TY - JOUR
T1 - A new damage factor for seismic assessment of deficient bare and FRP-retrofitted RC structures
AU - Markou, George
AU - Garcia, R.
AU - Mourlas, Christos
AU - Guadagnini, Maurizio
AU - Pilakoutas, Kypros
AU - Papadrakakis, Manolis
N1 - Copyright:
© 2021 Elsevier Ltd. All rights reserved.
PY - 2021/12/1
Y1 - 2021/12/1
N2 - The seismic assessment of reinforced concrete (RC) structures before and after retrofitting is a challenging task, mainly because existing numerical tools cannot accurately model the evolution of concrete damage. This article proposes an innovative numerical method suitable to model and assess the ultimate carrying capacity of RC structures. The modelling approach proposes a steel constitutive material model with a damage factor that accounts for accumulated damage within the surrounding concrete domain, which effectively captures bar slippage. The proposed method is validated with experimental results from full-scale cyclic tests on deficient bare and CFRP-retrofitted RC joints tested previously by the authors. The results indicate that the proposed simulation method captures the extreme nonlinearities observed in the tested RC joints, with acceptable accuracy and computational robustness. The results of this study are expected to contribute towards the development of more reliable numerical tools and design guidelines for efficient seismic assessment of RC structures before and after earthquakes.
AB - The seismic assessment of reinforced concrete (RC) structures before and after retrofitting is a challenging task, mainly because existing numerical tools cannot accurately model the evolution of concrete damage. This article proposes an innovative numerical method suitable to model and assess the ultimate carrying capacity of RC structures. The modelling approach proposes a steel constitutive material model with a damage factor that accounts for accumulated damage within the surrounding concrete domain, which effectively captures bar slippage. The proposed method is validated with experimental results from full-scale cyclic tests on deficient bare and CFRP-retrofitted RC joints tested previously by the authors. The results indicate that the proposed simulation method captures the extreme nonlinearities observed in the tested RC joints, with acceptable accuracy and computational robustness. The results of this study are expected to contribute towards the development of more reliable numerical tools and design guidelines for efficient seismic assessment of RC structures before and after earthquakes.
KW - Beam-column RC joints
KW - Finite element modelling
KW - FRP strengthening
KW - Bar slippage
KW - Cyclic nonlinear analysis
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85115742559&partnerID=MN8TOARS
U2 - 10.1016/j.engstruct.2021.113152
DO - 10.1016/j.engstruct.2021.113152
M3 - Article
SN - 0141-0296
VL - 248
JO - Engineering Structures
JF - Engineering Structures
M1 - 113152
ER -