Holdowns & Tension Ties
Holdowns
HB
B
CL
B
B
1. Allowable loads have been increased for wind or earthquake with no further increase allowed: reduce where other loads govern. 2. Post design by Specifier. Tabulated loads are based on 3 1⁄2" wide member minimum, unless noted otherwise. Post may consist of multiple members provided they are connected independently of the holdown fasteners. See pages 226-227 for common post allowable loads. 3. Structural composite lumber columns have sides that show either the wide face or the edges of the lumber strands/veneers. Values in the tables reflect installation into the wide face. See technical bulletin T-SCLCOLUMN for values on the narrow face (edge) (see page 232 for details). 4. HD and HDB holdowns are self-jigging and will ensure minumum bolt end distance, HB, when installed flush with the sill plate.
See foonote 4
Allowable Tension Loads (160) DF/SP 1895 2525 3130 3130 3750 4505 4935 6645 7310 7345 7740 9920 9920 10035 11350 12665 14220 11775 13335 15435 15510 16735 16775 19360 19070
SPF/HF 1610 2145 3050 3050 3190 3785 4195 5650 6215 6245 6580 8435 8430 8530 9215 10765 12085 9215 11055 13120 12690 14225 12690 15270 16210
Deflection at Highest Allowable Load 0.156 0.169 0.120 0.120 0.129 0.156 0.150 0.142 0.154 0.155 0.159 0.178 0.178 0.179 0.171 0.171 0.162 0.171 0.177 0.194 0.162 0.191 0.200 0.180 0.137
Code Ref.
Vertical HD19 Installation
Hanger not shown
Horizontal HDB Installation (Plan View) IP3, F28, L21
Minimum wood member thickness Washers must be installed between bolt nuts and wood
HD3B Vertical Installation
5. Deflection at Highest Allowable Tension Load includes fastener slip holdown deformation, and anchor bolt elongation for holdowns installed up to 6" above top of concrete. Holdowns may be installed raised up to 18" above top of concrete with no load reduction provided that additional elongation of the anchor rod is accounted for. 6. To achieve published loads, machine bolts shall be installed with the nut on the opposite side of the holdown. If reversed, the Designer shall reduce the allowable loads shown per NDS requirements when bolt threads are in the shear plane. 7. Lag bolts will not develop the listed loads. 8. Tabulated values may be doubled when the HD holdown is installed on opposite sides of the wood member. The Designer must evaluate the capacity of the wood member and the anchorage. 9. Standard cut washer is required under anchor nut for HD12 with 1" anchor and HD19 with 1 1 ⁄8" anchors.
C-2013 © 2013 SIMPSON STRONG-TIE COMPANY INC. PRINTED 12/12
Minimum Material Dimensions (in) Fasteners Model Wood Anchor Stud Member No. Base Body HB 4 SB W H B CL SO (in) Ga Dia. Bolts Thickness2 1 1⁄2 2 1⁄2 3 5 3 1 1 5 1 5 5 HD3B — 12 4 ⁄4 2 ⁄2 2 ⁄2 8 ⁄8 2 ⁄4 1 ⁄16 ⁄8 ⁄8 2 - ⁄8 3 3 1⁄2 2 1⁄2 5 HD5B 3⁄16 10 5 1⁄4 3 2 1⁄2 9 3⁄8 2 1⁄2 1 1⁄4 2 ⁄8 2 - 3⁄4 3 3 1⁄2 3 7 3 1⁄2 HD7B 3⁄16 10 5 1⁄4 3 2 1⁄2 12 3⁄8 2 1⁄2 1 1⁄4 2 ⁄8 3 - 3⁄4 4 1⁄2 3 1⁄2 4 1⁄2 7 3 1 1 7 1 1 3 7 HD9B ⁄8 7 6 ⁄8 3 ⁄2 2 ⁄8 14 2 ⁄2 1 ⁄4 2 ⁄8 ⁄8 3 - ⁄8 5 1⁄2 7 1⁄4 3 1⁄2 1 4-1 4 1⁄2 5 1⁄2 x5 1⁄2 HD129 3⁄8 3 1⁄2 3 7 4 3 1⁄2 20 5⁄16 4 1⁄4 2 1⁄8 3 5⁄8 1 ⁄2 4 1 1⁄8 4-1 7 1⁄4 5 1⁄2 x5 1⁄2 7 1⁄4 1 1⁄8 5-1 1 5 ⁄2 x5 1⁄2 HD199 3⁄8 3 7 4 3 1⁄2 24 1⁄2 4 1⁄4 2 1⁄8 3 5⁄8 7 1⁄4 1 1⁄4 5-1 1 5 ⁄2 x5 1⁄2
W
HD3B
minimum end distance to end of post from post bolt
These products are available with additional corrosion protection. Additional products on this page may also be available with this option, check with Simpson Strong-Tie for details.
50
H
CL
Simpson Strong-Tie offers a wide variety of bolted holdowns offering lowdeflection performance for a range of load requirements. All of these holdowns have been tested in accordance with ICC-ES’s AC 155 acceptance criteria and are approved for use in vertical and horizontal applications. The HD3B is a light-duty holdown designed for use in shearwalls and SB braced-wall panels, as well as other lateral applications. SB The HD5B, HD7B and HD9B bolted holdowns incorporate the proven design B S of our HDQ8 SDS-style holdown and feature a unique seat design which greatly H H minimizes deflection under load. HDB holdowns are self jigging, ensuring that the code-required minimum of seven bolt diameters from the end of the post is met. They can be installed directly on the sill plate or raised above it and are suitable HB for back-to-back applications where eccentricity is a concern. HDBs are designed to provide loads for intermediate-load-range shearwalls, braced-wall panels and lateral applications. HB HD holdowns offer the highest allowable loads, providing high capacity for SO both vertical and horizontal applications. The HD12 and HD19 are self jigging, ensuring that the code-required minimum of seven bolt diameters from the end of the post is met. They can be installed back-to-back when eccentricity is an issue. W SO MATERIAL: See table W HD5B FINISH: HD3B/HD5B/HD7B/HD9B – Galvanized; Minimum HD – Simpson Strong-Tie® gray paint (HD7B and wood HD19 HD9B similar) INSTALLATION: • Use all specified fasteners. See General Notes. member (HD12 thickness 1 1 U.S. Patents • Bolt holes shall be a minimum of ⁄32" to a maximum of ⁄16" similar) 6,006,487; 6,327,831 larger than the bolt diameter (per NDS, section 11.1.2). Washers must be installed • Stud bolts should be snugly tightened with standard cut between bolt washers between the wood and nut (BP’s are required in nuts and wood the City and County of Los Angeles). For holdowns, per ASTM test standards, • The Designer must specify anchor bolt type, length, and anchor bolt nut should be finger-tight plus 1⁄3 to 1 embedment. See SB and SSTB Anchor bolts (pages 33-37). ⁄2 turn with a hand wrench, with consideration • To tie multiple 2x members together, the Designer must given to possible future wood shrinkage. determine the fasteners required to join members without Care should be taken to not over-torque the nut. splitting the wood. Impact wrenches should not be used. CODES: See page 13 for Code Reference Key Chart. Stand off provides CL
Holdowns & Tension Ties
HDB/HD