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<p>Crack initiation and brittle fracture in marine concrete critically affect the safety and service life of ocean infrastructure (e.g., sea-crossing bridge piers, offshore platforms, floating reinforced concrete breakwaters, LNG terminals), as stress concentrations at geometric discontinuities such as notches introduce critical vulnerabilities that can trigger premature cracking and unpredictable failure modes. This study investigates the fracture behavior of double-notched marine concrete beams through an integrated experimental and peridynamic (PD) approach. Experimentally, three-point bending tests were conducted on specimens with varied notch geometries—including notch angle, position, and notch-to-height ratio—to quantify crack propagation and load-bearing capacity. Results revealed that notch configuration exerts significant control over both fracture paths and ultimate strength. Computationally, a novel uni-bond dual-parameter PD-Finite Element Method (FEM) (UDPD-FEM) adaptive coupling model was developed to overcome fixed Poisson’s ratio constraints and substantially enhance computational efficiency—achieving at least a 50% performance gain compared with pure uni-bond dual-parameter PD (UDPD) simulations—while preserving autonomous crack branching capability. Simulations exhibited excellent agreement with experimental load responses and fracture trajectories, successfully visualizing phenomena inaccessible to physical measurement, such as displacement fields and force density distributions. This work establishes a robust, experimentally validated framework for analyzing fracture in marine concrete and provides actionable design principles for optimizing notch geometry in crack-prone marine structural components.</p>

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Study on Brittle Failure of Double-Notched Marine Concrete Based on Experiment and Peridynamic Simulation

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Shuang Li,
  • Xin-yu Gao,
  • Yin-zhi Zhao,
  • Yong-jun Lu,
  • Xiao-hua Huang

摘要

Crack initiation and brittle fracture in marine concrete critically affect the safety and service life of ocean infrastructure (e.g., sea-crossing bridge piers, offshore platforms, floating reinforced concrete breakwaters, LNG terminals), as stress concentrations at geometric discontinuities such as notches introduce critical vulnerabilities that can trigger premature cracking and unpredictable failure modes. This study investigates the fracture behavior of double-notched marine concrete beams through an integrated experimental and peridynamic (PD) approach. Experimentally, three-point bending tests were conducted on specimens with varied notch geometries—including notch angle, position, and notch-to-height ratio—to quantify crack propagation and load-bearing capacity. Results revealed that notch configuration exerts significant control over both fracture paths and ultimate strength. Computationally, a novel uni-bond dual-parameter PD-Finite Element Method (FEM) (UDPD-FEM) adaptive coupling model was developed to overcome fixed Poisson’s ratio constraints and substantially enhance computational efficiency—achieving at least a 50% performance gain compared with pure uni-bond dual-parameter PD (UDPD) simulations—while preserving autonomous crack branching capability. Simulations exhibited excellent agreement with experimental load responses and fracture trajectories, successfully visualizing phenomena inaccessible to physical measurement, such as displacement fields and force density distributions. This work establishes a robust, experimentally validated framework for analyzing fracture in marine concrete and provides actionable design principles for optimizing notch geometry in crack-prone marine structural components.