ACI 349 Appendix B was developed in the mid 1970s following review of design methods and available test data. Since that time there has been extensive additional test data. In 1992, a task group was formed to compare the Appendix B methodology to that of the Concrete Capacity Design (CCD) Method for all available tests results. The review indicated that concrete breakout failures were predicted better (for example, for bolt groups, and edge conditions) by the new prediction equations in the Concrete Capacity Design Method than by the design method of Appendix B. After extensive review, ACI 349 chose to incorporate the Concrete Capacity Design Method to improve the requirements of the previous Appendix B. Therefore, Appendix D of ACI 349 was developed to better define the design requirements for steel embedments. Revisions are periodically made to the code as a result of on-going research and testing. As with other concrete building codes, the design of steel embedments attempts to assure a ductile failure mode so that the embedment reinforcement yields before the concrete fails. In embedments designed for direct [or tensile] loading, the concrete pullout strength must be greater than the tensile strength of the steel. This report presents a series of design examples of ductile steel embedments. These examples have been updated to include the revision incorporated in Appendix D of ACI 349-06. Keywords: Anchorage (structural); anchor bolts; anchors (fasteners); concrete capacity design (CCD); embedment; inserts; load transfer; studs.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 3<\/td>\n | CONTENTS <\/td>\n<\/tr>\n | ||||||
| 4<\/td>\n | INTRODUCTION NOTATION <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | COMMENTARY <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | PART A\u2014 Examples: Ductile single embedded element in semi-infinite concrete Example A1\u2014Single stud, tension only, no edge effects <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | Example A2\u2014Single stud, shear only <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Example A3\u2014Single stud, combined tension and shear <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Example A4\u2014Single bolt, combined tension and shear <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | PART B\u2014 Examples: Ductile multiple embedded elements in semi-infinite concrete Example B1(a)\u2014Four-stud embedded plate, tension only, wide spacing <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Example B1(b)\u2014Four-stud embedded plate, tension only, close spacing <\/td>\n<\/tr>\n | ||||||
| 34<\/td>\n | Example B1(c)\u2014Four-bolt surface-mounted plate, tension only, close spacing, close to a corner <\/td>\n<\/tr>\n | ||||||
| 38<\/td>\n | Example B2(a)\u2014Four-stud embedded plate, combined shear and uniaxial moment <\/td>\n<\/tr>\n | ||||||
| 45<\/td>\n | Example B2(b)\u2014Four-anchor surface-mounted plate, combined shear and uniaxial moment <\/td>\n<\/tr>\n | ||||||
| 53<\/td>\n | Example B3\u2014Four-threaded anchors and surface-mounted plate, combined axial, shear, and moment <\/td>\n<\/tr>\n | ||||||
| 63<\/td>\n | Example B4(a)\u2014Four-stud embedded plate in thin slab, tension only <\/td>\n<\/tr>\n | ||||||
| 65<\/td>\n | Example B4(b)\u2014Four-stud rigid embedded plate in thin slab, tension only <\/td>\n<\/tr>\n | ||||||
| 68<\/td>\n | APPENDIX A\u2014 TABLES Table 1\u2014Materials for headed and threaded anchors* Table 2\u2014Threaded fastener dimensions* <\/td>\n<\/tr>\n | ||||||
| 69<\/td>\n | Table 3(a)\u2014Required embedment for ductile behavior: Free field\u2014single threaded cast-in headed bolt anchor ( F 1554 Grade 36, Reference D. 3.6.1, 0.85 factor) Table 3(b)\u2014Required embedment for ductile behavior: Free field\u2014single threaded cast-in headed bolt anchor ( F 1554 Grade 105, Reference D. 3.6.1, 0.85 factor) Table 3(c)\u2014Required embedment for ductile behavior: Free field\u2014single threaded cast-in headed stud <\/td>\n<\/tr>\n | ||||||
| 70<\/td>\n | Table 4(a)\u2014Anchor head and nut (square head) dimensions* Table 4(b)\u2014Anchor head and nut (hex head) dimensions* <\/td>\n<\/tr>\n | ||||||
| 71<\/td>\n | Table 4(c)\u2014Anchor head and nut (heavy hex) dimensions* <\/td>\n<\/tr>\n | ||||||
