TY - JOUR

T1 - Investigation on fracture behaviour of UHPFRC using a mesoscale computational framework

AU - Hai, Lu

AU - Huang, Yu Jie

AU - Wriggers, Peter

AU - Zhang, Hui

AU - Li, Qing Hua

N1 - Funding Information: This work is funded by National Natural Science Foundation of China ( 52208296 ), Fundamental Research Program of Shanxi Province ( 202203021212132 and 202203021212142 ) and “Overseas Training Program for Young Talents” of Ocean University of China . The author Peter Wriggers gratefully acknowledges support for this research by the “ German Research Foundation” (DFG) in the PRIORITY PROGRAM SPP 2020 , project WR 19/58-2 .

PY - 2024/3/1

Y1 - 2024/3/1

N2 - Ultra high performance fibre reinforced concrete (UHPFRC) demonstrates intricate failure mechanisms like fibre bending and yielding, mortar cracking, crushing and spalling, as well as fibre-mortar interfacial debonding. These are often beyond the resolutions of conventional experiments as well as homogeneous models and motivate the need for more refined models. This study develops a novel computational framework to elucidate the various mesoscale failure mechanisms of UHPFRC that can occur concurrently or consecutively. A bi-scalar damage-plasticity model (Wu-Li model) is employed to efficiently capture the failure characteristics of mortar. Nonlinear cohesive elements are inserted between fibres and mortar to explicitly simulate the interfacial bonding and debonding behaviour. The UHPFRC models are validated by pullout tests of single steel fibres with different inclination angles and direct tensile tests of UHPFRC samples with many oriented/un-oriented fibres. Afterwards, this work conducts comprehensive parametric analyses to quantify the influences of key material and geometric properties. The developed framework holds promise to enhance the understanding of UHPFRC damage and fracture behaviour.

AB - Ultra high performance fibre reinforced concrete (UHPFRC) demonstrates intricate failure mechanisms like fibre bending and yielding, mortar cracking, crushing and spalling, as well as fibre-mortar interfacial debonding. These are often beyond the resolutions of conventional experiments as well as homogeneous models and motivate the need for more refined models. This study develops a novel computational framework to elucidate the various mesoscale failure mechanisms of UHPFRC that can occur concurrently or consecutively. A bi-scalar damage-plasticity model (Wu-Li model) is employed to efficiently capture the failure characteristics of mortar. Nonlinear cohesive elements are inserted between fibres and mortar to explicitly simulate the interfacial bonding and debonding behaviour. The UHPFRC models are validated by pullout tests of single steel fibres with different inclination angles and direct tensile tests of UHPFRC samples with many oriented/un-oriented fibres. Afterwards, this work conducts comprehensive parametric analyses to quantify the influences of key material and geometric properties. The developed framework holds promise to enhance the understanding of UHPFRC damage and fracture behaviour.

KW - Cohesive zone model

KW - Damage-plasticity model

KW - Interfacial behaviour

KW - Mesoscale damage and fracture

KW - Ultra high performance concrete

UR - http://www.scopus.com/inward/record.url?scp=85184660624&partnerID=8YFLogxK

U2 - 10.1016/j.cma.2024.116796

DO - 10.1016/j.cma.2024.116796

M3 - Article

AN - SCOPUS:85184660624

VL - 421

JO - Computer Methods in Applied Mechanics and Engineering

JF - Computer Methods in Applied Mechanics and Engineering

SN - 0045-7825

M1 - 116796

ER -