Concat us[email protected]
Shopping Cart

No products in the cart.

🔍
ACI 544.8R 16:2016 Edition

ACI 544.8R 16:2016 Edition

$38.19

544.8R-16: Report on Indirect Method to Obtain Stress-Strain Response of Fiber-Reinforced Concrete (FRC)

Published By Publication Date Number of Pages
ACI 2016 28
PDF Format Searchable Printable Preview Now
Guaranteed Safe Checkout
Category:

If you have any questions, feel free to reach out to our online customer service team by clicking on the bottom right corner. We’re here to assist you 24/7.
Email:[email protected]

Development of proper design procedures for fiber-reinforced concrete (FRC) materials requires use of material tensile and compressive stress strains that reflect the contribution of fibers to the post-cracking behavior. While uniaxial tension tests provide the most fundamental material properties, conducting closed-loop tension tests are difficult to accomplish; therefore, methods based on indirect measurement of tensile properties using flexural tests are typically used. This report presents the methodologies that are used for data reduction and presentation of the flexural test results in terms of an equivalent tensile stress-strain response for FRC materials. Existing methods for estimating uniaxial tensile stress-strain response of strain-softening and hardening FRCs from flexural beam-test data are introduced. Different approaches applied to beam tests based on elastic equivalent, curve fitting, or back-calculation of flexural data are introduced. These are divided into two general categories: elastic equivalent approach or inverse analysis method. In the elastic equivalent approach, a summary of available test methods by various code agencies are presented. Using back-calculation methods, tools based on the finite element method and analytical closed-form solutions are presented. An approach is presented that uses closed-form moment-curvature relationships and obtains load-deflection responses for a beam of three- or four-point loading. The method is used to obtain equivalent parametric tensile stress and strain relationships for a variety of FRC materials. The methods are compared against the available residual strength and also elastically equivalent residual strengths obtained by different specimen geometries. Results for a range of FRC materials studied show the back-calculated post-peak residual tensile strength is approximately 30 to 37 percent of the elastically equivalent flexural residual strength for specimens with different fiber types and volume fractions. Keywords: fiber-reinforced concrete; inverse analysis; tensile stress-strain diagram.

PDF Catalog

PDF Pages PDF Title
3 TITLE PAGE
4 CHAPTER 1—INTRODUCTION AND SCOPE
1.1—Introduction
5 1.2—Scope
CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
6 2.2—Definitions
CHAPTER 3—TENSILE AND FLEXURAL TESTING AND MECHANICAL PROPERTIES
3.1—Tension and flexural testing
3.2—Strain softening and hardening
7 3.3—Deflection softening and hardening
8 3.4—Equivalent tensile stress-strain responses
3.5—Inverse analysis methods
CHAPTER 4—TEST METHODS
4.1—Test and specimen types
9 4.2—Stress-strain diagrams
4.3—Stress-strain diagram in RILEM approach
4.4—Flexural tensile strength ft,fl and residual flexural tensile strengths fR,1 and fR,4
10 4.5—Relationship between uniaxial tensile stress and flexural strength
4.6—Tensile stress-strain diagrams and strain values ε1, ε2, and ε3
12 CHAPTER 5—STRESS-STRAIN CURVES BY BACK-CALCULATION APPROACH
5.1—Parametric stress-strain curves
14 5.2—Back-calculation of flexural test data
5.3—Comparison with averaged residual strength results
15 5.4—Comparison with RILEM and JCI methods
CHAPTER 6—CONCLUSIONS
16 CHAPTER 7—REFERENCES
Authored documents
18 APPENDIX A—SPREADSHEET-BASED INVERSE ANALYSIS PROCEDURES
A.1—Simplified strain-softening/hardening fiber-reinforced concrete model
19 A.2—Derivation of moment-curvature diagram
A.3—Derivation of nominal flexural strength
21 A.4—Simplified moment curvature diagram
22 A.5—Load-deflection response
23 A.6—Example: Three-point bending test

Related products

ACI 544.8R 16
$38.19