Title: Curved-Bar Nodes

Author(s): Gary J. Klein

Publication: Concrete International

Volume: 30

Issue: 9

Appears on pages(s): 42-47

Keywords: D-region; detailing; standard hook; nodal zone; strut-and-tie model

DOI:

Date: 9/1/2008

Abstract:
In reinforced concrete design, there are numerous examples where bent bars at the outside of a frame corner resist closing moments, such as beam-column and wall-slab junctions. The forces in these corners can be modeled using strut-and-tie models. In this article, a new modeling technique where a single node is used to model the curved region of the bar is presented. Specific recommendations for design and detailing using strut-and-tie models with curved-bar nodes in frame corners and dapped-end beams are offered. Complete sample calculations are provided in an attachment to the electronic version of this article.