TY - JOUR
T1 - Post-fire Repair of Concrete Structural Members:A Review on Fire Conditions and Recovered Performance
AU - Qiu, Jin
AU - Jiang, Liming
AU - Usmani, Asif
N1 - Funding Information:
The research is supported by the Start-up Fund of the Hong Kong Polytechnic University (P0031564). The financial support is gratefully acknowledged.
Publisher Copyright:
© 2021, International Journal of High-Rise Buildings. All rights reserved.
PY - 2021/12
Y1 - 2021/12
N2 - Concrete structures may rarely collapse in fire incidents but fire induced damage to structural members is inevitable as a result of material degradation and thermal expansion. This requires certain repairing measures to be applied to restore the performance of post-fire members. A brief review on investigation of post-fire damage of concrete material and concrete structural members is presented in this paper, followed by a review of post-fire repair research regarding various types of repairing techniques (FRP, steel plate, and concrete section enlargement) and different type of structural members including columns, beams, and slabs. Particularly, the fire scenarios adopted in these studies leading to damage are categorized as three levels according to the duration of gas-phase temperature above 600oC (t600). The repair effectiveness in terms of recovered performance of concrete structural members compared to the initial undamaged performance has been summarized and compared regarding the repairing techniques and fire intensity levels. The complied results have shown that recovering the ultimate strength is achievable but the stiffness recovery is difficult. Moreover, the current fire loading scenarios adopted in the post-fire repair research are mostly idealized as constant heating rates or standard fire curves, which may have produced unrealistic fire damage patterns and the associated repairing techniques may be not practical. For future studies, the realistic fire impact and the system-level structural damage investigation are necessary.
AB - Concrete structures may rarely collapse in fire incidents but fire induced damage to structural members is inevitable as a result of material degradation and thermal expansion. This requires certain repairing measures to be applied to restore the performance of post-fire members. A brief review on investigation of post-fire damage of concrete material and concrete structural members is presented in this paper, followed by a review of post-fire repair research regarding various types of repairing techniques (FRP, steel plate, and concrete section enlargement) and different type of structural members including columns, beams, and slabs. Particularly, the fire scenarios adopted in these studies leading to damage are categorized as three levels according to the duration of gas-phase temperature above 600oC (t600). The repair effectiveness in terms of recovered performance of concrete structural members compared to the initial undamaged performance has been summarized and compared regarding the repairing techniques and fire intensity levels. The complied results have shown that recovering the ultimate strength is achievable but the stiffness recovery is difficult. Moreover, the current fire loading scenarios adopted in the post-fire repair research are mostly idealized as constant heating rates or standard fire curves, which may have produced unrealistic fire damage patterns and the associated repairing techniques may be not practical. For future studies, the realistic fire impact and the system-level structural damage investigation are necessary.
KW - Concrete structures
KW - Fire loading
KW - Post-fire performance
KW - Post-fire repair
KW - Structural performance
UR - http://www.scopus.com/inward/record.url?scp=85125400461&partnerID=8YFLogxK
U2 - 10.21022/IJHRB.2021.10.4.323
DO - 10.21022/IJHRB.2021.10.4.323
M3 - Journal article
AN - SCOPUS:85125400461
SN - 2234-7224
VL - 10
SP - 323
EP - 334
JO - International Journal of High-Rise Buildings
JF - International Journal of High-Rise Buildings
IS - 4
ER -