Numerical comparison of the effect of circular and square stirrups onreinforced concrete beams

Proceedings of 3rd International Civil Engineering and Architecture Congress (ICEARC’23), Trabzon, Türkiye, 12 - 14 Ekim 2023, ss.1333-1351

Purpose: In reinforced concrete rectangular beams, finite element models were created by arranging the geometric

configuration of stirrups as circular and rectangular and comparing the bending test results.

Study design/methodology/approach: Reinforced concrete beam samples were analyzed in the Abaqus finite element

program. CDP (Concrete Damage Plasticity) was used as the material model. Dynamic/Explicit was applied as the

analysis method. Four-point bending tests were carried out in which the simply supported beam stirrup model was

arranged as rectangular and circular.

Findings: When the analysis results are evaluated, it is determined that beams with coincide circular stirrup

arrangement, having approximately the same amount of reinforcement by weight, have a 15-20% higher load capacity

compared to beams with a traditional rectangular stirrup arrangement. In the case of discrete circular stirrup beams, the

capacity is 5-10% higher compared to beams with traditional rectangular stirrups. Additionally, it is determined that

energy dissipation capacities are approximately 20% higher in the linear region. Beams with a discrete circular stirrup

arrangement, which are less in weight, have approximately the same bearing capacity as classical rectangular stirrup

beams.

Originality/value: As a result, the use of circular stirrups gave more positive results in terms of deflection, load and

energy consumption capacity compared to rectangular stirrup beams. It is determined that reinforcement stresses

increased in circular stirrups under bending test. Since the use of circular stirrups will achieve the same load capacity

with less reinforcement, the use of stirrups in this geometry will also contribute economically