The code portion of this document covers the design and construction of structural concrete used in buildings and where applicable in nonbuilding structures.Among the subjects covered are: drawings and specifications; inspection; materials; durability requirements; concrete quality, mixing and placing; formwork; embedded pipes; construction joints; reinforcement details; analysis and design; strength and serviceability; flexural and axial loads; shear and torsion; development and splices of reinforcement; slab systems; walls; footings; precast concrete; composite flexural members; prestressed concrete; shells and folded plate members; strength evaluation of existing structures; special provisions for seismic design; structural plain concrete; strut-and-tie modeling in Appendix A;... alternative design provisions in Appendix B; alternative load and strength-reduction factors in Appendix C; and anchoring to concrete in Appendix D.The quality and testing of materials used in construction are covered by reference to the appropriate ASTM standard specifications. Welding of reinforcement is covered by reference to the appropriate ANSI/AWS standard.Uses of the code include adoption by reference in general building codes, and earlier editions have been widely used in this manner. The code is written in a format that allows such reference without change to its language. Therefore, background details or suggestions for carrying out the requirements or intent of the code portion cannot be included. The commentary is provided for this purpose. Some of the considerations of the committee in developing the code portion are discussed within the commentary, with emphasis given to the explanation of new or revised provisions. Much of the research data referenced in preparing the code is cited for the user desiring to study individual questions in greater detail. Other documents that provide suggestions for carrying out the requirements of the code are also cited.Keywords: admixtures; aggregates; anchorage (structural); beam-column frame; beams (supports); building codes; cements; cold weather construction; columns (supports); combined stress; composite construction (concrete and steel); composite construction (concrete to concrete); compressive strength; concrete construction; concretes; concrete slabs; construction joints; continuity (structural); contraction joints; cover; curing; deep beams; deflections; drawings; earth-quake resistant structures; embedded service ducts; flexural strength; floors; folded plates; footings; formwork (construction); frames; hot weather construction; inspection; isolation joints; joints (junctions); joists; lightweight concretes; loads (forces); load tests (structural); materials; mixing; mix proportioning; modulus of elasticity; moments; pipe columns; pipes (tubing); placing; plain concrete; precast concrete; prestressed concrete; prestressing steels; quality control; reinforced concrete; reinforcing steels; roofs; serviceability; shear strength; shearwalls; shells (structural forms); spans; specifications; splicing; strength; strength analysis; stresses; structural analysis; structural concrete; structural design; structural integrity; T-beams; torsion; walls; water; welded wire reinforcement.*****************************************PCA Notes on 318Editors: M.E. Kamara and B.G. RabbatThis ninth edition of PCA Notes has been updated to reflect code changes introduced in the latest version of Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (318R-05). The 34 chapters of PCA Notes incorporate the new notation and terminology. An alternative torsion design method is presented. Enhanced provisions for the design of anchors are described, and their application illustrated through several examples. Each chapter of PCA Notes starts with a description of the latest code changes. Emphasis is placed on "how to use" the code. Numerous design examples illustrate application of the code provisions. The primary purpose of the PCA Notes is to assist the engineer and architect in the proper application of the ACI 318-05 design standard. This publication is also a valuable aid for educators, undergraduate and graduate students, contractors, materials and product manufacturers, building code authorities, and inspectors.