UFC 4-023-03
25 January 2005
CONTENTS
Page
CHAPTER 1 INTRODUCTION ............................................................................... 1-1
Paragraph
1-1
PURPOSE AND SCOPE ......................................................
1-1
1-2
APPLICABILITY....................................................................
1-1
1-3
GENERAL.............................................................................
1-1
1-3.1
Significance of Progressive Collapse....................................
1-1
1-3.2
Hardening of Structures to Resist Initial Damage .................
1-2
1-3.3
Design Approaches. .............................................................
1-2
1-3.4
Existing Design Guidelines. ..................................................
1-3
1-4
SUMMARY OF PROGRESSIVE COLLAPSE DESIGN
PROCEDURE.......................................................................
1-4
1-5
INSPECTION REQUIREMENTS. .........................................
1-4
1-6
SECURITY ENGINEERING UFC SERIES. ..........................
1-4
CHAPTER 2 PROGRESSIVE COLLAPSE DESIGN REQUIREMENTS FOR NEW
AND EXISTING CONSTRUCTION
Paragraph
2-1
DESIGN REQUIREMENTS FOR NEW AND EXISTING
CONSTRUCTION..............................................................................
2-1
2-1.1 Very Low Level of Protection Design Requirement...............
2-1
2-1.2 Low Level of Protection Design Requirement. ......................
2-1
2-1.3 Medium and High Level of Protection Design Requirement..
2-4
2-2
COMMON DESIGN REQUIREMENTS.................................
2-6
2-2.1 Effective Column and Wall Height. .......................................
2-6
2-2.2 Upward Loads on Floors and Slabs. .....................................
2-6
CHAPTER 3 DESIGN STRATEGIES
Paragraph
3-1
TIE FORCES. ....................................................................... 3-1
3-1.1
Load and Resistance Factor Design for Tie Forces.............. 3-1
3-1.2
Required Tie Strength........................................................... 3-2
3-1.3
Structural Elements and Connections With Inadequate
Design Tie Strength. ............................................................. 3-2
3-2
ALTERNATE PATH METHOD.............................................. 3-4
3-2.1
General. ................................................................................ 3-4
3-2.2
Load and Resistance Factor Design for Alternate
Path Method. ........................................................................ 3-5
3-2.3
Removal of Load-Bearing Elements for the Alternate
Path Method. ........................................................................ 3-5
3-2.4
Factored Loads for Alternate Path Method. ..........................3-10
3-2.5
Material Properties................................................................3-11
3-2.6
Damage Limits for the Structure. ..........................................3-14
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