Title: Curved Strut and Tie Recognition in Reinforced Concrete Elliptical Deep Beams

Author(s): Khattab Saleem Abdul-Razzaq, Baidaa N. Hasan and Asala A. Dawood

Publication: Structural Journal

Volume:

Issue:

Appears on pages(s):

Keywords: elliptical ring deep beams; flexural reinforcement; proposed mathematical model; reinforced concrete; strut-and-tie method; web reinforcement

DOI: 10.14359/51742152

Date: 8/5/2024

Abstract:
Elliptical deep beams have a peculiarity, which is that the compression paths (struts) are neither straight nor symmetrical within the same span. The asymmetrical horizontal curvature in one span leads to the formation of asymmetrical torsional moments. The strut-and-tie-method (STM), approved by the ACI 318-19 and most international codes, does not take into consideration the curvature of the strut and the consequent bending and torsional moments. Therefore, eight deep elliptical specimens were cast and reinforced with variable amounts of web and flexural reinforcement in order to study the role importance of each one of them experimentally and theoretically from the STM point of view. Only the stress paths were cast and reinforced in two other specimens in order to study STM in detail on the one hand, and on the other hand, to present alternative specimens to the reference ones with less weight and cost, in addition to providing openings for services. STM has proven its effectiveness with asymmetrical horizontally curved deep beams due to its ease and the high safety it provides. STM development has also been presented here by adding the effect of the horizontal curvature.