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<p>Wood has long been recognized as one of the most sustainable materials in construction, particularly in structural applications such as columns and beams. Its specific properties, including a high strength-to-weight ratio, renewability, and ease of use, have made it a favored choice across both traditional and contemporary construction techniques. Despite its advantages, timber columns are susceptible to various types of damage, especially from environmental oscillations in temperature and humidity, which can cause the wood to expand and contract, leading to cracks or structural degradation. Biological threats, such as fungal decay and infestation by wood-boring insects like termites, can further compromise the integrity of wooden columns. Additionally, poor construction practices, such as failing to follow proper standards and installation methods, often intensify these defects. Structural weakening can also occur when columns are perforated for utility installations. In recent years, there has been growing interest in using Carbon Fiber Reinforced Polymer (CFRP) to reinforce timber columns. This study investigates the effect of CFRP reinforcement on the axial load-bearing capacity of small, defective timber columns. Key factors analyzed include defect shape and the location of defects. Eight timber column specimens with varying conditions were modeled using the finite element software Abaqus, which determined their maximum axial load-bearing capacity and vertical deformation. These simulations were followed by axial loading experiments in a structural laboratory, with the results compared to the numerical models. ‏The findings indicate that CFRP reinforcement significantly enhances axial load capacity while reducing vertical displacement. Among the specimens, those with rectangular defects showed the greatest improvement in load-bearing capacity after reinforcement, while columns with circular defects exhibited the lowest performance. CFRP fibers effectively absorbed and redistributed stresses in weakened areas, thereby delaying premature structural failure. Significantly, columns with cracks experienced a 35% increase in load-bearing capacity following CFRP reinforcement.</p>

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Determining axial load capacity in short timber columns with defects retrofitted using carbon fiber-reinforced polymer

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Mehdi Shahraki,
  • Arezoo Mir,
  • Razyeh Moghimi,
  • Narges Pir Arjouni

摘要

Wood has long been recognized as one of the most sustainable materials in construction, particularly in structural applications such as columns and beams. Its specific properties, including a high strength-to-weight ratio, renewability, and ease of use, have made it a favored choice across both traditional and contemporary construction techniques. Despite its advantages, timber columns are susceptible to various types of damage, especially from environmental oscillations in temperature and humidity, which can cause the wood to expand and contract, leading to cracks or structural degradation. Biological threats, such as fungal decay and infestation by wood-boring insects like termites, can further compromise the integrity of wooden columns. Additionally, poor construction practices, such as failing to follow proper standards and installation methods, often intensify these defects. Structural weakening can also occur when columns are perforated for utility installations. In recent years, there has been growing interest in using Carbon Fiber Reinforced Polymer (CFRP) to reinforce timber columns. This study investigates the effect of CFRP reinforcement on the axial load-bearing capacity of small, defective timber columns. Key factors analyzed include defect shape and the location of defects. Eight timber column specimens with varying conditions were modeled using the finite element software Abaqus, which determined their maximum axial load-bearing capacity and vertical deformation. These simulations were followed by axial loading experiments in a structural laboratory, with the results compared to the numerical models. ‏The findings indicate that CFRP reinforcement significantly enhances axial load capacity while reducing vertical displacement. Among the specimens, those with rectangular defects showed the greatest improvement in load-bearing capacity after reinforcement, while columns with circular defects exhibited the lowest performance. CFRP fibers effectively absorbed and redistributed stresses in weakened areas, thereby delaying premature structural failure. Significantly, columns with cracks experienced a 35% increase in load-bearing capacity following CFRP reinforcement.