Torsional Behavior in Reinforced Concrete Structures

Torsion refers to the twisting of structural elements under applied torque, inducing shear stresses and warping. In reinforced concrete members, longitudinal reinforcement and transverse links or stirrups form a space-truss mechanism that engages with the tensile capacity of the concrete to resist torsion. Cracking typically initiates along inclined planes at low torque levels and evolves into a network of cracks that localise strains, often leading to abrupt stiffness loss. Design codes stipulate minimum reinforcement ratios to ensure ductility and control crack widths, yet innovations in high-strength and ultra-high-performance concrete have enabled slender sections with reduced ductility, challenging traditional models. Experimental methods such as digital image correlation and refined finite-element analyses have shed light on strain localisation, debonding at joints and complex interactions between reinforcement and concrete. The inclusion of web openings, fibre reinforcement and bonded composite wraps has broadened strategies for enhancing torsional capacity. Reliable prediction and control of torsional behaviour are essential for infrastructure—from highway overpasses to offshore platforms—where combined loading and fatigue demand accurate analytical models, robust experimental validation and, increasingly, machine learning tools to capture the multifaceted response of reinforced concrete under torsion.

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Torsional Behavior in Reinforced Concrete Structures publication trend

The graph below shows the total number of articles in torsional behavior in reinforced concrete structures across all publications each year (not limited to Nature Index journals).

Technical terms

Torsion: Twisting action on a member caused by applied torque, resulting in shear stresses and warping.

Angle of twist: Rotation per unit length of a member under torsion.

Cracking torque: Applied torque at which the first visible crack appears.

Torsional strength: Maximum torque a section can resist before failure.

Ultra-high-performance fibre-reinforced concrete (UHPFRC): Concrete with very high compressive strength and enhanced ductility provided by fine powders and fibres.

Self-compacted concrete (SCC): Highly flowable concrete that consolidates under its own weight without mechanical vibration.

Epoxy-bonded joint: Adhesive interface between concrete elements used to transfer shear and torsional stresses across a joint.

References

1. Effectiveness of flange plates on torsional behaviors of ultra-high-performance fiber-reinforced concrete hollow beams. Developments in the Built Environment (2023).
2. Flat-face epoxy-bonded concrete joints loaded in torsion: Physical modelling. Construction and Building Materials (2024).
3. Effect of Openings on the Torsional Behavior of SCC Box Beams Under Monotonic and Repeated Loading. Civil Engineering Journal (2023).