a central, substantiallyplanar web member 16 having afirst side 17 and asecond side 18, a first substantiallyplanar side member 19 and a second substantiallyplanar side member 20. Preferably, thefirst side member 19 and thesecond side member 20 are generally perpendicular to theweb member 16 and extend beyond both thefirst side 17 and thesecond side 18 of theweb member 16 to create a pair of back-to-back channels 21. Alternatively, thecolumn 6 could be a hollow,tubular column 6 or even a thick,solid block 6. - As best shown in
FIG. 8 , preferably thecolumn 6 is formed with a plurality ofbolt openings 22 in theweb member 16 adjacent thebottom end 7. Theholdown connector 8 is preferably formed with a plurality ofbolt openings 23 in theback member 9. And, preferably, the plurality ofbolts 11 passes through the plurality ofbolt openings 23 in theback member 9 of theholdown connector 8 and through the plurality ofbolt openings 22 in thecolumn 6. - As best shown in
FIGS. 8 and 9 , thebolt openings 22 in thecolumn 6 are preferably slottedopenings 22, each with ahorizontal diameter 33 and avertical diameter 24, thehorizontal diameter 33 being greater than thevertical diameter 24. This would allow for horizontal adjustment of theholdown connector 8 relative thecolumn 6 and theanchor 4. Most preferably, thehorizontal diameter 33 is 1.25 inches and thevertical diameter 24 is 0.8125 inches. - As best shown in
FIGS. 3 and 5 , preferably thebolt openings 23 in theback member 9 of theholdown connector 8 are round, so that there is as little play as possible between thebolts 11 and thebolt openings 23. - As best shown in
FIGS. 3 and 5 , theback member 9 of theholdown connector 8 is preferably formed with a plurality ofscrew openings 25. Preferably, the plurality ofscrews 12 passes through the plurality ofscrew openings 25 in theback member 9 of theholdown connector 8 and into theweb member 16 of thecolumn 6. Alternatively, holes could be drilled through either theholdown connector 8, thecolumn 6, or both at the time of installation, either with a drill bit or with self-drilling screws 12. Thescrews 12 of the plurality ofscrews 12 are preferably self-drillingscrews 12, whether or not holes are prepared in theholdown connector 8 and thecolumn 6. Preferably, thescrews 12 of the plurality ofscrews 12 are also self-tappingscrews 12. Most preferably, thescrews 12 are #14 self-drilling screws. - As best shown in
FIGS. 1 and 8 , thebottom end 7 of thecolumn 6 preferably rests on a substantiallyhorizontal bottom plate 26, and thebottom plate 26 rests on the underlyingstructural member 3. Preferably, thebottom plate 26 is achannel 26 having twoside members 27 and abottom member 28, the twoside members 27 embracing thebottom end 7 of thecolumn 6. Alterntively, thecolumn 6 could rest directly on the underlyingstructural member 3, with or without adiscontinuous bottom plate 26 to either side of thecolumn 6. - As shown in all the drawing figures, preferably,\ the
back member 9 of theholdown connector 8 is substantially planar and substantially vertical. Theseat member 10 of theholdown connector 8 preferably is substantially planar and substantially horizontal. These are essentially the simplest forms for theback member 9 andseat member 10 and therefore the easiest and most economical to manufacture and install. - As best shown in
FIGS. 1 , 2, 3 and 4, theback member 9 and theseat member 10 preferably are integrally joined, either by being bent out of the same sheet material or cast in the same mould, or by being welded together. Alternatively, theback member 9 andseat member 10 could be mechanically interlocked, either directly with each other or through other intervening parts of theholdown connector 8. - As best shown in
FIG. 1 , preferably theback member 9 and theseat member 10 are joined by afirst side member 29 substantially orthogonal to both theback member 9 and theseat member 10. More preferably, theback member 9 and theseat member 10 are joined by asecond side member 30, thesecond side member 30 being substantially orthogonal to both theback member 9 and theseat member 10. Thefirst side member 29 and thesecond side member 30 preferably are substantially planar. Preferably, theback member 9 and theseat member 10 are generally rectangular while thefirst side member 29 and thesecond side member 30 are substantially triangular. - As best shown in
FIG. 1 , theback member 9 of theholdown connector 8 preferably fits entirely between thefirst side member 19 and thesecond side member 20 of thecolumn 6. If thecolumn 6 is, or has, achannel 21, it is advantageous to nest theholdown connector 8 within thechannel 21 in order to come as close as possible to horizontally centering theholdown connector 8 to come as close as possible to perfectly concentric loading. - As best shown in
FIG. 1 , preferably thecolumn 6 is awall stud 6. In the most preferred form of the invention, the column is sufficiently narrow to fit within the space of a standard light frame wall, which is framed with nominal 2×4 wood studs when wood is the primary construction material. - As best shown in
FIGS. 1 and 8 , thebolt openings 22 in theweb member 16 of thecolumn 6 preferably are substantially vertically aligned. Most preferably, fourbolt openings 22 in theweb member 16 of thecolumn 6 are used for the present invention. Most preferably, the lowest of these bolt openings is 6.25 inches from thebottom end 7 of thecolumn 6 and thebolt openings 22 are 2.75 inches apart on center. - As best shown in
