Page 36 of Wood Construction Connectors 2006 Catalog by Simpson Strong-Tie

37 Anchors HHDQ Heavy Duty Holdowns HDC Concentric Holdown Ga W Model No. H B C Anchor Dia. No. of SDS x2 Wood Screws Allowable Tension Loads DF/SP (133/160) Holdown Deflection at Highest Allowable Tension Design Load Code Ref. HHDQ11-SDS2.5 7 3 15 24 11445 0.076 HHDQ14-SDS2.5 7 3 18 30 14700 0.081 160 L 3 3 1 1 1 1 Allowable Tension Loads SPF/HF (133/160) 9615 12350 1. Allowable loads have been increased for earthquake or wind load durations with no further increase allowed; reduce where other load durations govern. 2. Loads are based on static tests on wood posts, limited by the lowest of 0.125" deflection, test ultimate divided by 3, or the SDS wood screw value. 3. HHDQs can be raised off the sill with no reduction in load or increase in deflection. HHDQ11 Vertical HHDQ11 Installation The heavy-duty HHDQ holdowns combine low deflection and high loads with ease of installation by using Simpsons patented SDS screws. FINISH: Gray paint. INSTALLATION: Use all specified fasteners. See General Notes. 1 centerline dimension for reduced eccentricity. Use in vertical or horizontal applications. Install Simpson SDS1/4x2 wood screws, which are supplied. (Lag screws will not achieve the same load.) The load transfer plate is an integral part of the HHDQ; no additional washer is required. CODES: See page 12 for Code Listing Key Chart. Check factory for availability. 4. SDS screws install best with a low speed drill with a hex head driver. 5. The Designer must specify anchor bolt type, length and embedment. 6. When using structural composite lumber columns, screws must be applied to the wide face of the column. 7. Post design shall be by Designer. 8. SDS x2 screws are required for HHDQs. See T-HDLA for HHDQ loads using shorter screws. Typical HDC Installation with 2-2x4 studs (Similar with 2-2x6 studs) Model No. Post Size W H B Anchor Bolt Number of SDS x2 Allowable Holdown Deflection at Highest Allowable Design Load Tension Loads SPF/HF (133) HDC5/22-SDS2.5 3 9 3 2-2x4 12 4215 HDC5/4-SDS2.5 3 9 3 4x4 12 4215 Concrete Bearing 7 @ 2500 psi Code Ref. 1 1 7460 9060 .032 .046 C L 45, 106, 126 Allowable Tension Loads DF/SP (133) 4870 4870 HDC10/22-SDS2.5 3 14 3 24 8425 HDC10/4-SDS2.5 3 14 3 2-2x4 4x4 1 1 24 8425 7460 9060 .050 .058 9665 9665 1. The Designer must specify anchor bolt type, length and embedment. See the SSTB Anchor Bolts (page 33-34). 2. See page 21 and 29 for retrofit anchor bolt. 3. Loads are based on static tests on wood studs, limited by the lowest of 0.125" deflection, test ultimate divided by 3, or the wood screw value. 4. Deflection at Highest Allowable Design Load: The deflection of a holdown measured between the anchor bolt and the strap portion of the holdown when loaded to the highest allowable load listed in the catalog table. This movement is strictly due to the holdown deformation under a static load test conducted on a wood jig. 5. SDS screws install best with a low speed drill with a hex head driver. 6. The HDCs will be limited by wood compression capacity if installed on a sill plate. HDC5/22 and HDC10/22 will achieve an allowable load of 4005 lb. on a DFL plate. HDC5/4 and HDC10/4 will achieve an allowable load of 4940 lb. on a DFL plate, which does not take deflection into account. Full tension values apply when installed on a sill, deflections may be higher. 7. Higher values may be obtained when HDC is not placed at an edge or with fc concrete strength 2500 psi. 8. When using structural composite lumber columns, screws must be applied to the wide face of the column. 9. Post design shall be by Designer. For holdowns, per ASTM test standards, anchor bolt nut should be finger-tight plus to turn with a hand wrench, with consideration given to possible future wood shrinkage. Care should be taken to not over-torque the nut. Impact wrenches should not be used. For holdowns, per ASTM test standards, anchor bolt nut should be finger-tight plus to turn with a hand wrench, with consideration given to possible future wood shrinkage. Care should be taken to not over-torque the nut. Impact wrenches should not be used. HDC10 US Patent 6,513,290 This product is preferable to similar connectors because of a) easier installation, b) higher loads, c) lower installed cost, or a combination of these features. HDC product line eliminates eccentricity. Installs with SDS screws (included) to reduce slip and provides a greater net section area of the post compared to bolts. MATERIAL: 10 gauge strap. FINISH: Galvanized strap, aluminum base. INSTALLATION: Use all specified fasteners. See General Notes. Install on concrete. Sized for 2-2x, 4x and 2-2x6 members. Center 2-2x6 posts on holdown. Concentric to eliminate bending on the stud. Install Simpsons SDS x2 wood screws, which are provided with the holdown. (Lag screws will not achieve the same load.) Slot in the seat allows for of adjustment perpendicular to plate. (Standard N series cut washer required, 1 diameter 0.134" thick.) Witness slot in the base to inspect the nut . Maximum anchor bolt height above concrete is 2 ". To tie double 2x members together, the Designer must determine the fasteners required to bind members to act as one unit without splitting the wood. Aluminum standoff cannot be in contact with pressure-treated wood. See Simpson Anchor Systems for tested, load-rated anchors and request T-ANCHORSPEC for more information. CODES: See page 12 for Code Listing Key Chart.

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