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DSSCB Bypass Framing Drift Strut Connector

DSSCB

Simpson Strong-Tie introduces the DSSCB for cold-formed steel construction. The DSSCB is used to anchor cold-formed steel bypass framing to the edge of a floor slab in order to accommodate horizontal building drift. The DSSCB simplifies panelized construction by allowing contractors to install finished panels from the top of the slab without the need to predrill or preinstall anchors for each clip. It also eliminates the coordination difficulties associated with preanchorage of standard bypass clips. With prepunched slots and round holes, the DSSCB is a dual-function connector that can be used for slide-clip and fixed-clip applications.

Key Features

  • Clips come in lengths of 3 1/2", 6" and 8".
  • Prepunched slots provide a full 1" of both upward and downward deflection.
  • Precision-manufactured shouldered screws, provided with DSSCB connectors, are designed to prevent overdriving and to ensure the clip functions properly.
  • Works with 13/16" and 1 5/8" strut channels as given in the accompanying figures. Common manufactured brands are Unistrut®, PHD and B-Line. Struts are not supplied by Simpson Strong-Tie.
  • The maximum slide-clip standoff distance is 3 1/16" for 13/16" struts, 3 7/8" for 1 5/8" struts and 2 1/4" for concrete inserts.
  • Depending on the application and the Designer’s specifications, struts can be either mechanically anchored, welded or cast in place.
  • Pre-engineered design solutions are provided for channel strut anchorage.
  • Tabulated design values are based on assembly testing to mitigate risk for designers, engineers and architects.
  • Optional precast concrete inserts for flush mounting.
  • Optional drift stopper, DSHS, for clip alignment flexibility (where drift not required).

Material

  • DSSCB — 97 mil (12 ga.), 50 ksi; DSHS — 97 mil (12 ga.), 33 ksi

Finish

  • Galvanized (G90)

Installation

  • Use the specified type and number of fasteners

Ordering Information

  • The DSSCB43.5-KT25, DSSCB46-KT25 and DSSCB48-KT25 contain 25 connectors and enough shouldered screws for installation. The DSHS-R100 contains 100 connectors.
  • Note: Replacement #14 shouldered screws for DSSCB connectors are the XLSH78B1414-RP83.

