This paper reports on the flexural performance of an innovative composite grid panel composed of glass fiber-reinforced polymer face skins and deep glass fiber-reinforced polymer ribs with a trapezoidal cross-section. Three-point and four-point bending experiments were performed to demonstrate the feasibility of the composite grid panels under concentrated loads. Compared with the composite grid panels without skins, maximum increases in the ultimate load, and initial bending stiffness of the composite grid panels of approximately 68.2% and 306.7%, respectively, were achieved with the existence of both upper and lower skins. Furthermore, an analytical analysis was carried out to predict the initial bending stiffness and mid-span deflection of the composite grid panels. A comparison of the analytical and experimental results showed that the analytical model accurately predicted the flexural performance of the composite grid panels subjected to three-point and four-point bending. Failure mechanism maps were constructed to predict the mechanical response and failure modes of the composite grid panels. Moreover, the validated model was used in a parametric analytical study to further estimate the effects of various parameters on the flexural performance of the composite grid panels. The results demonstrated that the initial bending stiffness can be significantly improved by increasing the trapezoidal section ratio, face skin thickness, and grid height.

中文翻译：

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深筋复合格栅板的抗弯性能

本文报告了由玻璃纤维增​​强聚合物面皮和梯形横截面深玻璃纤维增​​强聚合物肋组成的创新复合网格面板的弯曲性能。进行了三点和四点弯曲实验，以证明复合网格板在集中载荷下的可行性。与没有蒙皮的复合网格板相比，在同时存在上下蒙皮的情况下，复合网格板的极限载荷和初始弯曲刚度分别增加了约 68.2% 和 306.7%。此外，还进行了分析分析以预测复合网格板的初始弯曲刚度和跨中挠度。分析和实验结果的比较表明，分析模型准确地预测了复合网格板在三点和四点弯曲下的弯曲性能。构建失效机制图以预测复合网格板的机械响应和失效模式。此外，经过验证的模型用于参数分析研究，以进一步估计各种参数对复合网格板弯曲性能的影响。结果表明，通过增加梯形截面比、面蒙皮厚度和网格高度可以显着提高初始弯曲刚度。构建失效机制图以预测复合网格板的机械响应和失效模式。此外，经过验证的模型用于参数分析研究，以进一步估计各种参数对复合网格板弯曲性能的影响。结果表明，通过增加梯形截面比、面蒙皮厚度和网格高度可以显着提高初始弯曲刚度。构建失效机制图以预测复合网格板的机械响应和失效模式。此外，经过验证的模型用于参数分析研究，以进一步估计各种参数对复合网格板弯曲性能的影响。结果表明，通过增加梯形截面比、面蒙皮厚度和网格高度可以显着提高初始弯曲刚度。