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.