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DSSCB Bypass Framing Drift Strut Connector

DSSCB

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Deflection Connectors

This product's information may differ depending on the category of use. You are currently viewing details related to Deflection Connectors. You can also view product information related to the category: Drift Connectors for Cold-Formed Steel Construction

The solution to accommodate building drift, the DSSCB, is used to support cold-formed steel bypass framing to the edge of a floor slab. The DSSCB also simplifies installation by allowing installers for panelized construction to install finished panels while working off the top of the slab without the need to predrill or preinstall anchors for each clip. It also eliminates the coordination difficulties associated with pre-anchorage 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

  • The 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.

Related Literature

Connectors for Cold-Formed Steel Construction Catalog
C-CF-2020
A catalog for Connectors for Cold-Formed Steel Construction products and solutions.
Catalog
DSSCB and SCS Tested Capacities into CLT with Simpson Strong-Tie® Strong-Drive® Screws
L-CF-BYPASSCLT21
Tested capacities of the DSSCB bypass framing drift strut connector and the SCS seismic bypass framing connector when fastened into cross-laminated timber (CLT) using Strong-Drive® screws.
Engineering Letter
DSSCB Bypass Framing Drift Strut Connector Nominal, LRFD, and ASD Loads
L-CF-DSSCB22
This letter details LRFD and nominal limit state performance values for the DSSCB bypass framing drift strut connector.
Engineering Letter
DSSCB Capacities of Concrete Inserts Embedded into Concrete at Minimum Edge Distances
L-CF-DSSCBCON21
The DSSCB bypass framing drift strut connector has been evaluated for use with concrete inserts with smaller edge distances than those currently published in the C-CF-2020 catalog.
Engineering Letter

Load Tables

DSSCB Allowable Slide-Clip Connector Loads

DSSCB Allowable Slide-Clip Connector Loads
  1. For additional information, see Innovative Solutions for Curtain-Wall Framing.
  2. DSSCB Allowable Slide-Clip Connector Loads are also limited by the Strut Channel Allowable Anchorage Load to Steel table below or Concrete Insert Allowable Load Embedded to Concrete below. Use the minimum tabulated values from the connector and anchorage load tables as applicable.
  3. See illustrations in the image gallery 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

DSSCB Allowable Fixed-Clip Connector Loads
  1. For additional information, see Innovative Solutions for Curtain-Wall Framing.
  2. DSSCB Allowable Fixed-Clip Connector Loads are also limited by the Strut Channel Allowable Anchorage Load table below. Use the minimum tabulated values from the connector and anchorage load tables as applicable.
  3. See illustrations in the image gallery 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.
  5. In-plane capacities (F1) for DSSCB attached to 54 mil (16 ga.) stud can be increased to 500 lb. with the addition of a shoulder screw at first slot from bend line for screw pattern K and L and at middle slot for pattern M (reference patterns shown to the right).

Strut Channel Allowable Anchorage Loads to Steel

Strut Channel Allowable Anchorage Loads to Steel
  1. For additional information, see Innovative Solutions for Curtain-Wall Framing.
  2. Allowable anchorage loads are also limited by the DSSCB Connector Load tables above. 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. Tabulated values for Unistrut P4520, 1 5/8" x 13/16" channel may be used for Unistrut channel 1 5/8" x 7/8" models P3300, P33HS and P3300T.
  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. 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.
  11. Simple-span allowable load values are applicable where the strut channel is connected at two points to the structural steel support and the connector load occurs between the fastening points. Multi-span allowable load values are applicable where the strut channel is connected at multiple points (three or more fasteners) to the structural steel support and the connector load can occur in between any of the fastening points.
  12. Tabulated values for 13/16" strut may be used for 7/8" struts.
  13. Tabulated F2 loads include an adjustment factor of 0.90 for pierced strut channels. For pierced strut channels that have an 0.85 adjustment factor, the F2 loads shall be multiplied by 0.95 factor. No adjustment is required for F1, F3 and F4 loads.

Concrete Insert Allowable Load Embedded to Concrete

Concrete Insert Allowable Load Embedded to Concrete
  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 above. Use the minimum tabulated value for the connector and the anchorage load tables as applicable.

DSSCB Standoff Distances

DSSCB Standoff Distances

12 ga. 33 ksi Concrete Insert (by others)

12 ga. 33 ksi Concrete Insert (by others)
12 ga. 33 ksi Concrete Insert
12 ga. 33 ksi Concrete Insert
(by others)

Code Reports & Compliance

Drawings

PDF DWG DXF RFA IFC SAT

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