Cyclic behaviour of as-built and strengthened existing reinforced concrete columns previously damaged by fire

Melo, José; Triantafyllidis, Zafiris; Rush, David; Bisby, Luke; Rossetto, Tiziana; Arêde, António; Varum, H.; Ιωάννου, Ιωάννα

doi:10.1016/j.engstruct.2022.114584

Cited by 13 publications

(3 citation statements)

References 41 publications

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“…This simulation incorporated a fire-exposed temperature field model and a structural mechanics calculation model for the post-fire scenario. References [32][33][34] presented experimental research on the seismic performance of structures post-fire when strengthened with CFRP. These studies consistently demonstrated improvements in the bearing capacity and ductility of joints, a more robust hysteresis curve, enhanced deformation capacity, and slower degradation of strength and stiffness after reaching the ultimate load, following reinforcement.…”

Section: Discussionmentioning

confidence: 99%

Post-Fire Seismic Property of Reinforced Concrete Frame Joints with Carbon Fiber-Reinforced Polymer Using Numerical Analysis

Wang

Yue

et al. 2023

Fire

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This study investigated the post-fire seismic characteristics of reinforced concrete frame joints with carbon fiber-reinforced polymer (CFRP) under low-cycle reciprocating loads through numerical analysis. Finite element simulations were conducted to examine the hysteretic curve, skeleton curve, energy dissipation, and stress distribution of the reinforced joints. The findings revealed that, relative to unreinforced joints post-fire, the bearing capacity of the reinforced joints remained essentially unaltered during the elastic phase. However, their ultimate bearing capacity, energy dissipation capacity, and ductility exhibited varying degrees of enhancement. Interestingly, this augmentation did not persist as the number of reinforcement layers increased. The optimal reinforcing effect was observed with the application of two reinforcement layers, resulting in a 30.3% increase in ultimate bearing capacity and a 26.5% improvement in energy dissipation capacity. Moreover, as the axial compression ratio increased, the high-stress zones within the joint expanded, and the failure mode transitioned from plastic damage at the beam end of the joint under low axial compression ratios to column crushing failure under high axial compression ratios.

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Section: Discussionmentioning

confidence: 99%

Post-Fire Seismic Property of Reinforced Concrete Frame Joints with Carbon Fiber-Reinforced Polymer Using Numerical Analysis

Wang

Yue

et al. 2023

Fire

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“…The strengthening process restored the structure's loadbearing capability, strengthened the concrete, and improved its serviceability for its remaining service life. Strengthening technologies that repair or increase fire resistance of heatdamaged reinforced concrete (RC) elements must also be developed and validated [4]. The research on strengthening technique reliability is a task to be developed based on durability and technical advancements.…”

Section: Introduction 11 Backgroundmentioning

confidence: 99%

Post-Fire Behavior and Repair of Fire-Damaged RC Columns Using Composite Jackets

Belakhdar,

Dimia,

Baghdadi

et al. 2023

ACSM

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Reinforced concrete (RC) structures are frequently employed in construction owing to their versatility, strength, and durability. However, these structures can be vulnerable to fire incidents, which can significantly compromise their structural integrity and loadcarrying capacity. In the aftermath of a fire, damaged RC columns often necessitate rehabilitation to restore their strength and functionality. The present study intends to carry out a numerical investigation of the behavior of reinforced concrete (RC) columns after their exposure to fire. As a first step, the study examined the effects of exposing the columns to fire for different periods (15, 30, 60 and 90 minutes) on the column's residual load-bearing capacity by considering some decisive geometrical parameters such as the column height and its cross-sectional area. The second step consisted of investigating the effectiveness of the strengthening techniques utilized by adding reinforcement and incorporating composite jackets, where each method used three external concrete compressive strength values, 25, 30, and 40 MPa, in order to improve the post-fire behavior of these columns. The results showed that the longer the column is exposed to fire, the lower its bearing capacity. However, it was also found that increasing the column cross-sectional area can reduce the percentage of load-bearing capacity. Moreover, A simple equation with sufficient accuracy has been proposed to predict the bearing capacity of reinforced columns. Finally, it was revealed that the strengthening methods used herein allowed restoring the capacity of the columns exposed to fire, but the strengthening technique using a composite jacket with steel plates showed better results in terms of strength. Where this technique allowed, it restored the capacity of the columns exposed to fire for a period of one hour by up to 182%.

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“…Repairing the structure restored its load-bearing capability, strengthened the concrete, and improved its serviceability for its remaining service life. Developing and verifying strengthening techniques to repair or increase the fire resistance of heat-damaged reinforced concrete (RC) components is critical (Melo et al, 2022). The research on strengthening technique reliability is a task to be developed based on durability and technical advancements.…”

Section: Introduction 11 Backgroundmentioning

confidence: 99%

Post-fire behavior of RC columns repaired with square hollow section steel tube and RC concrete jackets

Belakhdar,

Dimia,

Baghdadi

2023

J. Eng. Exact Sci.

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This paper investigates numerically fire-exposed reinforced concrete (RC) columns. As a first step, the study examined the effects of exposing the columns to fire for 60 minutes according to the ISO 834 fire standard on the column's residual load-bearing capacity by considering some decisive geometrical parameters such as the column height and its cross-sectional area. The second step consisted of investigating the effectiveness of the strengthening technique utilized by incorporating composite jackets, considering different strengths of concrete, in order to improve the post-fire behavior of these columns. The results showed that the longer the column is exposed to fire, the lower its bearing capacity. However, it was also found that increasing the column cross-sectional area can reduce the percentage of load-bearing capacity. Finally, it was revealed that the strengthening method used herein allowed restoring the capacity of the columns exposed to fire for a period of one hour by up to 180%.

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Cyclic behaviour of as-built and strengthened existing reinforced concrete columns previously damaged by fire

Cited by 13 publications

References 41 publications

Post-Fire Seismic Property of Reinforced Concrete Frame Joints with Carbon Fiber-Reinforced Polymer Using Numerical Analysis

Post-Fire Seismic Property of Reinforced Concrete Frame Joints with Carbon Fiber-Reinforced Polymer Using Numerical Analysis

Post-Fire Behavior and Repair of Fire-Damaged RC Columns Using Composite Jackets

Post-fire behavior of RC columns repaired with square hollow section steel tube and RC concrete jackets

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