FIGS. 1 , 3 and 5, preferably the plurality ofscrews 12 are horizontally spaced to either side of thebolt openings 22 in theweb member 16 of thecolumn 6, in order to resist deflection and rotation. - The
column 6 is preferably formed from steel, although any other material of sufficient strength and other requisite attributes could be used. Preferably, theholdown connector 8 is formed at least in part by cutting sheet steel. Cold forming connectors from sheet steel is common because of steel's malleability. The steel is preferably galvanized, but it can also be stainless, a more expensive alternative. Theholdown connector 8 could be formed at least in part by casting metal. The most common metal for cast connectors is aluminum, because of its combination of light weight, resistance to corrosion, cost and the ease with which it is cast. - As best shown in
FIG. 9 , preferably theholdown connector 8 is formed withplanar metal members 31 and thecolumn 6 is formed withplanar metal members 32 and theplanar metal members 32 of thecolumn 6 are thicker than theplanar metal members 31 of theholdown connector 8. - Although the present invention is discussed as a
holdown connection 1 basically comprising an underlyingstructural member 3, ananchor 4, a substantiallyvertical metal column 6, and aholdown connector 8, theholdown connector 8 of the present invention, like many priorart holdown connectors 8, could be oriented horizontally on a beam analogous to themetal column 6, anchored either to an adjacent structural member such as a wall or beam analogous to the underlyingstructural member 3. Theconnection 1 would be essentially the same, simply turned 90 degrees onto its side. Theanchor 4 could be restrained through attachment to a second horizontally-orientedholdown connector 8, as in a vertical floor-to-floor tie connection.
Claims (29)
1. A column holdown connection (1) in a building (2), said connection (1) comprising:
a. an underlying structural member (3);
b. an anchor (4) restrained by said underlying structural member (3), said anchor (4) having an attachment end (5) protruding above said underlying structural member (3);
c. a substantially vertical metal column (6) with a bottom end (7) supported by said underlying structural member (3);
d. a holdown connector (8) having a back member (9) and a seat member (10), said back member (9) being fastened to said column (6) with a plurality of bolts (11) and a plurality of screws (12), and said seat member (10) being restrained by said attachment end (5) of said anchor (4).
2. The connection (1) of claim 1 wherein:
a. said underlying structural member (3) is a foundation (3).
3. The connection (1) of claim 2 wherein:
a. said foundation (3) is cementitous.
4. The connection (1) of claim 1 wherein:
a. said anchor (4) is an anchor bolt (4).
5. The connection (1) of claim 4 wherein:
a. said seat member (10) of said holdown connector (8) is formed with an anchor opening (13) through which said attachment end (5) of said anchor (4) passes; and
b. said attachment end (5) of said anchor (4) has helical threads (14) and a nut (15) is threaded onto said helical threads (14), thereby restraining said attachment end (5) against said seat member (10).
6. The connection (1) of claim 1 wherein:
a. said column (6) is an I-beam (6) with a central, substantially planar web member (16) having a first side (17) and a second side (18), a first substantially planar side member (19) and a second substantially planar side member (20), said first side member (19) and said second side member (20) being generally perpendicular to said web member (16) and extending beyond both said first side (17) and said second side (18) of said web member (16) to create a pair of back-to-back channels (21).
7. The connection (1) of claim 6 wherein:
a. said column (6) is formed with a plurality of bolt openings (22) in said web member (16) adjacent said bottom end (7);
b. said holdown connector (8) is formed with a plurality of bolt openings (23) in said back member (9); and
c. said plurality of bolts (11) passes through said plurality of bolt openings (23) in said back member (9) of said holdown connector (8) and through said plurality of bolt openings (22) in said column (6).
8. The connection (1) of claim 7 wherein:
a. said bolt openings (22) in said column (6) each have a horizontal diameter (33) and a vertical diameter (24).
9. The connection (1) of claim 8 wherein:
a. said bolt openings (23) in said back member (9) of said holdown connector (8) are round.
10. The connection (1) of claim 7 wherein:
a. said back member (9) of said holdown connector (8) is formed with a plurality of screw openings (25); and
b. said plurality of screws (12) passes through said plurality of screw openings (25) in said back member (9) of said holdown connector (8) and into said web member (16) of said column (6).
11. The connection (1) of claim 10 wherein:
a. said screws (12) of said plurality of screws (12) are self-drilling screws (12).
12. The connection (1) of claim 11 wherein:
a. said screws (12) of said plurality of screws (12) are self-tapping screws (12).
13. The connection (1) of claim 1 wherein:
a. said bottom end (7) rests on a substantially horizontal bottom plate (26), and said bottom plate (26) rests on said underlying structural member (3).
14. The connection (1) of claim 13 wherein:
a. said bottom plate (26) is a channel (26) having two side members (27) and a bottom member (28), said two side members (27) embracing said bottom end (7) of said column (6).
