Stone prism encased concrete-filled steel tube columns subjected to axial compression
Stone prism encased concrete-filled steel tube columns subjected to axial compression
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受轴压作用的石棱柱钢管混凝土柱
DOI：
10.1016/j.istruc.2021.05.058
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发表时间：
2021
期刊：
影响因子：
4.1
通讯作者：
Rachel Chicchi
中科院分区：
文献类型：
--
作者：
叶勇;刘阳;郭子雄;Rachel Chicchi
提出了一种新型的钢管混凝土结构构件，即用石棱柱体代替钢管混凝土的中心部分。通过试验研究了石棱柱形外包钢管混凝土轴压构件的受力性能。共有24根短柱（包括18个SCFST试件和6个CFST试件）承受轴向压缩直至发生破坏。考虑的主要参数是石棱柱的尺寸（s= 75 mm、100 mm或125 mm）、钢管的壁厚（t= 6.0 mm、8.0 mm或12.0 mm）和混凝土强度（fcu= 62.3 MPa或107.0 MPa）。试验结果表明，构件的三个部分之间的复合作用，这显着提高了SCFST柱的承载能力。研究了参数对SCFST试件的破坏机理、承载力、荷载-变形响应和延性的影响。同时，每个SCFST试件的轴压强度的实验得到的预测强度进行了比较，通过采用目前可用的常规钢管混凝土柱的设计规范的公式。这些设计规范不能准确预测钢管混凝土短柱的承载力，并提出了一个改进的模型。
A new type of concrete-filled steel tube (CFST) structural member is proposed by replacing the central portion of the infilled concrete with a stone prism. The mechanical behavior of the stone prism encased concrete-filled steel tube (SCFST) members under axial compression was studied through experimental testing. A total of twenty-four stub columns, including eighteen SCFST specimens and six CFST specimens, were subjected to axial compression until failure occurred. The primary parameters considered were the size of the stone prism (s= 75 mm, 100 mm or 125 mm), wall-thickness of the steel tube (t= 6.0 mm, 8.0 mm or 12.0 mm), and concrete strength (fcu= 62.3 MPa or 107.0 MPa). Test results demonstrated the composite actions between the three parts of the member, which significantly enhanced the load-carrying capacity of the SCFST column. The effect of the parameters on the failure mechanism, load-carrying capacity, load versus deformation response, and ductility of the SCFST specimens was researched. Meanwhile, the experimentally obtained axial compressive strength of each SCFST specimen was compared with predicted strengths obtained by adopting the formulae from currently available design codes for conventional CFST columns. These design codes could not precisely predict the load-carrying capacity of SCFST stub columns, and an improved model was proposed.