Static structures (e.g. – buildings) – Assembled in situ-type anchor or tie – Sheet or wire tie
Reexamination Certificate
2000-12-01
2002-09-24
Friedman, Carl D. (Department: 3635)
Static structures (e.g., buildings)
Assembled in situ-type anchor or tie
Sheet or wire tie
C052S713000, C052S285200, C052S293300, C052S295000
Reexamination Certificate
active
06453634
ABSTRACT:
This invention relates to a shear-resisting assembly, and a shear-resisting construction unit, in which a moment-resisting strap is attached to an elongated structural member subject to moment and shear forces. A typical use for the strap would be in a shear-resisting assembly such as a post attached to a foundation, or in a shear-resisting construction unit used in a building wall attached to a foundation, or it could simply be used for attachment of another structural wood member to a relatively immovable structure.
BACKGROUND OF THE INVENTION
A recent development in the building industry, particularly for framed homes of either wood or metal, or for light commercial or apartment buildings is the use of prefabricated shear-resisting construction units in walls for resisting lateral forces imposed on the building. An example of one such shear-resisting construction unit used in walls is described in U.S. patent application Ser. No. 08/975,940 filed Nov. 21, 1997. A commercial embodiment of a similar shear resisting construction unit used in walls is illustrated in a brochure published by Simpson Strong-Tie Company, Inc. entitled “Strong-Wall™ Shearwall” and having a designator F-SW16HD May 1999 exp. June 2000 and bearing a copyright notice dated 1999. These shear-resisting construction units used as prefabricated components for walls provided a major step forward in providing consistent lateral resistance in buildings in the light frame industry.
SUMMARY OF THE INVENTION
Applicant found, however that such shear-resisting construction units could be greatly strengthened at little increase in cost, weight, and installation time by installing a moment-resisting strap at a crucial location in the structure in combination with a holdown connector and joined by adhesive or fastener elements such as wood screws.
The strengthened construction unit results from a composite effect in which the moment-resisting strap acts in combination with other elements to give a far greater resistance to shear and moment forces than would have been possible had the elements acted alone instead of compositely together.
The theory of the operation of these elements is further described in the specification under the headings “Operation of the Moment-resisting Elongated Strap in the First Shear Resisting-assembly; “Operation of the First and Second Moment-resisting elongated straps in the Shear-resisting Construction Unit”, and “Composite Effect”.
A further enhancement effect occurs when the screws are used in sufficient number and in sufficiently close spacing to literally stitch substantially the entire back of the holdown to the moment-resisting strap and to a substantial portion of the wood structure so that a shear-resisting assembly of substantial length is stiffened and acts as a stiffened unit to transmit bending moments from the elongated wood structure to the foundation. Such a unit is extremely effective in reducing premature failure in the wood structural member due to bending. The moment resisting elongated strap extends to or slightly beyond the lower extremity of the holdown. The stitching effect of the multiple screws causes the holdown, a substantial portion of the moment resisting elongated strap, and a substantial portion of the elongated wood structure to act as a stiffened unit in resisting bending.
REFERENCES:
patent: 2947119 (1960-08-01), Puckett, Jr.
patent: 4744192 (1988-05-01), Commins
patent: 5150553 (1992-09-01), Commins et al.
patent: 5350265 (1994-09-01), Kinner
patent: 5467570 (1995-11-01), Leek
patent: 5595031 (1997-01-01), Commins
patent: 5622022 (1997-04-01), Haisch
patent: 5813182 (1998-09-01), Commins
patent: 5979130 (1999-11-01), Gregg et al.
patent: 6006487 (1999-12-01), Leek
patent: 6158184 (2000-12-01), Timmerman, Sr. et al.
patent: 6158188 (2000-12-01), Shahnazarian
patent: 6244004 (2001-06-01), Timmerman, Sr. et al.
patent: 6250041 (2001-06-01), Seccombe
patent: 0 918 114 (1999-05-01), None
patent: WO98/46839 (1998-10-01), None
ICBO Evaluation Report PFC-5402 Issued Jul. 1, 1998 For STS Prefabricated Lateral-Force Resisting (LFR) Panel System.
Ser. No. 60/043,835, filed on Apr. 4, 1997, “Lateral Force Resisting System,” invented by Timothy L. Timmerman.
Simpson Strong-Tie Company, Inc., “Strong-Wall Shearwall Garage Portal Systems and Installation Guide,” Simpson Strong-Tie Company, Inc. (U.S.A.), p. 5, (Nov. 15, 1999).
Bulldog Simpson GmbH, “Crampons Bulldog,” Bulldog Simpson GmbH, p. 2.
“Bolts, Lag Bolts, and Other Connectors: 13.14 Split Ring and Shear Plate Connectors,” McGraw-Hill, Inc. (U.S.A.), p. 3, (1993, 1988, 19880).
Alfred D. Commins and Robert C. Gregg, “Cyclic Performance of Tall-Narrow Shearwall Assemblies,” p. 12, (Apr. 5, 1994).
Bulldog Simpson GmbH, “Statische Berechnungen Simpson—HRB—Verbinder Teil 1—Zuganker und Schwellenanker,” Bulldog Simpson GmbH (Syke (Germany)), p. 2, (Nov. 15, 1998).
Cypher Charles R.
Cypher James R.
Friedman Carl D.
Glessner Brian E.
Simpson Strong-Tie Company Inc.
LandOfFree
Moment-resisting strap connection does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Moment-resisting strap connection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Moment-resisting strap connection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2888390