CEMP-E
TI 809-07
30 November 1998
CHAPTER 1
INTRODUCTION
1. PURPOSE AND SCOPE. This document provides design guidance on the use of cold-formed steel
systems for both load-bearing (Chapter 2) and nonload-bearing (Chapter 4) applications. Also, criteria
are provided to use load-bearing systems in shear wall (Chapter 3) applications. The nonload-bearing
application guidance in Chapter 4 also includes provisions for the masonry wythe and moisture
protection of complete masonry veneer/steel stud curtain wall systems.
2. APPLICABILITY. These instructions are applicable to all elements responsible for the design of
military construction. Exceptions to this criteria will require Corps of Engineers Headquarters (CEMP-
ET) approval.
3. REFERENCES. Appendix A contains a list of references used in these instructions.
4. PARTNERING EFFORT. This document is the result of partnering between industry and
Government with emphasis on Green Building Technology. Designers should require materials,
products and innovative construction methods and techniques which are environmentally sensitive,
take advantage of recycling and conserve natural resources. Funding for this effort came from the
Green Building Program.
5. DESIGN CONCERNS UNIQUE TO COLD-FORMING.
a. General. The AISI Specification is applicable to sheet and strip steels with thicknesses of 6.35
mm ( in) or less, but steel plates and bars up to 25.4 mm (1 in) can successfully be used as structural
shapes. Designers working with cold-formed steel products will account for several unique conditions
not normally found in AISC steel designs as outlined below:
Effective section properties are based on the design stress of the loading condition being
analyzed,
Lateral-torsional buckling is a special buckling condition unique to the cold-formed design of
compression members,
Local buckling of section elements, and the lateral buckling of members is different than
typically found in AISC steel design,
Connections can be assembled using welds, screws, or bolts. Crimping is not allowed as
well as powder driven pins. However, powder driven pins can be used to attach wall tracks
to concrete floors, foundations, and steel superstructures,
A Deign Process for Load-bearing Cold-Formed Steel Systems Flowchart is shown as
Figure 1-1.
b. Seismic Design The seismic design guidance provided in Chapter 3 will only be used for
Performance Objective 1A (Life Safety Performance Objective Level defined in TI 809-04) for all
seismic ground motion levels and enhanced Performance Objectives (2A, 2B and 3B) for Seismic
Design Categories A and B. The definition of performance objectives and seismic design categories
are provided in TI 809-04, Seismic Design for Buildings.
Seismic design with cold-formed steel has two inherent problems with the material itself. The first is
light gauge thickness of the cold-formed steel materials and the second is the material strength
variability. The objective of seismic design guidance is to ensure ductile building system performance
in the large seismic event and elastic response in the small event or wind loading. Ductile building
performance
1-1
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