| 72<\/td>\n | Table 5\u2014Hardened washer dimensions Table 6\u2014Stud dimensions* (Steel: ASTM A 108; <\/td>\n<\/tr>\n | ||||||
| 73<\/td>\n | APPENDIX B of 349.2R ACI 349, Appendix D, Code and Commentary ( Appendix Commentary follows the Code) APPENDIX D\u2014 ANCHORING TO CONCRETE D.1\u2014 Definitions D.2\u2014Scope D.2.1 D.2.2 <\/td>\n<\/tr>\n | ||||||
| 74<\/td>\n | D.2.3 D.2.4 D.2.5 D.2.6 D.3\u2014General requirements D.3.1 D.3.2 D.3.3 D.3.4 D.3.5 D.3.6 Embedment design D.3.6.1 D.3.6.2 D.3.6.3 D.3.7 D.3.8 D.3.9 D.3.10 D.3.11 D.4\u2014General requirements for strength of anchors D.4.1 D.4.1.1 <\/td>\n<\/tr>\n | ||||||
| 75<\/td>\n | D.4.1.2 D.4.1.3 D.4.2 D.4.2.1 D.4.2.2 D.4.3 D.4.4 D.4.5 D.4.6 Bearing strength D.4.6.1 D.4.6.2 <\/td>\n<\/tr>\n | ||||||
| 76<\/td>\n | D.5\u2014Design requirements for tensile loading D.5.1 Steel strength of anchor in tension D.5.1.1 D.5.1.2 D.5.2 Concrete breakout strength of anchor in tension D.5.2.1 D.5.2.2 D.5.2.3 D.5.2.4 D.5.2.5 D.5.2.6 D.5.2.7 <\/td>\n<\/tr>\n | ||||||
| 77<\/td>\n | D.5.2.8 D.5.2.9 D.5.3 Pullout strength of anchor in tension D.5.3.1 D.5.3.2 D.5.3.3 D.5.3.4 D.5.3.5 D.5.4 Concrete side-face blowout strength of a headedanchor in tension D.5.4.1 D.5.4.2 D.6\u2014Design requirements for shear loading D.6.1 Steel strength of anchor in shear D.6.1.1 D.6.1.2 D.6.1.3 D.6.1.4 D.6.2 Concrete breakout strength of anchor in shear <\/td>\n<\/tr>\n | ||||||
| 78<\/td>\n | D.6.2.1 D.6.2.2 D.6.2.3 D.6.2.4 D.6.2.5 D.6.2.6 D.6.2.7 <\/td>\n<\/tr>\n | ||||||
| 79<\/td>\n | D.6.3 Concrete pryout strength of anchor in shear D.6.3.1 D.7\u2014Interaction of tensile and shear forces D.7.1 D.7.2 D.7.3 D.8\u2014Required edge distances, spacings, and thicknesses to preclude splitting failure D.8.1 D.8.2 D.8.3 D.8.4 D.8.5 D.8.6 D.8.7 D.9\u2014Installation of anchors D.9.1 D.9.2 D.9.3 D.10\u2014Structural plates, shapes, and specialty inserts D.10.1 D.10.2 D.10.3 <\/td>\n<\/tr>\n | ||||||
| 80<\/td>\n | D.11\u2014Shear strength of embedded plates and shear lugs D.11.1 General D.11.2 Shear toward free edge D.11.3 Shear strength of embedments with embedded base \nplates D.12\u2014Grouted embedments D.12.1 D.12.2 D.12.3 D.12.4 D.12.5 APPENDIX RD\u2014 ANCHORING TO CONCRETE COMMENTARY RD.1\u2014Definitions RD.2\u2014Scope RD.2.1 RD.2.3 <\/td>\n<\/tr>\n | ||||||
| 81<\/td>\n | RD.2.6 RD.3\u2014General requirements RD.3.1 <\/td>\n<\/tr>\n | ||||||
| 82<\/td>\n | RD.3.3 RD.3.4 RD.3.5 RD.3.6.1 RD.3.6.2 RD.3.6.3 RD.3.8 RD.3.9 <\/td>\n<\/tr>\n | ||||||
| 83<\/td>\n | RD.3.10 RD.4\u2014General requirements for strength of anchors RD.4.1 RD.4.2 and RD.4.3 RD.4.2.1 <\/td>\n<\/tr>\n | ||||||
| 84<\/td>\n | RD.4.2.2 RD.4.4 RD.4.5 <\/td>\n<\/tr>\n | ||||||
| 85<\/td>\n | RD.4.6 Bearing strength RD.4.6.1 RD.4.6.2 RD.5\u2014Design requirements for tensile loading RD.5.1 Steel strength of anchor in tension RD.5.1.2 RD.5.2 Concrete breakout strength of anchors in tension RD.5.2.1 RD.5.2.2 RD.5.2.3 <\/td>\n<\/tr>\n | ||||||
| 87<\/td>\n | RD.5.2.4 RD.5.2.5 RD.5.2.6 RD.5.2.7 RD.5.2.8 RD.5.3 Pullout strength of anchor in tension RD.5.3.2 <\/td>\n<\/tr>\n | ||||||
| 88<\/td>\n | RD.5.3.3 RD.5.3.4 RD.5.4 Concrete side-face blowout strength of a headed \nanchor in tension RD.6\u2014Design requirements for shear loading RD.6.1 Steel strength of anchor in shear RD.6.1.2 RD.6.1.3 RD.6.1.4 RD.6.2 Concrete breakout strength of anchor in shear RD.6.2.1 <\/td>\n<\/tr>\n | ||||||
| 89<\/td>\n | RD.6.2.2 <\/td>\n<\/tr>\n | ||||||
| 90<\/td>\n | RD.6.2.3 RD.6.2.4 RD.6.2.5 <\/td>\n<\/tr>\n | ||||||
| 91<\/td>\n | RD.6.2.7 RD.6.3 Concrete pryout strength of anchor in shear RD.7\u2014Interaction of tensile and shear forces RD.8\u2014Required edge distances, spacings, and thicknesses to preclude splitting failure RD.8.2 RD.8.3 RD.8.4 RD.8.5 RD.8.6 RD.9\u2014Installation of anchors RD.10\u2014Structural plates, shapes, and specialty inserts RD.11\u2014Shear strength of embedded plates and shear lugs RD.11.1 Shear lugs <\/td>\n<\/tr>\n | ||||||
| 92<\/td>\n | RD.11.3 Shear strength of embedments with embedded \nbase plates References <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" 349.2R-07 Guide to the Concrete Capacity Design (CCD) Method – Embedment Design Examples (Reapproved 2014)<\/b><\/p>\n |