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Exterior beam-to-column bolted connections between GFRP I-shaped pultruded profiles using stainless steel cleats, Part 2: Prediction of initial stiffness and strength
Thin-Walled Structures ( IF 6.4 ) Pub Date : 2021-04-27 , DOI: 10.1016/j.tws.2021.107762
David Martins , José Gonilha , João R. Correia , Nuno Silvestre

The present work focuses on the prediction of initial stiffness and strength of bolted beam-to-column connections between pultruded glass fibre reinforced polymer (GFRP) profiles using stainless steel cleats — the first part (Martins et al., 2021) of this two-part paper presented an experimental study on the monotonic and cyclic behaviour of beam-to-column connections, while this second part focuses only on the monotonic behaviour of the reinforced connections. The initial stiffness was predicted using both analytical – via an adapted “component method” – and numerical models. The stiffness predictions compared well with experimental results. This study also identified the components with the highest influence on the connections’ stiffness, namely (i) the bending of the flange cleats and (ii) the transverse compression and shear of the columns’ webs. The strength of the reinforced connection series was predicted using a mixed analytical–numerical approach, as the local failure strengths were calculated in accordance with design standard recommendations, while the load distribution per connection component was computed through finite element (FE) models. The predicted failure modes and corresponding ultimate loads were in good agreement with the experimental tests. The proposed analytical and numerical models proved to be a viable tool for the design of GFRP structures, providing accurate predictions of the initial stiffness and strength of cleated connections.



中文翻译:

使用不锈钢夹板的GFRP I形拉挤型材之间的外部梁到柱螺栓连接,第2部分:初始刚度和强度的预测

本工作着重于使用不锈钢防滑钉预测拉挤玻璃纤维增​​强聚合物(GFRP)型材之间的梁与柱之间的螺栓连接的初始刚度和强度-这两个部分的第一部分(Martins等人,2021年)论文的一部分对梁-柱连接的单调性和循环特性进行了实验研究,而第二部分仅关注钢筋连接的单调性。初始刚度是通过分析(通过改进的“分量法”)和数值模型来预测的。刚度的预测与实验结果进行了很好的比较。这项研究还确定了对连接刚度影响最大的组件,即(i)法兰夹板的弯曲和(ii)立柱腹板的横向压缩和剪切。增强连接系列的强度是使用混合分析-数值方法进行预测的,因为局部破坏强度是根据设计标准建议计算的,而每个连接组件的载荷分布是通过有限元(FE)模型计算的。预测的失效模式和相应的极限载荷与实验测试吻合良好。所提出的分析模型和数值模型被证明是设计GFRP结构的可行工具,可提供对锁紧连接的初始刚度和强度的准确预测。因为根据设计标准建议计算了局部破坏强度,而通过有限元(FE)模型计算了每个连接组件的载荷分布。预测的失效模式和相应的极限载荷与实验测试吻合良好。所提出的分析模型和数值模型被证明是设计GFRP结构的可行工具,可提供对锁紧连接的初始刚度和强度的准确预测。因为根据设计标准建议计算了局部破坏强度,而通过有限元(FE)模型计算了每个连接组件的载荷分布。预测的失效模式和相应的极限载荷与实验测试吻合良好。所提出的分析模型和数值模型被证明是设计GFRP结构的可行工具,可提供对锁紧连接的初始刚度和强度的准确预测。

更新日期:2021-04-28
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