| Article Index |
|---|
| Product Information |
| Test Standards |
| Uses in the field |
| Slotted Deflection Track Property Table/Allowable Loads |
| SDT P.E. Drawings & Application |
Product Information
Table 7-D - PRECONDITIONED CYCLES | |
Type of Joint System | Number of Cycles |
Seismic | 100 |
Expansion/Contraction | 500 |
Wind Sway | 500 |
Test Standards
ASTM E-119 Standard for Fire Tests of Building Construction and Materials
Test of Bearing Wall and Partitions
14. Size of Specimen
14.1 The area exposed to fire shall be not less than 100 square feet (9 sq. rn), with neither dimension less that 9 ft (2.7m). The test specimen shall not be restrained on its vertical edges.
Cold-formed steel framing categories (CFSF)
AISI S201-07 Product Data Standard
Connectors are used in cold-formed steel construction to attach members (i.e. studs, joists) to each other or to the primary structure for the purpose of load transfer and support. Since an assembly is only as strong as its weakest component, it is important to engineer each connection so that it meets specified performance requirements. There are two main connection types. Fixed and Movement-Allowing (Slip). Fixed connections of framing members do not allow movement of the connected parts. They can be found in axial-load bearing walls, curtain walls, trusses, roofs, and floors. Movement-Allowing connections are designed to allow deflection of the primary structure in the vertical direction due to live load, or in the horizontal direction due to wind or seismic loads, or both vertical and horizontal directions. One application for a vertical movement- allowing connection is to isolate non-axial load bearing walls (drywall) from the vertical live load of the structure and to prevent damage to finishes. If the structure is in an active seismic zone, vertical and horizontal movement-allowing connections may be used to accommodate both the vertical deflection and horizontal drift of the structure.
Connectors may be fastened to cold-formed steel members and primary structure using welds, bolts, or self-drilling screws. These fastening methods are recognized in the American Iron and Steel Institute (AISI) 2007 North American Specification for the Design of Cold-Formed Steel Structural Members. Chapter E. Other fastening methods, such as clinching, power actuated fasteners (PAF), mechanical anchors, adhesive anchors and structural glue, are used based on manufacturer’s performance-based tests.
Deep Leg Deflection Track and Double Track methods do not allow for positive attachment with the
stud. There is no positive connection securing the stud to the deflection track above.
Uses in the field
“The System” Slotted Deflection Track (pat# 5,913,788):
The only patented single piece system for deflection at the head-of-wall with positive attachment. Meets or exceeds all known building codes. The only deflection track to pass full cycling and fire/hose stream tests as required. Testing in accordance with the UBC Standard 7-I and UL 2079, 2001.
Replaces:
Deep Leg Deflection Track
Problems:
NO POSITIVE ATTACHMENT for stud to deep leg track.
During a seismic event the integrity of the wall is compromised due to the fact that the studs are allowed to move perpendicular to the track, thus allowing the studs of the wall to simply slide out of the deep leg track because there is no attachment.
Double Track
Problems:
NO POSITIVE ATTACHMENT for inner track to outer track.
During a seismic event the integrity of the wall is compromised due to the fact that the studs attached to the inner track are allowed to move perpendicular to the outer track, thus allowing the studs and inner track of the wall to simply slide out of the outer track because there is no attachment.
Slotted Deflection Track Property Table/Allowable Loads
SDT P.E. Drawings & Application