15. The connection (1) of claim 1 wherein:
a. said back member (9) of said holdown connector (8) is substantially planar. and substantially vertical;
b. said seat member (10) of said holdown connector (8) is substantially planar and substantially horizontal.
16. The connection (1) of claim 15 wherein:
a. said back member (9) and said seat member (10) are integrally joined.
17. The connection (1) of claim 16 wherein:
a. said back member (9) and said seat member (10) are joined by a first side member (29) substantially orthogonal to both said back member (9) and said seat member (10).
18. The connection (1) of.claim 17 wherein:
a. said back member (9) and said seat member (10) are joined by a second side member (30), said second side member (30) being substantially orthogonal to both said back member (9) and said seat member (10).
19. The connection (1) of claim 18 wherein:
a. said first side member (29) and said second side member (30) are substantially planar.
20. The connection (1) of claim 19 wherein:
a. said back member (9) and said seat member (10) are generally rectangular.
21. The connection (1) of claim 21 wherein:
a. said first side member (29) and said second side member (30) are substantially triangular.
22. The connection (1) of claim 6 wherein:
a. said back member (9) of said holdown connector (8) fits entirely between said first side member (19) and said second side member (20) of said column (6).
23. The connection (1) of claim 1 wherein:
a. said column (6) is a wall stud (6).
24. The connection (1) of claim 7 wherein:
a. said bolt openings (22) in said web member (16) of said column (6) are substantially vertically aligned.
25. The connection (1) of claim 24 wherein:
a. said plurality of screws (12) are horizontally spaced to either side of said bolt openings (22) in said web member (16) of said column (6), in order to resist deflection and rotation.
26. The connection (1) of claim 1 wherein:
a. said column (6) is formed from steel.
27. The connection (1) of claim 1 wherein:
a. said holdown connector (8) is formed at least in part by cutting sheet steel.
28. The connection (1) of claim 1 wherein:
a. said holdown connector (8) is formed at least in part by casting metal.
29. The connection (1) of claim 1 wherein:
a. said holdown connector (8) is formed with planar metal members (31) and said column (6) is formed with planar metal members (32) and said planar metal members (32) of said column (6) are thicker than said planar metal members (31) of said holdown connector (8).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/394,606 US20070245677A1 (en) | 2006-03-31 | 2006-03-31 | Column holdown connection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/394,606 US20070245677A1 (en) | 2006-03-31 | 2006-03-31 | Column holdown connection |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070245677A1 true US20070245677A1 (en) | 2007-10-25 |
Family
ID=38618120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/394,606 Abandoned US20070245677A1 (en) | 2006-03-31 | 2006-03-31 | Column holdown connection |
Country Status (1)
Country | Link |
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US (1) | US20070245677A1 (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
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US20060213136A1 (en) * | 2005-03-25 | 2006-09-28 | Jin-Jie Lin | Holdown with reinforced back |
US20070107338A1 (en) * | 2005-10-27 | 2007-05-17 | Dietrich Industries, Inc. | Hold-down connector |
US20070113516A1 (en) * | 2005-10-27 | 2007-05-24 | Dietrich Industries, Inc. | Hold-down connectors and wall systems |
US20070209312A1 (en) * | 2006-03-07 | 2007-09-13 | Aegis Metal Framing Llc | Truss hold-down connectors and methods for attaching truss to a bearing member |
US20070209311A1 (en) * | 2006-03-07 | 2007-09-13 | Aegis Metal Framing Llc | Truss hold-down connectors and methods for attaching a truss to a bearing member |
US20110272536A1 (en) * | 2008-12-24 | 2011-11-10 | Guy Valembois | Composite l-shaped fitting and method and mould for the production thereof |
JP2015045134A (en) * | 2013-08-27 | 2015-03-12 | 東日本旅客鉄道株式会社 | Column base reinforcement structure |
JP2016151138A (en) * | 2015-02-18 | 2016-08-22 | センクシア株式会社 | Structure and method for reinforcing existing column |
US10260227B2 (en) * | 2015-06-09 | 2019-04-16 | Rock West Composites, Inc. | Tubular framing system and method |
US10480177B2 (en) | 2016-11-18 | 2019-11-19 | Illinois Tool Works Inc. | Wall panel blocking bracket and method of using same |
US10538913B2 (en) * | 2018-05-23 | 2020-01-21 | Herman Miller, Inc. | Connection assembly for an architectural structure |
US10718111B2 (en) | 2017-03-13 | 2020-07-21 | Herman Miller, Inc. | Subarchitectural office system |
CN115889937A (en) * | 2023-03-09 | 2023-04-04 | 云南建投钢结构股份有限公司 | Welding construction method for steel structure beam, column and wall encircling combined node member |
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CN115889937A (en) * | 2023-03-09 | 2023-04-04 | 云南建投钢结构股份有限公司 | Welding construction method for steel structure beam, column and wall encircling combined node member |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SIMPSON STRONG-TIE COMPANY, INC., CALIFORNIA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NGUYEN, HIEN;LINN, ARTHUR R.;REEL/FRAME:018154/0306 Effective date: 20060726 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |