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<p>Laminated veneer lumber exhibits limited tensile resistance in the tension zone under bending loads; therefore, reinforcing this region is essential. This study investigated the bending performance of Paulownia laminated veneer lumber (LVL) beams strengthened with glass fiber–reinforced polymer (GFRP) and carbon fiber–reinforced polymer (CFRP) sheets. The test specimens measured 32&#xa0;cm × 2&#xa0;cm × 1.4&#xa0;cm in length, width, and thickness, respectively. The results showed that the highest densities, 0.64 and 0.65&#xa0;g/cm<sup>3</sup>, were obtained for LVLs reinforced with six layers of GFRP and CFRP, respectively. Both solid Paulownia wood and Paulownia LVL (P-LVL) exhibited lower MOE and MOR values than LVLs reinforced with CFRP and GFRP. Although CFRP-reinforced LVLs showed slightly higher MOE and MOR than those reinforced with GFRP, the difference was not statistically significant at the 95% confidence level. The shear strength of the glue line in GFRP- and CFRP-reinforced LVLs was significantly higher than that of non-reinforced LVLs, with a statistically significant difference at the 95% confidence level. Moreover, increasing the number of FRP layers reduced thickness swelling and water absorption in the LVL lumber.</p>

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Improvement of structural performances of paulownia laminate veneer lumber (LVL) beams by CFRP and GFRP sheets

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Mohammad Arabi,
  • Moharam Hazrati,
  • Akbar Rostampour-Haftkhani

摘要

Laminated veneer lumber exhibits limited tensile resistance in the tension zone under bending loads; therefore, reinforcing this region is essential. This study investigated the bending performance of Paulownia laminated veneer lumber (LVL) beams strengthened with glass fiber–reinforced polymer (GFRP) and carbon fiber–reinforced polymer (CFRP) sheets. The test specimens measured 32 cm × 2 cm × 1.4 cm in length, width, and thickness, respectively. The results showed that the highest densities, 0.64 and 0.65 g/cm3, were obtained for LVLs reinforced with six layers of GFRP and CFRP, respectively. Both solid Paulownia wood and Paulownia LVL (P-LVL) exhibited lower MOE and MOR values than LVLs reinforced with CFRP and GFRP. Although CFRP-reinforced LVLs showed slightly higher MOE and MOR than those reinforced with GFRP, the difference was not statistically significant at the 95% confidence level. The shear strength of the glue line in GFRP- and CFRP-reinforced LVLs was significantly higher than that of non-reinforced LVLs, with a statistically significant difference at the 95% confidence level. Moreover, increasing the number of FRP layers reduced thickness swelling and water absorption in the LVL lumber.