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(searched for: doi:10.1016/j.engstruct.2021.111978)
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, Pengkun Gao, , Muhammad Sufian, Hisham Alabduljabbar
Published: 17 December 2021
Case Studies in Construction Materials, Volume 16; https://doi.org/10.1016/j.cscm.2021.e00843

Abstract:
The provision of appropriate fire-safety measures is a basic need in building design to guarantee the safety of its occupants. Damage due to fire is one of the most destructive aspects that cause deterioration of reinforced concrete structures. Although concrete is a noncombustible material, its physical, chemical, and mechanical characteristics degrade if exposed to a high temperature. The seriousness of a fire in concrete structures is mostly determined by the magnitude and duration of the fire. If the magnitude of fire is minor and for a limited time then the damage to the concrete members is likely to be minimal. Similarly, a higher magnitude or high temperature with a longer duration will cause maximum damage or may result in the collapse of concrete structures. The purpose of this review is to summarize the damage of reinforced concrete (RC) structures after a severe occurrence of fire. Additionally, to discuss the firefighting deficiencies, and remedial measures adopted for recovering the damage due to fire in high-rise buildings. The current study is a review of previous studies from the last decade on important fire damage assessment measures used for damage assessment of RC structures. Some case studies have also been reported in this work. The review results show the popularity of surveys and case studies on fire damage related to RC structures. The essential contributing factors are collected that correspond to the damage of RC structures due to fire. The electrical problems, faulty fire detection systems, and a lack of firefighting equipment, and obstacles in emergency exits were shown to be the most frequent causes of fire damage.
Abhishek Verma, Jagdeep Singh Gahir
IOP Conference Series: Earth and Environmental Science, Volume 889; https://doi.org/10.1088/1755-1315/889/1/012073

Abstract:
This research paper describes the properties of electromagnetism of concrete mix that are sustained to make “Electrically Conductive Concrete”. Thus, the values provide various information on the behaviour of concrete mix and its relation with electromagnetic waves. Steel Fiber and Graphite are conductive materials. The properties of conductive concrete mix that is coarse aggregates, sand and cement can be measured. In the physical significance, the data calculated in X-ray diffraction and Scanning Electronic Microscope was discussed. The contact between the Steel Fiber and graphite is improved to make electrically conductive concrete. The strength is gained continuously till 3% where the maximum strength is gained which is 9.77% higher than the strength achieved by controlled sample. The control sample achieved 26.60MPa, with addition of 1% steel fibers the concrete achieved 29.40MPa, further increase in steel fiber content to 2% gained higher strength of 30.50MPa. The maximum compressive strength of 31.50MPa was achieved with the addition of 3% steel fibers. Further increase in steel fiber content resulted in decrease in strength, though 4% steel fiber reinforced concrete achieved 30.70MPa
, , Francisco J. Pallarés, Pedro A. Calderón, Jose M. Adam
Published: 14 October 2021
Journal of Building Engineering, Volume 45; https://doi.org/10.1016/j.jobe.2021.103445

Abstract:
Column strengthening is a very common practice for improving the seismic performance of reinforced concrete frame structures or repairing damage after a seismic event. Several methods are employed for column strengthening, which can improve column strength by preventing its shear, bending or compression failure. However, not all methods allow column strengthening connections between adjacent floors, thus the beam-column joint strength could be limited by the column-joint interface capacity. This work aimed to analyse two joint strengthening designs, for which an experimental campaign of eight full-scale beam-column joints strengthened with steel caging, and subjected to cyclic and gravity loads, was carried out. As access to joint panels is very complex in existing structures, joint strengthening consists of external solutions: vertical or diagonal bars and capitals connecting columns. The results showed that these techniques significantly increased beam-column joint strength and highlighted that failure can be undesirably transferred to the joint. Vertical bars prevented the bending failure of the column-joint interface, but failure occurred at the joint in this study. Diagonal bars can also prevent joint failure.
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