This document applies to structures in regions of high seismic risk or to
structures assigned to high seismic performance or design categories. It
defines the minimum experimental evidence that can be deemed to satisfy
the use of unbonded post-tensioned precast structural walls (shear walls)
for bearing wall and building frame special reinforced concrete shear wall
systems, as defined in ASCE/SEI 7-05, when those walls do not fully satisfy
the intent of the prescriptive requirements of Chapter 21 of ACI 318-05.
This document includes mandatory Acceptance Criteria and nonmandatory
Commentary, and has been written in such a form that its requirements can
be coordinated directly with the requirements for special precast structural
walls in 21.8 of ACI 318-05. Among the subjects covered are requirements
for the procedures that shall be used to design unbonded post-tensioned
precast test modules and their configurations, as well as requirements for
testing, reporting, and assessing satisfactory performance of the test modules.
The references of the Commentary provide documentary evidence,
additional to the references of Chapter 21 of ACI 318R-05, that support the
acceptance criteria. Consistent with the approach of ACI 318, no comparison
is made, either in the body of the Acceptance Criteria or Commentary, of
research results for precast test modules satisfying ACI 318 with those for
modules that, although not satisfying ACI 318, do satisfy the Acceptance
Criteria. Such comparisons, both experimental and analytical, are available in
the Commentary references.
In this document, consistent with the format of ACI 318-05, the word
“Section” is not included before a reference to a section of ACI 318-05. To
more clearly designate a section in this document, however, the word
“Section” is used before any reference to a section of this document.
The section numbering for the Commentary is the same as that for the
Standard, with numbers preceded by an “R” and the text in italics to distinguish
them from the corresponding section numbers of the Standard.
ACI ITG-5.1-2007 Referenced Document
ACI 318-2005 Building Code Requirements for Structural Concrete(ACI 318-05) and Commentary(ACI 318R-05)*, 2024-04-19 Update
ACI T1.1 Acceptance Criteria for Moment Frames Based on Structural Testing