Title:
Designing for Construction Productivity and Safety
Author(s):
Gordon H. Reigstad, Jason G. Reigstad, and Jared M. Reigstad
Publication:
Concrete International
Volume:
43
Issue:
6
Appears on pages(s):
51-55
Keywords:
design, formwork, shoring, pour strip
DOI:
10.14359/51732872
Date:
6/1/2021
Abstract:
Volume change is a challenging aspect of reinforced concrete and post-tensioned construction. If no measures are taken to minimize restraint to shortening from columns, braced frames, moment frames, and shear walls, strains resulting from concrete shrinkage, creep, temperature, and elastic shortening associated with post-tensioning can result in high tensile stresses and significant cracking. In an elevated slab, the common solution is to use a pour strip. An innovative pour strip design based on the use of mechanical couplers is discussed.
Related References:
1. Allred, B., “Issues in Post-Tensioned Construction,” Concrete Construction, Jan. 2006, www.concreteconstruction.net/how-to/construction/issues-in-post-tensioned-construction_o.
2. ACI Committee 347, “Guide to Formwork for Concrete (ACI 347R-14),” American Concrete Institute, Farmington Hills, MI, 2014, 36 pp.
3. ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-19) and Commentary (ACI 318R-19),” American Concrete Institute, Farmington Hills, MI, 2019, 623 pp.
4. Bordner Tanck, M., “Pour Strips and Constructability,” Structure Magazine, Apr. 2014, pp. 46-47.
5. ICC-Evaluation Report ESR-4213, “PS=Ø Steel Reinforcement Splice System for Steel Reinforcing Bars,” ICC-Evaluation Service, LLC, Country Club Hills, IL, USA, Mar. 2019, 6 pp.