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ACI 544.6R 15:2015 Edition

ACI 544.6R 15:2015 Edition

$49.02

544.6R-15 Report on Design and Construction of Steel Fiber-Reinforced Concrete Elevated Slabs

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ACI 2015 44
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Construction of slabs in areas with weak soil conditions has commonly used pile-supported slab structural design so that the adverse effects of soil-structure interaction in terms of differential settlement, cracking, or long-term serviceability problems are avoided. In this application, the construction of slabs on closely spaced pile caps (typical span-depth ratios between 8 and 30) is referred to as elevated ground slabs (EGSs). These slabs may be subjected to moderately high loading, such as concentrated point loading of up to 44 kip (150 kN) and uniformly distributed loadings of 1000 lb/ft2 (50 kN/m2). The dynamic loadings may be due to moving loads such as forklifts, travel lifts, and other material handling equipment. Fiber-reinforced concrete (FRC) has been successfully used to address the structural design of these slabs. Based on the knowledge gained, the area has been extended to a construction practice for slabs supported by columns as well. Applications are further extended to multi-story building applications. This report addresses the methodology for analysis, design, and construction of steel FRC (SFRC) slabs supported on piles or columns (also called elevated SFRC [E-SFRC]). Sections of the report address the history, practice, applications, material testing, full-scale testing, and certifications. By compiling the practice and knowledge in the analysis design with FRC materials, the steps in the design approach based on ultimate strength approach using two-way slab mechanisms are presented. The behavior of a two-way system may not require the flexural strength of conventional reinforced concrete (RC) because of redistribution, redundancy, and failure mechanisms. Methods of construction, curing, and full-scale testing of slabs are also presented. A high dosage of deformed steel fibers (85 to 170 lb/yd3 [50 to 100 kg/m3]) is recommended as the primary method of reinforcement. Procedures for obtaining material properties from round panel tests and flexural tests are addressed, and finite element models for structural analysis of the slabs are discussed. Results of several full-scale testing procedures that are used for validation of the methods proposed are also presented. Keywords: ductility; durability; fiber-reinforced cement-based materials; fibers; flexural strength; jointless slab; moment-curvature response; plastic shrinkage; reinforcing materials; shrinkage; shrinkage cracking; slab-onground; slab-on-piles; steel fibers; steel fiber-reinforced concrete; toughness; yield line analysis.

