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<p>Subsea oil and gas facilities in specific regions are affected by sand dune accumulation loads, requiring fully enclosed protective structures to ensure integrity. Steel protective structures are limited by their weight. Glass Fiber Reinforced Polymer (GFRP) offers a compelling alternative due to its low weight, high strength, and corrosion resistance. This study investigates the damage effects on GFRP protective structures caused by sand dune accumulation and hydrostatic pressure. The Puck criterion was used to predict matrix and fiber failure, while progressive damage analysis, implemented through the ABAQUS USDFLD subroutine, was employed to track damage evolution. The Finite Element Analysis (FEA) predicted flexural strength (756.34&#xa0;MPa) closely matched experimental results (702.76&#xa0;MPa), with a 7.62% error, confirming model accuracy. Under sand dune loads, hat-shaped stiffeners greatly improved stability. For stiffened structures, displacement increased from 77.25&#xa0;mm to 556.01&#xa0;mm as sand height rose from 4&#xa0;m to 10&#xa0;m. Damage progressed from matrix tensile failure at lower heights to matrix compression and fiber damage at higher loads. At a 400&#xa0;m water depth (4&#xa0;MPa), the hat-shaped stiffeners exhibited matrix tensile damage with a displacement of 12.85&#xa0;mm. Doubling the bottom panel thickness reduced displacement by 60.17% to 5.12&#xa0;mm.</p>

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Damage Analysis of Subsea GFRP Structures Under Sand Dune Accumulation Load

  • 期刊论文

  • 发表日期：

    2025年11月15日

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  • Zhao Wang,
  • Di-Yi Chen

摘要

Subsea oil and gas facilities in specific regions are affected by sand dune accumulation loads, requiring fully enclosed protective structures to ensure integrity. Steel protective structures are limited by their weight. Glass Fiber Reinforced Polymer (GFRP) offers a compelling alternative due to its low weight, high strength, and corrosion resistance. This study investigates the damage effects on GFRP protective structures caused by sand dune accumulation and hydrostatic pressure. The Puck criterion was used to predict matrix and fiber failure, while progressive damage analysis, implemented through the ABAQUS USDFLD subroutine, was employed to track damage evolution. The Finite Element Analysis (FEA) predicted flexural strength (756.34 MPa) closely matched experimental results (702.76 MPa), with a 7.62% error, confirming model accuracy. Under sand dune loads, hat-shaped stiffeners greatly improved stability. For stiffened structures, displacement increased from 77.25 mm to 556.01 mm as sand height rose from 4 m to 10 m. Damage progressed from matrix tensile failure at lower heights to matrix compression and fiber damage at higher loads. At a 400 m water depth (4 MPa), the hat-shaped stiffeners exhibited matrix tensile damage with a displacement of 12.85 mm. Doubling the bottom panel thickness reduced displacement by 60.17% to 5.12 mm.