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ACI 439.6R 2019

ACI 439.6R 2019

$29.52

ACI PRC-439.6-19: Guide for the Use of ASTM A1035/A1035M Type CS Grade 100 (690) Steel Bars for Structural Concrete

Published By Publication Date Number of Pages
ACI 2019 104
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This guide provides recommendations on design provisions for the use of ASTM A1035/ASTM A1035M Type CS Grade 100 (690) deformed steel bars for reinforced concrete members. The recommendations address only those requirements of ACI 318-14 that limit efficient use of such steel bars. Other code requirements are not affected. Any other ACI 318 versions will be explicitly specified. Although there are limiting ACI 318 requirements, ACI 318-14 Section 1.10 would allow the use of high-strength reinforcement. Sponsors…shall have the right to present the data on which their design is based to the building official or to a board of examiners appointed by the building official. The International Building Code (IBC 2012) would allow the same under Section 104.11, Alternative materials, design and methods of construction and equipment . To approve an alternative material under this section, a building department would typically require an ICC Evaluation Service (ICC-ES) Evaluation Report, which would be based on an ICC-ES Acceptance Criteria (AC) document. An AC document (ICC-ES AC429) and an Evaluation Report (ICC-ES ESR-2107) exist, permitting the use of ASTM A1035/A1035M Grade 100 reinforcement. This guide includes a discussion of the material characteristics of Grade 100 (690) ASTM A1035/A1035M (CS) deformed steel bars and recommends design criteria for beams, columns, slab, systems, walls, and footings for Seismic Design Category (SDC) A, B, or C, and for structural components not designated as part of the seismic-force-resisting system for SDC D, E, or F. A structure assigned to SDC A, B, or C is required to be designed for all applicable gravity and environmental loads. In the case of SDC A structures, seismic forces are notional structural integrity forces. This guide addresses all design required for SDC A, B, and C structures. Because the modulus of elasticity for ASTM A1035/A1035M (CS) is similar to that of carbon steel (ASTM A615/A615M) using higher specified minimum yield strength fy may result in higher steel stress at service load condition and potentially cause wider cracks and larger deflections, which may be objectionable if aesthetics and water-tightness are critical design requirements. Higher deflection can also contribute to serviceability issues. Also, with higher fy, the required development length will be longer. Keywords: bar; design; guide; high-strength steel; structural.

PDF Catalog

PDF Pages PDF Title
3 TITLE PAGE
5 CHAPTER 1—INTRODUCTION
1.1—Objective
1.2—Scope
1.3—Historical perspective and background
6 1.4—Reinforcing steel grades availability
1.5—Introduction of ASTM A1035/A1035M Type CS Grade 100
CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
7 2.2—Definitions
8 CHAPTER 3—MATERIAL PROPERTIES
3.1—Introduction
3.2—Weights, dimensions, and deformations
3.3—Specified tensile properties
9 3.4—Measured tensile properties
11 3.5—Actual compressive properties
3.6—Chemical composition
CHAPTER 4—BEAMS
4.1—Introduction
4.2—Flexural strength
12 4.3—Tension- and compression-controlled limits
13 4.4—Strength reduction factor ϕ
4.5—Stress in steel due to flexure
14 4.6—Compression stress limit
4.7—Moment redistribution
4.8—Deflection
15 4.9—Crack control
16 4.10—Minimum reinforcement
17 4.11—Strength design for shear
CHAPTER 5—COLUMNS
5.1—Introduction
5.2—Specified minimum yield strength for longitudinal reinforcement
5.3—Specified minimum yield strength for transverse reinforcement
18 5.4—Slenderness effect
CHAPTER 6—SLAB SYSTEMS
6.1—One-way slabs
6.2—Shear design of one-way slabs
6.3—Two-way slabs
19 CHAPTER 7—WALLS
7.1—Introduction
7.2—Vertical reinforcement
7.3—Horizontal reinforcement
7.4—Shear reinforcement
7.5—Minimum reinforcement
CHAPTER 8—FOOTINGS AND PILE CAPS
8.1—Design
CHAPTER 9—MAT FOUNDATIONS
9.1—Design
CHAPTER 10—OTHER DESIGN CONSIDERATIONS
10.1—Seismic design limitations
20 10.2—Development and lap splice length
21 10.3—Mechanically spliced bars and headed bars
10.4—Bending and welding of bars
22 10.5—Use of ASTM A1035/A1035M (CS) bars with ASTM A615/A615M bars
CHAPTER 11—SUMMARY
23 CHAPTER 12—REFERENCES
Authored documents
26 APPENDIX A—DESIGN EXAMPLES
A.1—Introduction
A.2—Design examples
88 APPENDIX B—FLEXURAL ANALYSIS USING NONLINEAR STRESS-STRAIN CURVE OF ASTM A1035/A1035M (CS) GRADE 100 (690) REINFORCEMENT
B.1—Introduction
B.2—Design assumptions
B.3—Spreadsheet implementation
90 B.4—Design examples
100 APPENDIX C—FLEXURAL BEHAVIOR OF BEAMS REINFORCED WITH ASTM A1035/A1035M BARS

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