TABLE OF CONTENTS 16.sTructural integrity 253 16.6--Connection and bearing design 16.7-ltems embedded after concrete placement 16.8-Marking and identification 16.9-Handling 16.10-Strength evaluation of precast construction 257 CHAPTER 17--COMPOSITE CONCRETE FLEXURAL MEMBERS 259 17.1-Scope 990 17. 5-Horizontal shear strength 17.6--Ties for horizontal shear CHAPTER 18--PRESTRESSED CONCRETE 面a面面面a压面面a面面国面面面面面正面面面面 263 18.1-Scope 18.2--General 18.3-Design assumptions 18. 4-Serviceability requirements-Flexural members 18.5-Permissible stresses in prestressing steel 18.6--Loss of prestress 18.7-Flexural strength 18.8--Limits for reinforcement of flexural members 18.9--Minimum bonded reinforcement 18. 10-Statically indeterminate structures 275 18. 11--Compression members--Combined flexure and axial loads 18. 12-Slab systems 18. 13-Post-tensioned tendon anchorage zones 18. 14-Design of anchorage zones for monostrand or single 16 mm diameter bar tendons 283 18. 15-Design of anchorage zones for multistrand tendons 18. 16--Corrosion protection for unbonded tendons 284 18.17-Post-tensioning ducts 18.18--Grout for bonded tendons 18.19-Protection for prestressing steel 18.20-Application and measurement of prestressing force 18.21-Post-tensioning anchorages and couplers 18.22-External post-tensioning CHAPTER 19--SHELLS AND FOLDED PLATE MEMBERS .29 19.1-Scope and definitions 19.2-Analysis and desig 19.3-Design strength of materials 19.4-Shell reinforcement 295 19.5---Construction CHAPTER 20--STRENGTH EVALUATION OF EXISTING STRUCTURES .299 20.1-Strength evaluation-General 20.2-Determination of required dimensions and material properties 20.3-Load test procedure 20.4-Loading criteria 20.5-Acceptance criteria 20.6-Provision for lower load rating 20.7-Safety 304 CHAPTER 21--SPECIAL PROVISIONS FOR SEISMIC DESIGN 305 21.1--Definitions 21.2-General requirements 21.3-Flexural members of special moment frames licene with Acl oduction of networking permitted without loene from H ACl 318 Building CNot tor Resale. 1/282005182015 MSTryTABLE OF CONTENTS 5 ACI 318 Building Code and Commentary 16.5—Structural integrity ..................................................................................................................................................... 253 16.6—Connection and bearing design ................................................................................................................................ 255 16.7—Items embedded after concrete placement............................................................................................................... 257 16.8—Marking and identification ......................................................................................................................................... 257 16.9—Handling.................................................................................................................................................................... 257 16.10—Strength evaluation of precast construction............................................................................................................ 257 CHAPTER 17—COMPOSITE CONCRETE FLEXURAL MEMBERS.................................................. 259 17.1—Scope........................................................................................................................................................................ 259 17.2—General ..................................................................................................................................................................... 259 17.3—Shoring...................................................................................................................................................................... 260 17.4—Vertical shear strength .............................................................................................................................................. 260 17.5—Horizontal shear strength.......................................................................................................................................... 260 17.6—Ties for horizontal shear ........................................................................................................................................... 261 CHAPTER 18—PRESTRESSED CONCRETE.................................................................................... 263 18.1—Scope........................................................................................................................................................................ 263 18.2—General ..................................................................................................................................................................... 264 18.3—Design assumptions.................................................................................................................................................. 265 18.4—Serviceability requirements—Flexural members ...................................................................................................... 266 18.5—Permissible stresses in prestressing steel ................................................................................................................ 269 18.6—Loss of prestress....................................................................................................................................................... 269 18.7—Flexural strength ....................................................................................................................................................... 271 18.8—Limits for reinforcement of flexural members............................................................................................................ 272 18.9—Minimum bonded reinforcement ............................................................................................................................... 273 18.10—Statically indeterminate structures .......................................................................................................................... 275 18.11—Compression members—Combined flexure and axial loads .................................................................................. 276 18.12—Slab systems........................................................................................................................................................... 276 18.13—Post-tensioned tendon anchorage zones ............................................................................................................... 278 18.14—Design of anchorage zones for monostrand or single 16 mm diameter bar tendons ............................................. 283 18.15—Design of anchorage zones for multistrand tendons........................................................................................................284 18.16—Corrosion protection for unbonded tendons.....................................................................................................................284 18.17—Post-tensioning ducts.............................................................................................................................................. 285 18.18—Grout for bonded tendons ....................................................................................................................................... 285 18.19—Protection for prestressing steel ............................................................................................................................. 286 18.20—Application and measurement of prestressing force............................................................................................... 287 18.21—Post-tensioning anchorages and couplers.............................................................................................................. 287 18.22—External post-tensioning ......................................................................................................................................... 288 CHAPTER 19—SHELLS AND FOLDED PLATE MEMBERS............................................................. 291 19.1—Scope and definitions................................................................................................................................................ 291 19.2—Analysis and design .................................................................................................................................................. 293 19.3—Design strength of materials ..................................................................................................................................... 295 19.4—Shell reinforcement ................................................................................................................................................... 295 19.5—Construction.............................................................................................................................................................. 297 CHAPTER 20—STRENGTH EVALUATION OF EXISTING STRUCTURES ...................................... 299 20.1—Strength evaluation—General................................................................................................................................... 299 20.2—Determination of required dimensions and material properties ................................................................................ 300 20.3—Load test procedure .................................................................................................................................................. 301 20.4—Loading criteria ......................................................................................................................................................... 301 20.5—Acceptance criteria ................................................................................................................................................... 302 20.6—Provision for lower load rating................................................................................................................................... 304 20.7—Safety........................................................................................................................................................................ 304 CHAPTER 21—SPECIAL PROVISIONS FOR SEISMIC DESIGN...................................................... 305 21.1—Definitions ................................................................................................................................................................. 305 21.2—General requirements ............................................................................................................................................... 307 21.3—Flexural members of special moment frames ........................................................................................................... 312 Copyright American Concrete Institute Provided by IHS under license with ACI Licensee=Black & Veatch/5910842100 No reproduction or networking permitted without license from IHS Not for Resale, 11/28/2005 18:20:15 MST --`,,`,````````,,`,,`,,``,`,,,`-`-`,,`,,`,`,,`---