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首页> 外文期刊>Composite Structures >The effect of Tube-in-Tube buckling-restrained device on performance of hybrid PFRP-Aluminium space truss structure
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The effect of Tube-in-Tube buckling-restrained device on performance of hybrid PFRP-Aluminium space truss structure

机译：管内屈曲抑制装置对杂交PFRP铝空间桁架结构性能的影响

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摘要

Due to low elastic modulus, overall buckling of slender pultruded fiber reinforced polymer (PFRP) strut is prone to occur. Hence, the Tube-in-Tube buckling restrained device (TTBRD) for PFRP tube was firstly proposed and detailly introduced. The structural effect of TTBRD was examined by compressive tests on hybrid PFRP space truss girder with and without TTBRDs. The results demonstrate that the structural bearing capacity and ductility have been greatly improved. To implement accurate structural calculation, preliminary finite element (FE) analyses were conducted at the component level. A single PFRP tube with TTBRD was separately modelled by three kinds of FE models, which adopt the concept of "surface-to-surface", "line-to-surface" and "line-to-line" contact, respectively. The difference of the three kinds of FE models was compared and analysed. The appropriate FE models have been selected, and the behaviour of PFRP girder can then be well simulated. To further explore possible application, the verified FE model was used to simulate a large-scale 5 x 5 square on-square space truss structure with different numbers of TTBRDs. It was demonstrated that the structural progressive buckling can be effectively prevented. Additionally, the TTBRD provides a good way for structural health monitoring of PFRP space truss structures.
机译：由于低弹性模量，倾向于发生细长覆膜纤维增强聚合物（PFRP）支柱的总屈曲。因此，首先提出并详述了PFRP管的管内屈曲抑制装置（TTBRD）并详述。通过杂交PFRP空间桁架桁架的压缩试验检查TTBRD的结构效果，没有TTBRD。结果表明，结构承载力和延展性大大提高。为了实现精确的结构计算，在组分水平下进行初步有限元（Fe）分析。具有TTBRD的单个PFRP管由三种FE模型进行单独建模，其采用“面对面”，“线到表面”和“线到线”接触的概念。比较和分析了三种Fe模型的差异。已经选择了合适的Fe模型，然后可以很好地模拟PFRP梁的行为。为了进一步探索可能的应用，已验证的FE模型用于模拟具有不同数量的TTBRD的大型5 x 5平方线上空间桁架结构。据证明，可以有效地防止结构进步屈曲。此外，TTBRD为PFRP空间桁架结构的结构健康监测提供了一种很好的方法。

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