当前位置: X-MOL 学术Structures › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Mechanical behavior of self-stressing Steel Slag Aggregate Concrete Filled Steel Tubular short columns with different loading modes
Structures ( IF 4.1 ) Pub Date : 2020-05-22 , DOI: 10.1016/j.istruc.2020.05.015
Feng Yu , Yue Cao , Yuan Fang , Yang Zhang , Kang Niu

This paper presents an experimental investigation on the mechanical behaviour of the Self-stressing Steel Slag Aggregate Concrete Filled Steel Tubular (SSSACFST) short columns under axial compression. Ten SSSACFST short columns with different diameter-thickness ratios and expansion rates of Steel Slag Aggregate Concrete (SSAC) are designed, and three different axial compression tests are conducted including the load applied to the core SSAC (type-A loading), load applied to the outer steel tube (type-B loading), and load applied to the steel tube and core SSAC simultaneously (type-C loading). The experimental results show that all SSSACFST short columns subjected to axial load exhibit drum-like failures. The Incremental Range of Load Capacity (IRLC) and the ultimate axial and circumferential strains of the specimens will be improved by increasing the expansion rate. The effect of the loading mode on the ultimate bearing capacity is not very evident, while the influence of the loading mode on the strains is remarkable. The ultimate axial and circumference strains of the specimens with type-B loading mode are significantly larger than those of the specimens with type-A loading mode or type-C loading mode. The increase in the diameter-thickness ratio decreases the ultimate bearing capacity and ultimate axial and circumferential strains of the specimens. According to the experimental results, the adaptability of the existing CFST design codes for estimating the strength of SSSACFST short columns is examined. Additionally, a model for predicting the ultimate bearing capacity of SSSACFST short columns with the type-C loading mode is proposed depending on the limit equilibrium theory. On this basis, the calculation methods of the bearing capacity of the SSSACFST short columns under axial compression with the other two loading modes are suggested. The results predicted by the proposed models are in good agreement with the test data.



中文翻译:

不同加载方式下自应力钢渣骨料混凝土钢管短柱的力学性能

本文介绍了自应力钢渣骨料混凝土短管柱在轴向压缩下的力学行为的实验研究。设计了10根不同直径-厚度比和钢渣骨料混凝土(SSAC)膨胀率的SSSACFST短柱,并进行了三种不同的轴向压缩试验,包括施加在核心SSAC上的载荷(A型载荷),外钢管(B型载荷),同时施加在钢管和芯SSAC上的载荷(C型载荷)。实验结果表明,所有承受轴向载荷的SSSACFST短柱均表现出鼓状破坏。通过增加膨胀率,可以改善试样的承载能力增量范围(IRLC)以及最终的轴向和圆周应变。加载模式对极限承载力的影响不是很明显,而加载模式对应变的影响却很明显。B型加载模式的样品的极限轴向应变和周向应变明显大于A型加载模式或C型加载模式的样本。直径-厚度比的增加降低了样品的极限承载力以及极限轴向和圆周应变。根据实验结果,检查了现有CFST设计规范对SSSACFST短柱强度的适应性。另外,根据极限平衡理论,提出了一种利用C型加载模式预测SSSACFST短柱极限承载力的模型。在此基础上,提出了SSSACFST短柱在其他两种加载方式下轴向受压承载力的计算方法。所提出的模型预测的结果与测试数据非常吻合。

更新日期:2020-05-22
down
wechat
bug