Description

This report demonstrates how statistical techniques can be used in the assessment of concrete structures to evaluate their condition and reliability and to assess the relative merits of possible repair options. A Reliability Toolkit provides licensed design professionals with a summary of some statistical methods that are useful for structural assessment. The report also gives two detailed examples of assessments for structural concrete repair.

Keywords:

confidence level; data analysis; durability; material properties; mean load method; rehabilitation; reliability; sample size; testing.

Document Details

Author: Innovation Task Group 11

Publication Year: 2024

Pages: 47

ISBN: 9781641952552

Formats: Protected PDF/Web View

Table of Contents

CHAPTER 1—INTRODUCTION AND SCOPE, p. 2

1.1—Introduction, p. 2

1.2—Scope, p. 2

CHAPTER 2—NOTATION, p. 2

CHAPTER 3—ASSESSMENT, p. 4

3.1—Planning, p. 4

3.2—Objective of testing program, p. 4

3.3—Properties and testing, p. 4

CHAPTER 4—BACKGROUND ON STATISTICAL TECHNIQUES, p. 5

4.1—Defining the population and determining sample sizes, p. 5

4.2—Characterizing data, p. 7

4.3—Comparing and combining datasets, p. 9

4.4—Bounding sample statistics using confidence intervals, p. 10

4.5—Determining fractile values, p. 13

4.6—Characterizing data representing extreme transient loads, p. 13

CHAPTER 5—RELIABILITY-BASED DURABILITY ASSESSMENT EXAMPLE, p. 14

5.1—Problem statement, p. 14

5.2—Structure details, p. 14

5.3—Assessment and testing methodology, p. 15

5.4—Condition assessment plan, p. 15

5.5—Reinforcement cover measurements, p. 16

5.6—Carbonation depth measurements, p. 18

5.7—Evaluation results and conclusion, p. 19

CHAPTER 6—RELIABILITY-BASED STRENGTH ASSESSMENT EXAMPLE, p. 20

6.1—Problem statement, p. 21

6.2—Preliminary assessment, p. 21

6.3—Detailed assessment: Case of good documentation, p. 22

6.4—Detailed assessment: Case of no documentation, p. 23

6.5—Strength assessment by mean load method, p. 27

6.6—Comparison of methods, p. 31

6.7—Summary, p. 31

CHAPTER 7—SUMMARY, p. 31

CHAPTER 8—REFERENCES, p. 32

Authored documents, p. 33

APPENDIX A—RELIABILITY TOOLKIT FOR ASSESSMENT OF EXISTING CONCRETE STRUCTURES, p. 33

A.1—Introduction, p. 33

A.2—Reliability index and mean load method, p. 33

A.3—Target reliability indexes, p. 34

A.4—Combinations of independent random variables, p. 34

A.5—Statistical parameters for resistance, p. 35

A.6—Extreme value distributions for transient load effects, p. 36

A.7—Defining “population” for sampling, p. 37

A.8—Data analysis, p. 37

A.9—Bayes’ theorem, p. 37

A.10—Examples, p. 38

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