FARMINGTON HILLS, MICH. — The American Concrete Institute (ACI) has announced the opening of public discussion for ACI 318 — Building Code Requirements for Structural Concrete and Commentary.
ACI Committee 318, Structural Concrete Building Code, has almost completed its work on the latest edition of the Code, ACI 318-11, Building Code Requirements for Structural Concrete and Commentary.
As part of its activities at the ACI Fall 2010 Convention in Pittsburgh, Pa. in October, Committee 318 provided responses to comments from the ACI Technical Activities Committee (TAC) on the ACI 318-11 draft. TAC has since approved the responses, and in accordance with ACI’s standardization procedures, the draft is now available for public review for a 45-day period.
Some of the changes include:
• Design requirements for adhesive anchors are now included. Failure modes and corresponding nominal strengths are defined, as are requirements for testing and evaluation of adhesive anchors for use in cracked concrete or subject to sustained loads. The new provisions also include criteria for overhead adhesive anchors, seismic requirements for anchoring to concrete, installation and inspection of adhesive anchors, and certification of adhesive anchor installers;
• Reinforcement detailing requirements for seismic applications have been enhanced. These enhancements include rules for identifying and detailing distinct segments of a special structural wall, detailing of horizontal bars at special boundary elements, and confinement of beam flexural hinge regions;
• New test methods for sulfate resistance are included. ASTM D516 and D4130 are identified tests for sulfate ions in water, brackish water, or seawater; and ASTM C1580 is identified as a test for water-soluble sulfate in soil;
• New deformed bars are included. Grade 80 deformed bars per ASTM A615 and A706 are allowed for non-seismic applications. Zinc and epoxy dual-coated reinforcing bars per ASTM A1055 are also now allowed;
• Test records for determining standard deviation for mixture design may now be up to 24 months old. Also, testing agencies performing acceptance testing concrete are now required to comply with ASTM C1077;
• New requirements for detailing of circular column ties, design and detailing of temperature and shrinkage reinforcement for post-tensioned slabs, and minimum reinforcement for deep beams have been added. Also, development length for headed bars has been revised; and
• Factored load combinations have been revised to conform with ASCE 7-10.
Interested parties are invited to read and provide comments no later than Jan. 17, 2011. The draft can be downloaded at www.concrete.org/pubs/standaction.asp.