Codes

  • Testing performed in accordance with ICC-ES AC 261

Related Links

Related Literature

Load Tables

DSSCB Allowable Slide-Clip Connector Loads (lb.)
Model No. Stud Thickness mil (ga.) Fasteners to Stud Allowable Loads
Screw Pattern No. of #14 Shouldered Screws F1 F2 F3
DSSCB43.5 33 (20) A 2 105 515 615
DSSCB46 B 3 105 765 920
C, D 2 105 515 615
DSSCB48 E 4 105 765 1,225
F, G 3 105 765 920
DSSCB43.5 43 (18) A 2 155 785 940
DSSCB46 B 3 155 1,175 1,410
C, D 2 155 785 940
DSSCB48 E 4 155 1,175 1,880
F, G 3 155 1,175 1,410
DSSCB43.5 54 (16) A 2 225 1,160 1,345
DSSCB46 B 3 225 1,475 2,020
C, D 2 225 1,160 1,280
DSSCB48 E 4 225 1,475 2,445
F, G 3 225 1,475 1,965
DSSCB43.5 68 (14) and 97 (12) A 2 300 1,460 1,770
DSSCB46 B 3 300 1,475 2,675
C, D 2 300 1,460 1,685
DSSCB48 E 4 300 1,475 2,675
F, G 3 300 1,475 2,600
  1. For additional information, see General Notes for Allowable Connector Load Tables.
  2. DSSCB Allowable Slide-Clip Connector Loads are also limited by the Strut Channel Allowable Anchorage Load to Steel table or Concrete Insert Allowable Load Embedded to Concrete. Use the minimum tabulated values from the connector and anchorage load tables as applicable.
  3. See illustrations for shouldered screw fastener pattern placement to stud framing.
  4. Tabulated F1 loads are based on assembly tests with the load through the centerline of the stud. F1 loads require DSHS connector with (1) #10 screw to strut.
DSSCB Allowable Fixed-Clip Connector Loads (lb.)
Model No. Stud Thickness mil (ga.) Screw Pattern No. of #10 Screws Allowable Loads (lb.)
F1 F2 F3 F4
DSSCB43.5 33 (20) H 4 220 705 705 345
I, J 2 185 355 355 175
DSSCB46 K 6 220 1,060 1,060 355
L, M 4 185 705 705 350
DSSCB48 N 8 220 1,060 1,060 545
O, P 4 185 705 705 505
DSSCB43.5 43 (18) H 4 285 1,050 1,050 450
I, J 2 240 525 525 230
DSSCB46 K 6 285 1,125 1,580 460
L, M 4 240 1,050 1,050 455
DSSCB48 N 8 285 1,145 1,580 710
O, P 4 240 1,050 1,050 660
DSSCB43.5 54 (16) H 4 330 1,410 2,085 1,025
I, J 2 300 1,070 1,045 515
DSSCB46 K 6 360 1,410 3,130 1,050
L, M 4 300 1,410 2,135 1,040
DSSCB48 N 8 360 1,440 3,130 1,145
O, P 4 300 1,420 2,135 1,070
DSSCB43.5 68 (14) and 97 (12) H 4 395 1,410 2,160 1,025
I, J 2 300 1,080 1,080 515
DSSCB46 K 6 395 1,410 3,130 1,050
L, M 4 300 1,410 2,160 1,040
DSSCB48 N 8 395 1,440 3,240 1,145
O, P 4 300 1,420 2,160 1,070
  1. For additional information, see General Notes for Allowable Connector Load Tables.
  2. DSSCB Allowable Fixed-Clip Connector Loads are also limited by the Strut Channel Allowable Anchorage Load table. Use the minimum tabulated values from the connector and anchorage load tables as applicable.
  3. See illustrations for screw fastener pattern placement to stud framing.
  4. Tabulated F1 loads are based on assembly tests with the load through the centerline of the stud. F1 loads require DSHS connector with (1) #10 screw to strut.
Strut Channel Allowable Anchorage Loads to Steel (lb.)
Strut Size (in.) Models Welded Anchorage ea. Flange #12-24 Screw Anchorage
Weld Spacing (in.) Required Weld Length (in.) F1 (lb.) F2 (lb.) F3 (lb.) F4 (lb.) Screw Spacing (in.) F1 (lb.) F2 (lb.) F3 (lb.) F4 (lb.)
13/16 Unistrut®
P4520;
P4520HS;
P4520T;
P4520KO
PHD
1201; 1202;
1211; 1212;
1221; 1222;
1241; 1242
B-Line
B52;
B52H1 7/8;
B52SH;
B52KO6
4 1 1/2 775 1,430 2,540 870 4 755 1,235 2,540 870
6 1 1/2 775 955 2,540 870 6 755 845 2,540 840
8 1 775 715 2,540 740 8 755 715 2,540
10 1 775 570 2,540
12 1 775 475 2,540
16 1 775 360 2,540
1 5/8 Unistrut®
P1000;
P1000HS;
P1000T;
P1000KO
PHD
1001; 1002;
1011; 1012;
1021; 1022;
1041; 1042
B-Line
B22;
B22H1 7/8;
B22SH;
B22KO6
4 1 1/2 775 1,870 3,630 4 755 1,270 3,630
6 1 1/2 775 1,870 3,630 6 755 845 3,630
8 1 775 1,775 3,630 8 755 845 3,630
10 1 775 1,420 3,630
12 1 775 1,185 3,630
16 1 775 885 3,630
  1. For additional information, see General Information.
  2. Allowable anchorage loads are also limited by the DSSCB Connector Load tables. Use the minimum tabulated values from the connector and anchorage load tables as applicable.
  3. Allowable loads are based on 97 mil (12 ga.) thickness strut channel members with a minimum yield strength, Fy, of 33 ksi, tensile strength, Fu, of 45 ksi.
  4. Allowable loads for self-drilling screws are based on installation in minimum 3/16"-thick structural steel with Fy = 36 ksi. Values listed above may be used where other thicknesses of steel are encountered provided that the fastener has equal or better tested values into thicker steel. It is the responsibility of the Designer to select the proper length fasteners based on the steel thickness installation.
  5. For screw fastener installation into steel backed by concrete, predrilling of both the steel and the concrete is suggested. For predrilling, use a maximum 3/16"- diameter drill bit. Screw to be installed through steel portion of channel strut (1.5 x screw diameter from punch-out) and centered vertically in web.
  6. For any connector occuring within 2" of channel strut splice, load not to exceed — F2 = 865 lb. and F4 = 785 lb.
  7. Maximum allowable load of strut channel can be increased at high concentrated loads by welding each flange 1 1/2" from the strut channel to support directly at clip location:
    For 13/16" strut size — F1 = 775 lb., F2 = 1,430 lb., F3 = 2,540 lb. and F4 = 1,050 lb.
    For 1 5/8" strut size — F1 = 775 lb., F2 = 1,870 lb. and F3 = 3,630 lb.
  8. Required weld length is on each flange at spacing indicated.
  9. Anchorage spacing cannot be greater than framing spacing.
  10. Connector load to be located a minimum of 2" from end of strut channel.
Concrete Insert Allowable Load Embedded to Concrete (lb.)
Strut Size (in.) Concrete Insert Models for the DSSCB Embed Spacing (in.) F2 (lb.) F3 (lb.)
13/16 or 7/8 Unistrut® 3300 Series
B-Line B52I
PHD 4101, 4102
4 1,500 2,540
1 PHD 4201, 4202 4 2,000 2,540
1 3/8 Unistrut 3200 Series
B-Line B32I
PHD 4001, 4002
4 2,000 2,540
1 5/8 B-Line B22I
PHD 4301, 4302
4 2,000 2,540
  1. Minimum concrete compressive strength, f'c = 3,000 psi.
  2. Multiply tabulated values by a factor of 0.50 when clip is installed within 2" of the end of strut channel.
  3. Minimum connector load spacing is 12" o.c.
  4. Tabulated values are for concrete inserts with a 12" minimum length.
  5. Allowable anchorage loads are also limited by connector load table. Use the minimum tabulated value for the connector and the anchorage load tables as applicable.

