Fire Resistance of Reinforced Concrete Structures

Reinforced concrete structures combine the compressive strength of concrete with the tensile capacity of steel reinforcement, offering durable and economical solutions for buildings, bridges and infrastructure. Under fire exposure, the performance of these elements is governed by the interaction of heat transfer, material degradation and structural response. Concrete provides inherent fire resistance by acting as a thermal cushion and delaying heat penetration, while the concrete cover shields the steel from rapid temperature rises. However, elevated temperatures induce spalling, reduction of concrete strength, loss of bond between steel and concrete, and softening of reinforcement, all of which compromise load-bearing capacity. The severity of these effects depends on fire exposure time, peak temperature, moisture content and cross-sectional geometry. Contemporary research has focused on experimental assessment of residual strength, advanced numerical modelling of thermal-mechanical behaviour, development of novel insulating materials and fibre-reinforced overlays for retrofit. Predictive tools, including finite element analysis and data-driven algorithms, enable performance-based design and post-fire evaluation to ensure life-safety and structural integrity. Global standards and engineering codes have progressively incorporated performance criteria and material-specific properties under high temperatures, reflecting growing concern for resilience in extreme fire scenarios. Innovative repair techniques and improved understanding of bond-slip deterioration further enhance the capacity to rehabilitate fire-damaged elements, thereby extending service life and mitigating economic loss.

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Fire Resistance of Reinforced Concrete Structures publication trend

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

Technical terms

Spalling: The explosive detachment of concrete layers due to internal pore pressure and thermal stresses during fire exposure.

Residual strength: The remaining load-bearing capacity of concrete or reinforcement after exposure to elevated temperatures.

Bond-slip relationship: The interfacial behaviour between steel reinforcement and concrete matrix, characterised by relative displacement under load.

Finite element analysis: A computational technique that subdivides structures into discrete elements to simulate thermal and mechanical response under fire conditions.

References

1. Structural performance of fire-damaged concrete beams retrofitted using bamboo fiber laminates. Results in Engineering (2024).
2. Soft computing models for assessing bond performance of reinforcing bars in concrete at high temperatures. Innovative Infrastructure Solutions (2023).
3. Finite Element Analysis and Calculation Method of Residual Flexural Capacity of Post-fire RC Beams. International Journal of Concrete Structures and Materials (2020).