TY - JOUR
T1 - A physics-informed and data-enhanced tensile stress-strain model for UHPFRC
AU - Liu, Wei He
AU - Zhang, Lu Wen
AU - Dai, Jian Guo
N1 - Funding Information:
The authors acknowledge the supports provided by Chinese Guangdong Province R&D Plan for Key Areas (No. 2019B111107002), Hong Kong General Research Fund (RGC) (No. 15214517) and the Hong Kong Innovation and Technology Fund (No. ITS/077/18FX). Weihe Liu acknowledges the support by The Hong Kong Polytechnic University through the Research Institute for Land and Space (No. 1-CD7D).
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/6/15
Y1 - 2023/6/15
N2 - Despite the rapid developments in fundamental investigations and engineering applications of ultra-high-performance fiber reinforced concrete (UHPFRC), there is still lacking of a reliable tensile stress-strain model for UHPFRC in design guidelines. A generalized tensile stress-strain model for UHPFRC was developed for the first time. Through properly identifying unified model parameters, widely acknowledged experimental results were successfully reproduced by using a one-dimensional finite element model (FEM). A rich database was generated and granted with physics by the FEM model. Physical-consistent strength, ultimate strain and stress-strain models of UHPFRC were proposed, trained by model-generated data, and enhanced by experimental data. The proposed strength model and ultimate strain model predicted extensive experimental results with reasonable accuracy, giving mean absolute percentage errors (MAPE) of 12% and 25.3%, respectively. The established stress-strain model also predicted satisfactorily the full-range stress-strain curves tested by different research groups. It was evidenced that higher mean matrix cracking strength leads to higher ultimate strengths, less cracks, higher crack widths of UHPFRC at the ultimate state. This was elaborated for the first time, as caused by the dual action of snubbing effects and multi-crack interactions.
AB - Despite the rapid developments in fundamental investigations and engineering applications of ultra-high-performance fiber reinforced concrete (UHPFRC), there is still lacking of a reliable tensile stress-strain model for UHPFRC in design guidelines. A generalized tensile stress-strain model for UHPFRC was developed for the first time. Through properly identifying unified model parameters, widely acknowledged experimental results were successfully reproduced by using a one-dimensional finite element model (FEM). A rich database was generated and granted with physics by the FEM model. Physical-consistent strength, ultimate strain and stress-strain models of UHPFRC were proposed, trained by model-generated data, and enhanced by experimental data. The proposed strength model and ultimate strain model predicted extensive experimental results with reasonable accuracy, giving mean absolute percentage errors (MAPE) of 12% and 25.3%, respectively. The established stress-strain model also predicted satisfactorily the full-range stress-strain curves tested by different research groups. It was evidenced that higher mean matrix cracking strength leads to higher ultimate strengths, less cracks, higher crack widths of UHPFRC at the ultimate state. This was elaborated for the first time, as caused by the dual action of snubbing effects and multi-crack interactions.
KW - Generalized stress-strain model
KW - Multiple crack interactions
KW - One-dimensional FEM
KW - Physics-informed data-enhanced
KW - Snubbing effect
KW - Ultra-high-performance fiber reinforced concrete
UR - http://www.scopus.com/inward/record.url?scp=85151660069&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2023.115989
DO - 10.1016/j.engstruct.2023.115989
M3 - Journal article
AN - SCOPUS:85151660069
SN - 0141-0296
VL - 285
JO - Engineering Structures
JF - Engineering Structures
M1 - 115989
ER -