Abstract: ACI 355.2 prescribes testing programs and evaluation requirements for post-installed mechanical anchors intended for use in concrete under the design provisions of ACI 318. Criteria are prescribed for determining whether anchors are acceptable for use in uncracked concrete only, or in cracked as well as uncracked concrete. Performance categories for anchors are established, as are the criteria for assigning anchors to each category. The anchor performance categories are used by ACI 318 to assign capacity reduction factors and other design parameters.

Keywords: anchors; cracked concrete; expansion anchors; fasteners; mechanical anchors; post-installed anchors; undercut anchors.

Contents: CONTENTS

STANDARD

Chapter 1—Scope, p. 355.2-3

Chapter 2—Definitions and notation, p. 355.2-3

2.1—Definitions

2.2—Notation

Chapter 3—Significance and use, p. 355.2-6

Chapter 4—General requirements, p. 355.2-6

4.1—Testing sequence

4.2—Test samples

4.3—Testing by independent testing and evaluation agency and by manufacturer

4.4—Changes to product

Chapter 5—Requirements for test specimens,installing anchors, and conducting tests, p. 355.2-8

5.1—Concrete for test members

5.2—Anchor installation

5.3—Test methods

5.4—Tests in cracked concrete

5.5—General requirements for anchor behavior

Chapter 6—Requirements for anchor identification, p. 355.2-12

6.1—Determination of critical characteristics of anchors

6.2—Specification of critical characteristics of anchors

6.3—Verification of conformance to drawings and specifications

Chapter 7—Reference tests, p. 355.2-12

7.1—Purpose

7.2—Reference tension tests for single anchors without spacing and edge effects (Table 4.1, Tests 1 and 2, or Table 4.2, Tests 1, 2, 3, and 4)

7.3—Required calculations using results of reference tests

Chapter 8—Reliability tests, p. 355.2-13

8.1—Purpose

8.2—Reliability tests using reduced installation effort (Table 4.1, Test 3, and Table 4.2, Test 5)

8.3—Reliability in low-strength concrete with large drill bit (Table 4.1, Test 4, and Table 4.2, Test 6)

8.4—Reliability in high-strength concrete with small drill bit (Table 4.1, Test 5, and Table 4.2, Test 7)

8.5—Reliability under repeated load (Table 4.1, Test 6)

8.6—Reliability in cracked concrete where crack width is cycled (Table 4.2, Test 8)

Chapter 9—Service-condition tests, p. 355.2-15

9.1—Purpose

9.2—Service-condition tension test with single anchor and with two edges (corner) (Table 4.1, Test 7, and Table 4.2, Test 9)

9.3—Service-condition test at minimum edge distance and minimum spacing (Table 4.1, Test 8, and Table 4.2, Test 10)

9.4—Service-condition shear test for single anchors without spacing and edge effects (Table 4.1, Test 9,and Table 4.2, Test 11)

9.5—Service-condition, simulated seismic tension tests (Table 4.2, Test 12)

9.6—Service-condition, simulated seismic shear tests (Table 4.2, Test 13)

Chapter 10—Establishing anchor categories, p. 355.2-18

Chapter 11—Presenting anchor data, p. 355.2-18

11.1—Data analysis

11.2—Format of data sheet

11.3—General requirements

11.4—Contents of evaluation report

Chapter 12—Requirements for independent testing and evaluation agency, p. 355.2-19

Chapter 13—References, p. 355.2-19

13.1—Referenced standards

MANDATORY APPENDIXES

Appendix A1—Requirements for normalization of results, p. 355.2-21

A1.1—Normalization of capacities to take account of concrete and steel strengths

A1.2—Concrete breakout or splitting failure

A1.3—Pullout and pull-through failure

A1.4—Steel failure

Appendix A2—Requirements for establishing characteristic capacities, p. 355.2-21

A2.1—Scope

A2.2—Procedure

Appendix A3—Requirements for test members,p. 355.2-21

A3.1—Tests in uncracked concrete

A3.2—Tests in cracked concrete

A3.3—Casting and curing of test members

COMMENTARY

Chapter R1—Scope, p. 355.2-23

Chapter R2—Definitions and notation, p. 355.2-23

R2.1—Definitions

R2.2—Notation

Chapter R3—Significance and use, p. 355.2-23

Chapter R4—General requirements, p. 355.2-23

R4.1—Testing sequence

R4.2—Test samples

Chapter R5—Requirements for test specimens, installing anchors, and conducting tests, p. 355.2-26

R5.1—Concrete for test members

R5.2—Anchor installation

R5.4—Tests in cracked concrete

R5.5—General requirements for anchor behavior

Chapter R6—Requirements for anchor identification, p. 355.2-28

R6.3—Verification of conformance to drawings and specifications

Chapter R7—Reference tests, p. 355.2-28

R7.2—Reference tension tests for single anchors without spacing and edge effects (Table 4.1, Tests 1 and 2,

or Table 4.2, Tests 1, 2, 3, and 4)

R7.3—Required calculations using results of reference tests

Chapter R8—Reliability tests, p. 355.2-29

R8.2—Reliability tests using reduced installation effort

(Table 4.1, Test 3, and Table 4.2, Test 5)

R8.3—Reliability in low-strength concrete with large drill

bit (Table 4.1, Test 4, and Table 4.2, Test 6)

R8.4—Reliability in high-strength concrete with small

drill bit (Table 4.1, Test 5, and Table 4.2, Test 7)

R8.5—Reliability under repeated load (Table 4.1, Test 6)

R8.6—Reliability in cracked concrete where crack width is cycled (Table 4.2, Test 8)

Chapter R9—Service-condition tests, p. 355.2-30

R9.2—Service-condition tension test with single anchor and with two edges (corner) (Table 4.1, Test 7, and Table 4.2, Test 9)

R9.3—Service-condition test at minimum edge distance and minimum spacing (Table 4.1, Test 8, and Table 4.2, Test 10)

R9.4—Service-condition shear test for single anchors

without spacing and edge effects (Table 4.1, Test 9,

and Table 4.2, Test 11)

R9.5—Service-condition, simulated seismic tension tests

(Table 4.2, Test 12)

R9.6—Service-condition, simulated seismic shear tests (Table 4.2, Test 13)

Chapter R11—Presenting anchor data, p. 355.2-31

Chapter R13—References, p. 355.2-31

R13.1—Cited references

Appendix RA1—Requirements for normalization of results, p. 355.2-31

RA1.2—Concrete breakout or splitting failure

RA1.3—Pullout and pull-through failure Appendix RA3—Requirements for test members, p. 355.2-31

RA3.2—Tests in cracked concrete

EXAMPLE EVALUATION OF A WEDGE-TYPE ANCHOR IN UNCRACKED CONCRETE

E1—Anchor specifications, p. 355.2-32

E2—Test results, p. 355.2-32

E3—Evaluation, p. 355.2-32

E3.1—General

E3.2—Reference tests in uncracked low-strength concrete

E3.3—Reference tests in uncracked high-strength concrete

E3.4—Reliability tests, reduced installation effort

E3.5—Reliability tests, large hole diameter

E3.6—Reliability tests, small hole diameter

E3.7—Reliability tests, repeated load

E3.8—Service-condition tests, corner test

E3.9—Service-condition tests, minimum edge distance and spacing

E3.10—Service-condition tests, shear tests

E4—Establishing anchor category, p. 355.2-35

E5—Report of anchor data, p. 355.2-35