Novel hybrid FRP tubular columns with large deformation capacity: Concept and behaviour
Novel hybrid FRP tubular columns with large deformation capacity: Concept and behaviour
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DOI：
10.1016/j.compstruct.2019.01.055
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发表时间：
2019-01
影响因子：
6.3
通讯作者：
Tao Yu;Hongchao Zhao;T. Ren;A. Remennikov
中科院分区：
文献类型：
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作者：
Tao Yu;Hongchao Zhao;T. Ren;A. Remennikov
已经进行了广泛的研究，使用纤维增强聚合物（FRP）作为约束材料的混合管柱的民用建筑，柱的设计往往是由刚度和/或强度要求控制。相比之下，承受大变形而不失去结构完整性的能力在某些应用中可能是至关重要的，例如地下矿山的直立支架。本文提出了一种新的大变形能力柱形式的概念发展。该新型柱由外部FRP管和由粗块/骨料制成的填充物组成，所述粗块/骨料可以来自煤废弃物或其他废物/回收材料，以及具有高含水量的硫铝酸钙（CSA）基胶凝材料。除了具有大变形能力外，新柱还可以广泛、直接和轻松地使用废弃材料，并且无需现场搅拌混凝土或运输商品混凝土。本文还介绍了新柱和两种类似柱形式的一系列受压试验结果。这些测试表明，新的列非常大的变形能力，并表明，现有的FRP约束正常混凝土的应力-应变模型可以用来提供合理的预测行为的约束填充材料在新的列。最后讨论了该柱的应用前景和今后的研究方向。
Extensive studies have been conducted on the use of fibre-reinforced polymer (FRP) as a confining material in hybrid tubular columns for civil construction, where the design of columns is often controlled by the stiffness and/or strength requirements. By contrast, the capacity of sustaining large deformation without losing structural integrity can be critical in some applications such as the standing supports for underground mines. This paper presents the conceptual development of a novel column form with large deformation capacity. The novel column consists of an outer FRP tube, and an infill made of coarse lumps/aggregates, which can be from coal rejects or other waste/recycled materials, as well as calcium sulfoaluminate (CSA)-based cementitious material with high water content. In addition to its large deformation capacity, the new column allows the extensive, direct and easy use of waste materials and eliminates the need for mixing concrete on site or transporting commercial concrete. This paper also presents the results from a series of compression tests on the new columns as well as two similar column forms. These tests demonstrate the very large deformation capacity of the new column and show that an existing stress-strain model for FRP-confined normal concrete can be used to provide reasonable predictions of the behaviour of the confined infill material in the new column. The potential applications of the new column and the needs for future research are also discussed.