Title:
ACI 318-99 Provisions for Seismic Design of Structural Walls
Author(s):
John W. Wallace and Kutay Orakcal
Publication:
Structural Journal
Volume:
99
Issue:
4
Appears on pages(s):
499-508
Keywords:
design; reinforced concrete; shear; wall
DOI:
10.14359/12119
Date:
7/1/2002
Abstract:
New provisions for evaluating flexural strength and detailing requirements at boundaries of reinforced concrete structural walls were incorporated into the 1999 version of the American Concrete Institute (ACI) Building Code, ACI 318-99. The ACI 318-99 provisions apply to both slender and stout walls, and walls with openings. The moment capacity of wall cross sections is based on a strain compatibility analysis, and two approaches are provided to determine whether specially detailed boundary elements are required. The first approach can be applied to all wall sections and involves checking a 0.2 fc¢ stress limit at the wall boundary for code- specified loads. Although the stress limit is the same as that in ACI 318-95, significant changes were incorporated to address commonly identified shortcomings associated with the ACI 318-95 provisions. For the second approach, once the critical section along the wall height is identified, a simplified displacement-based design procedure is used to assess whether special detailing is needed. Background and illustrative examples are presented to demonstrate important concepts and appropriate use.