PDF Catalog

PDF Pages PDF Title
3 TITLE PAGE

TITLE PAGE
4 CHAPTER 1—INTRODUCTION
CHAPTER 1—INTRODUCTION
1.1—Introduction
1.1—Introduction
6 1.2—Scope
1.2—Scope
CHAPTER 2—NOTATION AND DEFINITIONS
CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
2.1—Notation
2.2—Definitions
2.2—Definitions
7 CHAPTER 3—HISTORICAL DEVELOPMENT OF SLABS-ON-GROUND AND ELEVATED STEEL FIBER-REINFORCED CONCRETE SLAB SYSTEMS
CHAPTER 3—HISTORICAL DEVELOPMENT OF SLABS-ON-GROUND AND ELEVATED STEEL FIBER-REINFORCED CONCRETE SLAB SYSTEMS
3.1—Historical background
3.1—Historical background
3.2—Advantages of G-SFRC and E-SFRC slab systems
3.2—Advantages of G-SFRC and E-SFRC slab systems
8 CHAPTER 4—CURRENT DESIGN METHODS AND CONSTRUCTION PRACTICES
CHAPTER 4—CURRENT DESIGN METHODS AND CONSTRUCTION PRACTICES
4.1—Introduction
4.1—Introduction
4.2—Existing standards and design methodologies
4.2—Existing standards and design methodologies
9 4.3—Slab dimensioning, fiber dosage rate, and typical loading conditions
4.3—Slab dimensioning, fiber dosage rate, and typical loading conditions
10 4.4—Additional construction provisions
4.4—Additional construction provisions
11 4.5—Limitations and areas of needed research
4.5—Limitations and areas of needed research
12 CHAPTER 5—MATERIAL AND STRUCTURAL DUCTILITY
CHAPTER 5—MATERIAL AND STRUCTURAL DUCTILITY
5.1—Introduction
5.1—Introduction
5.2—Material ductility
5.2—Material ductility
5.3—Structural ductility
5.3—Structural ductility
13 5.4—Two-way slab mechanism
5.4—Two-way slab mechanism
5.5—Test methods applicable to design
5.5—Test methods applicable to design
14 CHAPTER 6—DESIGN GUIDES FOR TENSILE STRAIN SOFTENING, DEFLECTION HARDENING MATERIALS
CHAPTER 6—DESIGN GUIDES FOR TENSILE STRAIN SOFTENING, DEFLECTION HARDENING MATERIALS
6.1—Structural analysis
6.1—Structural analysis
6.2—Approaches to evaluate nominal flexural strength of E-SFRC slabs
6.2—Approaches to evaluate nominal flexural strength of E-SFRC slabs
15 6.3—Design of E-SFRC based on yield-line theory applied to slabs
6.3—Design of E-SFRC based on yield-line theory applied to slabs
18 6.4—Evaluation of load capacity of E-SFRC slabs
6.4—Evaluation of load capacity of E-SFRC slabs
20 6.5—Examples
6.5—Examples
CHAPTER 7—FULL-SCALE TESTING OF ELEVATED SLABS
CHAPTER 7—FULL-SCALE TESTING OF ELEVATED SLABS
7.1—Full-scale elevated slab testing program available test results
7.1—Full-scale elevated slab testing program available test results
21 7.2—Test program
7.2—Test program
22 7.3—Discussion of full-scale structural tests
7.3—Discussion of full-scale structural tests
23 7.4—Comparison of experimental load capacity and model computed values
7.4—Comparison of experimental load capacity and model computed values
24 7.5—Design verification numerical examples
7.5—Design verification numerical examples
25 7.6—Verification of punching shear of piles
7.6—Verification of punching shear of piles
CHAPTER 8—REFERENCES
CHAPTER 8—REFERENCES
Authored references
Authored references
28 APPENDIXES
APPENDIXES
Appendix A—Nominal flexural strength of simply supported beam subjected to distributed loading
Appendix A—Nominal flexural strength of simply supported beam subjected to distributed loading
29 Appendix B—Nominal flexural strength of simply supported round slab subjected to center-point loading
Appendix B—Nominal flexural strength of simply supported round slab subjected to center-point loading
Appendix C—Nominal flexural strength of interior panel of elevated slab under uniformly distributed load
Appendix C—Nominal flexural strength of interior panel of elevated slab under uniformly distributed load
30 Appendix D—Nominal flexural strength of corner panel of elevated slab under uniformly distributed load
Appendix D—Nominal flexural strength of corner panel of elevated slab under uniformly distributed load
31 Appendix E—Nominal flexural strength of interior panel of elevated slab under uniformly distributed load and line load
Appendix E—Nominal flexural strength of interior panel of elevated slab under uniformly distributed load and line load
32 Appendix F—Nominal flexural strength of corner panel of elevated slab under uniformly distributed load and line load
Appendix F—Nominal flexural strength of corner panel of elevated slab under uniformly distributed load and line load
34 Appendix G—Nominal flexural strength of elevated slab submitted to point load
Appendix G—Nominal flexural strength of elevated slab submitted to point load
Appendix H—Moment capacity calculation based on post-cracking residual strength
Appendix H—Moment capacity calculation based on post-cracking residual strength
36 Appendix I—Yield line analysis of round panel tests
Appendix I—Yield line analysis of round panel tests
37 Appendix J—Allowable stresses at service conditions and shear failure criteria
Appendix J—Allowable stresses at service conditions and shear failure criteria
39 Appendix K—Influence of ϕH on load-carrying capacity of an E-SFRC slab
Appendix K—Influence of ϕH on load-carrying capacity of an E-SFRC slab

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