Title: Delamination Cracking Behavior of Curved Post-Tensioned Concrete Structures

Author(s): Jongkwon Choi, Clint R. Woods, Trevor D. Hrynyk, and Oguzhan Bayrak

Publication: Structural Journal

Volume: 117

Issue: 3

Appears on pages(s): 169-183

Keywords: aggregate size; curved structures; cylindrical structures; delamination; design guideline; nuclear containment structure; prestressed concrete; size effect

DOI: 10.14359/51723498

Date: 5/1/2020

Abstract:
To investigate the underlying mechanisms of delamination cracking behavior in cylindrical post-tensioned concrete structures, three quarter-circle post-tensioned concrete wall assemblies were constructed and tested to delamination failure under monotonically increasing prestressing loads. The two main testing variables comprising the experimental program were specimen size (wall height, wall thickness, and cylinder radius) and the maximum nominal aggregate size. To compare the test results obtained, a size parameter, which represents the relative size of the wall specimen with respect to the maximum concrete aggregate size, was employed and found that characteristics of wall delamination responses were highly correlated with the specimen size parameter. The idealized through thickness and vertical responses proposed in this paper could be used as a guideline for the design, evaluation, repair, and strengthening of cylindrical post-tensioned concrete structures.