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ACI 441.1R 18:2018 Edition

ACI 441.1R 18:2018 Edition

$29.52

441.1R-18: Report on Equivalent Rectangular Concrete Stress Block and Transverse Reinforcement for High Strength Concrete Columns 2018

Published By Publication Date Number of Pages
ACI 2018 20
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This report provides a research summary of equivalent rectangular concrete compressive stress blocks and transverse reinforcement design requirements for high-strength concrete (HSC) columns. Because ACI 318 code provisions for column design are mostly based on concrete strengths less than 10,000 psi (70 MPa), the use of equivalent rectangular concrete stress block factors given in the code has been questioned. As a result, many alternative expressions have been developed. This report provides a summary of various suggestions of equivalent rectangular concrete stress block and design guidelines for HSC columns. The report also provides highlights of the research on the performance of HSC columns under various loading conditions, including monotonically increasing concentric or eccentric compression, and load reversals with increasing deformation and constant axial compression. The behavior of HSC columns subjected to combined axial load and bending moment is discussed. Various proposals for determining the amount and details of transverse reinforcement for seismic design are also reviewed.

PDF Catalog

PDF Pages PDF Title
3 TITLE PAGE
4 CHAPTER 1—INTRODUCTION
CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
5 2.2—Definitions
CHAPTER 3—EQUIVALENT RECTANGULAR CONCRETE STRESS BLOCK
3.1—ACI 318-14 concrete stress block
6 3.2—Other concrete stress blocks
8 3.3—Performance of ACI concrete stress block
9 CHAPTER 4—TRANSVERSE REINFORCEMENT
4.1—Constitutive models for confined concrete
10 4.2—Previous research and general observations
11 4.3—Equations for determining transverse reinforcement required in columns
12 4.4—Definition of limiting drift ratio on basis of expected drift demand
13 4.5—Use of high-strength reinforcement for transverse reinforcement
14 4.6—Maximum hoop spacing requirements for columns
15 CHAPTER 5—SUMMARY AND RECOMMENDATIONS
CHAPTER 6—REFERENCES
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