Title:
Behavior of Headed and Hooked Reinforcement Anchored in Beam-Column Knee Joints
Author(s):
Skillen
Publication:
Web Session
Volume:
ws_F23_Skillen.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/29/2023
Abstract:
The usefulness of reinforced concrete relies on sufficient anchorage between concrete and steel. Sufficient anchorage occurs when reinforcing steel is embedded into the concrete a distance called the development length. When this embedment length is achieved the reinforcing steel is expected to reach or exceed stresses beyond yield. Geometric constraints within structural members may prevent straight lengths of reinforcement from developing their yield strength, such as straight bars terminated within a beam-column joint. Therefore, the addition of a hook or headed bar attachment provides a more efficient anchorage mechanism compared to straight bars. Yet, group effects (multiple reinforcement layers being developed simultaneously), bar stress gradients, and the interaction between hooked and headed reinforcement on joint strength and deformability are not fully understood. Full-scale testing of large beam-column joints are currently underway to further understand these phenomena.