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Lateral torsional buckling and section distortion of pultruded GFRP I-sections subject to flexure

机译：横向扭转弯曲和剖腹产GFRP I-部分的剖反弯曲弯曲

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摘要

Lateral torsional buckling (LTB) and local section distortion of pultruded glass fiber reinforced polymer (GFRP) I-sections subject to flexure are investigated. LTB behavior will dominate longitudinally slender beams having low flange slenderness. However, as the flange becomes more slender and/or the beam shorter, the effects of local section distortion (LSD) become significant, reducing the LTB capacity of the member. Using the energy method, an analytical study was conducted and explicit equations for predicting the critical LTB buckling moments of GFRP I-sections accounting for the effects of LSD are proposed. The proposed LTB equation was validated using experimental results and finite element analysis. Excellent agreement was observed between the proposed LTB equation and experimental results for sections expected to be dominated by LTB behavior. Extending the study using the same approach, an equation predicting LTB capacity as it is affected by LSD was also validated using experimental results. It is found that the proposed LTB equation captures the capacity reduction due to LSD and therefore, provides more accurate predictions for sections expected to be dominated by LSD behavior; those having small slenderness ratios and large flange slenderness ratios.
机译：研究了横向扭转屈曲（LTB）和脉冲玻璃纤维增​​强聚合物（GFRP）I段的局部截面变形，受弯曲的影响。 LTB行为将主导具有低法兰细长的纵向细长的梁。然而，由于凸缘变得更加细长和/或梁较短，因此局部截面失真（LSD）的效果变得显着，降低了构件的LTB容量。使用能量法，进行了分析研究，并进行了明确方程，用于预测GFRP I部分的临界LTB屈曲时刻提出了LSD的影响。使用实验结果和有限元分析验证所提出的LTB方程。在所提出的LTB方程和实验结果之间观察到良好的一致性，并且预期由LTB行为支配的部分。使用相同的方法扩展研究，使用实验结果验证了预测LSD影响的LTB容量的等式。结果发现，所提出的LTB方程捕获由于LSD引起的容量减少，因此，为预期由LSD行为主导的部分提供更准确的预测;那些具有小细长比率和大法兰细长比率的那些。

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