Building Code Requirements for Structural Concrete and Commentary

TABLE OF CONTENTS
5
ACI 318 Building Code and Commentary
16.7—Items embedded after concrete placement ...............................................................................................................275
16.8—Marking and identification..........................................................................................................................................275
16.9—Handling ....................................................................................................................................................................275
16.10—Strength evaluation of precast construction ............................................................................................................275
CHAPTER 17—COMPOSITE CONCRETE FLEXURAL MEMBERS.................................................. 277
17.1—Scope ........................................................................................................................................................................277
17.2—General......................................................................................................................................................................277
17.3—Shoring ......................................................................................................................................................................278
17.4—Vertical shear strength...............................................................................................................................................278
17.5—Horizontal shear strength ..........................................................................................................................................278
17.6—Ties for horizontal shear ............................................................................................................................................279
CHAPTER 18—PRESTRESSED CONCRETE .................................................................................... 281
18.1—Scope ........................................................................................................................................................................281
18.2—General......................................................................................................................................................................282
18.3—Design assumptions ..................................................................................................................................................283
18.4—Serviceability requirements—Flexural members .......................................................................................................284
18.5—Permissible stresses in prestressing steel.................................................................................................................287
18.6—Loss of prestress .......................................................................................................................................................287
18.7—Flexural strength........................................................................................................................................................289
18.8—Limits for reinforcement of flexural members ............................................................................................................290
18.9—Minimum bonded reinforcement ................................................................................................................................291
18.10—Statically indeterminate structures...........................................................................................................................293
18.11—Compression members—Combined flexure and axial loads...................................................................................294
18.12—Slab systems ...........................................................................................................................................................294
18.13—Post-tensioned tendon anchorage zones ................................................................................................................297
18.14—Design of anchorage zones for monostrand or single 5/8 in. diameter bar tendons ...............................................302
18.15—Design of anchorage zones for multistrand tendons ...............................................................................................303
18.16—Corrosion protection for unbonded tendons ............................................................................................................304
18.17—Post-tensioning ducts ..............................................................................................................................................304
18.18—Grout for bonded tendons........................................................................................................................................304
18.19—Protection for prestressing steel ..............................................................................................................................306
18.20—Application and measurement of prestressing force ...............................................................................................306
18.21—Post-tensioning anchorages and couplers ..............................................................................................................307
18.22—External post-tensioning ..........................................................................................................................................308