Acceptance Criteria for Special Unbonded Post- Tensioned Precast Structural Walls Based on Validation Testing and Commentary - Inch-Pound Units (IN-LB)

Abstract

Scope and general requirements

While only ACI Committee 318 can specify the requirements necessary for unbonded post-tensioned precast walls to meet the provisions of 18.2.1.7 of ACI 318, 1.10 of ACI 318 permits the building official to accept precast wall systems, other than those explicitly covered by Chapter 18 of ACI 318, provided specific tests, load factors, deflection limits, construction procedures, and other pertinent requirements have been established for acceptance of such systems consistent with the intent of the Code.

This document provides a framework that establishes the specific tests, load factors, deflection limits, and other pertinent requirements appropriate for acceptance for regions of high seismic risk or for structures assigned to high seismic performance or design categories of unbonded post-tensioned precast wall systems, including unbonded post-tensioned precast coupled wall systems, not satisfying all the prescriptive requirements of Chapter 18 of ACI 318.

This document assumes that the unbonded post-tensioned precast wall system to be tested has details that differ from those prescribed by 18.10 of ACI 318 for conventional monolithic reinforced concrete construction