General Notes for Allowable Connector Load Tables

  1. Allowable loads are for use when utilizing the traditional Allowable Stress Design methodology. Contact Simpson Strong-Tie for LRFD loads unless otherwise noted.
  2. Allowable loads are based on cold-formed steel members with a minimum yield strength, Fy, of 33 ksi and tensile strength, Fu, of 45 ksi for 43 mil (18 ga.) and thinner, and a minimum yield strength of 50 ksi and tensile strength of 65 ksi for 54 mil (16 ga.) and thicker.
  3. Allowable loads may not be increased for wind or seismic load.
  4. Allowable loads for #12 self-drilling screws are based on a minimum nominal shear strength, Pss, of 2,520 lb. and nominal tension strength, Pts, of 2,535 lb. and the allowable loads for #10 self-drilling screws are based on a minimum nominal shear strength, Pss, of 1,620 lb. and nominal tension strength, Pts, of 2,460 lb.
  5. It is the responsible of the Designer to select the proper length fasteners based on installation need. Screw length must ensure fastener extends through the connection a minimum of three exposed threads unless noted otherwise.
  6. Allowable loads for welded connections require E70XX electrodes with a minimum throat size equal to the clip thickness. Welding shall be in compliance with AWS D1.3. Welding galvanized steel may produce harm fumes; follow proper welding procedures and precautions.
  7. Clips do not replace lateral or stability bracing. Design of bracing is the responsibility of the Designer.
  8. It is the responsibility of the Designer to verify the adequacy of the stud. Allowable loads are based on clips installed an adequate distance away from penetrations, notches, ends of studs and other conditions that may affect the clip performance.
  9. It is the responsibility of the Designer to check the adequacy of the supporting structure for loads imposed by connectors.
  10. Industry studies show that hardened fasteners can experience performance problems in wet or corrosive environments. Accordingly, use these products in dry and non-corrosive environments only.
  11. For load combinations that include F1 and/or F2 and/or F3 and/or F4, use an appropriate interaction equation.
DSSCB Standoff Distances (in.)
Model. No Application Screw Pattern No. of Screws 13/16" Struts 1 5/8" Struts Concrete Inserts
Min Standoff (in.) Max Standoff (in.) Min Standoff (in.) Max Standoff (in.) Min Standoff (in.) Max Standoff (in.)
DSSCB43.5 Slide Clip A 2 1 2 5/16 1 13/16 3 1/8 3/16 1 1/2
DSSCB46 B 3 2 5/16 3 1/8 1 1/2
C 2 2 5/16 3 1/8 1 1/2
D 2 3 1/16 3 7/8 2 1/4
DSSCB48 E 4 2 5/16 3 1/8 1 1/2
F 3 2 5/16 3 1/8 1 1/2
G 3 3 1/16 3 7/8 2 1/4
DSSCB43.5 Fixed Clip H 4 1 2 11/16
I 2 2 11/16
J 2 3 7/16
DSSCB46 K 6 2 11/16
L 4 2 11/16
M 4 3 7/16
DSSCB48 N 8 2 11/16
O 4 2 11/16
P 4 3 7/16