ACI 550.6-19 (IN-LB) PDF Download

ACI 550.6-19 (IN-LB) is a standard that specifically applies to structures located in high seismic risk regions or those assigned to high seismic performance or design categories. It provides guidelines for the use of unbonded post-tensioned precast structural walls (shear walls) when they do not fully meet the requirements of Chapter 18 of ACI 318-14, which is the standard for building code requirements for structural concrete.

The standard includes both mandatory acceptance criteria and non-mandatory commentary. These acceptance criteria define the minimum experimental evidence that is considered satisfactory for the use of unbonded post-tensioned precast structural walls. The standard also specifies the procedures for designing the test modules and their configurations, as well as requirements for testing, reporting, and assessing the performance of the test modules.

The commentary provided in this standard serves as additional documentation and supports the acceptance criteria. It provides references to research results for precast test modules that satisfy ACI 318 as well as those that, although not satisfying ACI 318, still meet the acceptance criteria. These comparisons and additional information can be found in the references provided in the commentary.

The format of ACI 550.6-19 (IN-LB) follows the format of ACI 318-14, but it includes the word "Section" before any reference to a section of this standard to avoid confusion. The section numbering for the commentary is consistent with the standard, with numbers preceded by an "R" and the text in italics to differentiate them from the corresponding sections of the standard.